CN114530060A - Five-channel DME tuning method and system suitable for large civil aircraft - Google Patents

Abstract

The invention discloses a five-channel DME tuning method suitable for a large civil aircraft, which determines the current channel selection state through an acquired tuning command, executes an automatic tuning algorithm according to the current channel selection state and the adjacent last channel selection state, determines tuning targets of five tuning channels on left and right airborne distance meters in airborne equipment, and completes tuning of the DMEs of the two five channels, so that the airborne equipment can select an optimal navigation station for receiving information in real time, and simultaneously can also consider the flight program requirements and the tuning command of a pilot, thereby realizing the communication work in order of coordination.

Description

A five-channel DME tuning method and system suitable for large civil aircraft

technical field

The invention relates to the technical field of aviation communication, in particular to a five-channel DME tuning method and system suitable for large civil aviation aircraft.

Background technique

The flight management system (FMS) is the core subsystem of the avionics system of today's large civil aircraft, and is the basis for supporting performance-based navigation (PBN) operations. The integrated navigation function of FMS includes radio navigation and inertial navigation. Radio navigation uses airborne equipment such as onboard rangefinder (DME), very high frequency omnidirectional beacon (VOR) and instrument landing system (ILS) to receive and process. The radio frequency signal emitted by the ground navigation station realizes the positioning of the aircraft. DME equipment is used to provide the distance of the aircraft relative to the navigation station and is an important measurement source for navigation. At present, the advanced mainstream civil aviation trunk lines abroad are equipped with two DME devices, each of which is a five-channel device, which can simultaneously provide distance information relative to five ground stations. Compared with the three-channel DME equipment of the feeder, the five-channel DME has more distance degrees of freedom and is better suited to the needs of performance-based navigation (PBN) operations.

During the flight of the aircraft, with the continuous change of position, the ground navigation station that cooperates with its work is also constantly switching. How to effectively perform automatic tuning control management on two five-channel DMEs, so that they can select the best navigation station for information reception in real time, and at the same time take into account the flight procedure requirements and the pilot's tuning commands to achieve coordinated and orderly work, is a Technical problems to be solved urgently.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is how to effectively perform automatic tuning control management on two five-channel DMEs, so that the optimal navigation station can be selected in real time for information reception, and at the same time, the flight procedure requirements and the pilot's tuning command must be taken into account, so as to achieve Coordinated and orderly work, therefore, the present invention provides a five-channel DME tuning suitable for large civil aircraft. It is also possible to take into account flight procedure requirements and pilot tuning commands.

The present invention is achieved through the following technical solutions:

A five-channel DME tuning method suitable for large civil aircraft, including:

Obtain a tuning command, and determine the current channel selection state according to the tuning command;

If the current channel selection state is different from the adjacent previous channel selection state, an automatic tuning algorithm is executed based on the current channel selection state, and the five airborne rangefinders on the left and right airborne rangefinders in the airborne equipment are determined according to the automatic tuning algorithm. tuning target for each tuning channel;

If the current channel selection state is the same as the adjacent last channel selection state, determine whether the time interval between the current channel selection state and the adjacent last channel selection state exceeds the preset time interval;

If the preset time interval is exceeded, the automatic tuning algorithm is executed based on the current channel selection state, and the tuning targets of the five tuning channels on the left and right airborne rangefinders in the airborne equipment are determined according to the automatic tuning algorithm; After the preset time interval, the operation is terminated.

Further, the determining the channel selection state according to the tuning command includes:

When the acquired tuning command is not any one of the manual tuning command, the program tuning command and the route tuning command, the 3+2 channel selection state is entered; wherein, the 3+2 channel selection state refers to selecting 3 navigation stations for Positioning on DME-DME and selecting 2 navigation stations for VOR-DME positioning;

When the acquired tuning command is a manual tuning command for the single-sided VHF omnidirectional beacon, the 3+1 channel selection state is entered; wherein, the 3+1 channel selection state refers to the selection of 3 navigation stations for DME-DME Locate, and select a state of the navigation station for VOR-DME positioning;

When the acquired tuning command is any one of the two-side manual tuning command, the route or procedure tuning command, the one-side manual tuning and the other-side program tuning command, and the one-side manual tuning and the other-side route tuning command, enter 3 +0 channel selection state; wherein, the 3+0 channel selection state refers to a state in which only 3 navigation stations are selected for DME-DME positioning.

Further, determining the tuning targets of five tuning channels on the left and right two airborne rangefinders in the airborne equipment according to the automatic tuning algorithm, including:

Obtain the current position of the aircraft, and query the list of candidate navigation stations based on the current position of the aircraft;

When the non-fixed attributes in the candidate navigation station list all meet the conditions, all candidate navigation stations in the candidate navigation station list are arranged according to the distance from the current position of the aircraft from far to near to form a candidate navigation station queue;

Select the navigation station to be paired from the candidate navigation station queue according to the navigation station pairing selection condition, and calculate the actual navigation performance when the navigation station to be paired locates the aircraft;

When the calculated actual navigation performance is less than the preset navigation performance, the corresponding to-be-paired navigation station and the corresponding calculated actual navigation performance are stored in the primary selection navigation station pairing list;

Select the paired navaid with the lowest actual navigation performance from the preliminary navaid pairing list as the target paired navaid (S _m , _Sn ), and determine based on the target paired navaid (S _m , _Sn ) The tuning targets for the five tuning channels on the left and right airborne rangefinders in the airborne equipment.

Further, selecting the navigation station to be paired from the candidate navigation station queue according to the navigation station pairing selection condition includes:

When the flight altitude of the aircraft is not lower than the preset flight altitude, the candidate navigation station queue is searched for the candidate navigation station S _j1 whose angle with the i-th candidate navigation station S _i1 about the aircraft satisfies the first preset angle condition , take the candidate navigation station S _i1 and the candidate navigation station S _j1 as the navigation station to be paired;

When the flight altitude of the aircraft is lower than the preset flight altitude, the candidate navigation station S _j2 whose included angle with the i-th candidate navigation station S _i2 about the aircraft satisfies the second preset angle condition is searched in the candidate navigation station queue, The candidate navigation station S _i2 and the candidate navigation station S _j2 are taken as the navigation stations to be paired.

Further, determining the tuning targets of the five tuning channels on the left and right two airborne rangefinders in the airborne equipment based on the target paired navigation stations (S _m , S _n ), including:

The two navigation stations S _m and S _n in the target paired navigation station are respectively used as the tuning targets of the first tuning channel and the second tuning channel of each airborne rangefinder in the airborne equipment;

When the flight altitude of the aircraft is not lower than the preset flight altitude, select one from the candidate navigation station queue excluding the target paired navigation station and any navigation station in the target paired navigation station with respect to the aircraft. The angle satisfies the first preset angle The candidate navigation station S _k1 of the condition is used as the tuning target of the third tuning channel of each airborne rangefinder in the airborne equipment;

When the flight altitude of the aircraft is lower than the preset flight altitude, select one from the candidate navigation station queue excluding the target paired navigation station and any navigation station in the target paired navigation station with respect to the aircraft to satisfy the second preset angle condition And the candidate navigation station S _k2 closest to the current position of the aircraft is used as the tuning target of the third tuning channel of each airborne rangefinder in the airborne equipment;

According to the current channel selection state and the current position of the aircraft, from the candidate navigation station queue excluding the tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel, select the candidate navigation station that meets the preset distance condition as the airborne The tuning target for the fourth tuning channel of each airborne rangefinder in the device;

The navigation station corresponding to the airborne range finder at the airport of the destination airport of the aircraft is used as the tuning target of the fifth tuning channel of each airborne range finder in the airborne equipment.

Further, according to the current channel selection state and the current position of the aircraft, in the candidate navigation station queue excluding the tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel, select a candidate that satisfies the preset distance condition. The navigation station serves as the tuning target for the fourth tuning channel of each airborne rangefinder in the airborne equipment, including:

When the current channel selection state is the 3+2 channel selection state, in the candidate navigation station queue excluding the tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel, select the one closest to the current position of the aircraft. The candidate navigation station is used as the tuning target of the fourth tuning channel of one of the airborne rangefinders, and the candidate navigation station with the second closest distance to the current position of the aircraft is selected as the tuning target of the fourth tuning channel of the other airborne rangefinder. ;

When the current channel selection state is the 3+1 channel selection state, in the candidate navigation station queue excluding the tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel, select the one closest to the current position of the aircraft. The candidate navigation station is used as the tuning target of the fourth tuning channel of each airborne rangefinder in the airborne equipment and its VHF omnidirectional beacon on the same side.

Further, the first preset angle condition includes: the angle with the smallest difference from 90°;

The second preset included angle condition includes: an included angle between 30° and 150°.

Further, the five-channel DME tuning method suitable for large civil aviation aircraft further includes:

Based on the current position of the aircraft, according to a preset number, obtain n VOR-DME navigation stations with a short distance as candidate navigation stations;

generating a list of candidate navigation stations based on the current position of the aircraft and attributes of the candidate navigation stations, wherein the attributes of the candidate navigation stations include fixed attributes and non-fixed attributes;

The non-fixed attributes of each candidate navigation station in the candidate navigation station list are updated in real time based on the real-time position of the aircraft.

A five-channel DME tuning system suitable for large civil aircraft, including a flight management system and two left and right airborne rangefinders, two left and right VHF omnidirectional beacons and two left and right instruments deployed in the airborne communication and navigation system landing equipment;

The flight management system, based on the above-mentioned five-channel DME tuning method suitable for large civil aircraft, performs 5 tuning channels on each airborne rangefinder, 1 tuning channel on each VHF omnidirectional beacon, and each instrument landing. The LOC tuning channel of the device is tuned;

The fourth tuning channel on the airborne range finder has the same tuning target as the tuning channel on the VHF omnidirectional beacon on the same side; the fifth tuning channel on the airborne range finder is the same as the instrument landing on the same side The tuning target for the LOC tuning channel on the device is the same.

Further, the flight management system tunes the fourth tuning channel on the airborne range finder and the tuning channel on the VHF omnidirectional beacon on the same side according to the DME/VHF working frequency pairing rules stipulated by the International Civil Aviation Organization. The target is linked and tuned, and the fifth tuning channel on the airborne rangefinder and the tuning target of the LOC tuning channel on the instrument landing equipment on the same side are linked and tuned.

The present invention provides a five-channel DME tuning method and system suitable for large-scale civil passenger aircraft. The current channel selection state is determined according to the acquired tuning command, and the automatic tuning algorithm is executed according to the current channel selection state and the adjacent previous channel selection state. , determine the tuning targets of the five tuning channels on the left and right two airborne rangefinders in the airborne equipment, and complete the tuning of the two five-channel DMEs, so that the airborne equipment can select the best navigation station for information reception in real time, and at the same time It can also take into account the flight procedure requirements and the pilot's tuning commands to achieve coordinated and orderly communication.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the embodiments of the present invention, and constitute a part of the present application, and do not constitute limitations to the embodiments of the present invention. In the attached image:

FIG. 1 is a schematic structural diagram of a tuning object in a specific embodiment of the present invention

FIG. 2 is a flow chart of a five-channel DME tuning method suitable for a large civil airliner of the present invention.

FIG. 3 is a specific flow chart in a specific embodiment of the present invention.

FIG. 4 is a specific flow chart in a specific embodiment of the present invention.

FIG. 5 is another flowchart of a five-channel DME tuning method suitable for a large civil airliner of the present invention.

FIG. 6 is a schematic diagram of a five-channel DME tuning system suitable for a large civil airliner of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. as a limitation of the present invention.

Example 1

This embodiment provides a five-channel DME tuning method suitable for large civil airliners. The schematic diagram of the tuning object structure of the tuning method is shown in Figure 1, including two left and right airborne rangefinder DMEs, and two left and right VHF omnidirectional signals. Mark the VOR and the left and right instrument landing equipment ILS, the five channels on the DME are arranged in order from top to bottom, wherein the fourth tuning channel on the DME has the same tuning target as the tuning channel on the VOR on the same side; The fifth tuning channel has the same tuning target as the localizer LOC tuning channel on the ILS on the same side.

Specifically, the first, second and third channels of the DME are automatically tuned according to the needs of the DME-DME navigation and positioning algorithm, and the corresponding channels of the two DME devices are tuned to the same frequency; the fourth channel is based on the VOR-DME navigation and positioning algorithm or flight procedure. The channel of the two DME devices can be tuned to the same frequency or to two different frequencies; the fifth channel is reserved for the destination runway of the aircraft. The operating frequency of the DME navigation station, the channel of the two DME devices is tuned to the same frequency.

As shown in FIG. 2 , this embodiment provides a five-channel DME tuning method suitable for a large civil airliner, which specifically includes the following steps:

S10: Acquire a tuning command, and determine the current channel selection state according to the tuning command.

The tuning command refers to a command sent by the flight management system FMS to the airborne navigation device for performing a tuning operation. The tuning command in this embodiment includes automatic tuning, manual tuning, route tuning and program tuning. Channel selection status refers to the status of the navigation station selected by the channels of the left and right DME devices, the left and right VOR devices, and the left and right two ILS devices in the airborne communication and navigation system, including the 3+0 channel selection status and the 3+1 channel selection status. and 3+2 channel selection state. Among them, the 3+0 station selection state refers to the state where only 3 navigation stations are selected for DME-DME positioning; the 3+1 station selection state refers to the selection of 3 navigation stations for DME-DME positioning, and the selection of one navigation station for DME-DME positioning. The state of VOR-DME positioning; the 3+2 station selection state refers to the state of selecting 3 navigation stations for DME-DME positioning, and selecting 2 navigation stations for VOR-DME positioning.

Further, automatic tuning: means that the FMS selects the navigation station that is most favorable for positioning by VOR-DME or DME-DME from the list of candidate navigation stations according to certain rules as the tuning target of the automatic tuning device or channel. This tuning method tunes channels 1, 2, and 3 of the DME device, and channel 4 of the DME device (including the same-side VOR device linked to it) that is not used for manual, en-route, and program tuning, independently of the Manual tuning, en-route tuning and program tuning run continuously. The automatic tuning method preferentially selects 3 navigation stations that are most beneficial to the DME-DME navigation mode, and designates them as the tuning targets of the 1st, 2nd and 3rd channels of the left and right DME devices in the form of two backups respectively. If there is a fourth channel that needs to be auto-tuned, after completing the above 3 channel selections for DME-DME navigation mode, continue to select 1 or 2 from the remaining candidate navigation stations (VOR equipment for auto-tuning as needed number) the nearest available navigation station to the aircraft.

Manual tuning: Refers to the crew through some way (usually in the multi-function control and display unit MCDU to enter the VOR target tuning frequency or navigation station identification code) to the VOR and the same side of the airborne rangefinder. Channel 4 of the DME is tuned to the specified navaid or operating frequency.

Program tuning: Refers to the Recommended Navaids entry in a segment entry in the ARINC 424 navigation database. When the aircraft is flying on this segment, the FMS needs to adjust the VOR and the DME equipment on the same side to the fourth The channel is tuned to the operating frequency of the proposed navigation station.

Route tuning: It means that a certain VOR-DME navigation station is used as the starting or ending point for a certain flight segment. When the aircraft is flying on this flight segment, the VOR device and the fourth channel of the DME device on the same side need to be tuned. The operating frequency of the navigation station.

The activation of the above three tuning methods of manual tuning, program tuning and en route tuning will not interrupt the execution of automatic tuning. Specifically, manual tuning, program tuning and route tuning are used to tune the fourth channel of the DME device (including the VOR device on the same side linked to it), and the specific tuning process includes:

a. If the 4th channel of the left and right DME equipment has been manually tuned, the automatic tuning, program tuning and route tuning of the 4th channel of the DME equipment need to be stopped;

b. If the manual tuning is only for the 4th channel of the DME device on one side, the 4th channel of the DME device to be tuned on the other side needs to continue to perform automatic tuning, program tuning or route tuning; if a program tuning or route tuning command is received , the fourth channel of the DME device needs to be tuned to the indicated VOR-DME navigation station; otherwise, the fourth channel of the DME device to be tuned needs to be continuously tuned automatically.

c. Under the condition that manual tuning is not enabled, if the command of program tuning or route tuning is received, the fourth channel of the two DME devices needs to be tuned to the indicated VOR-DME navigation station at the same time; otherwise, the automatic The tuning rule tunes the 4th channel of the two DME devices to two different VOR-DME navigation stations.

S20: If the current channel selection state is different from the adjacent previous channel selection state, an automatic tuning algorithm is executed based on the current channel selection state, and the five left and right airborne rangefinders in the airborne equipment are determined according to the automatic tuning algorithm. Tuning target for each tuning channel.

S30: If the current channel selection state is the same as the adjacent last channel selection state, determine whether the time interval between the current channel selection state and the adjacent last channel selection state exceeds a preset time interval (eg 30s).

S40: If the preset time interval is exceeded, execute an automatic tuning algorithm based on the current channel selection state, and determine the tuning targets of the five tuning channels on the left and right airborne rangefinders in the airborne equipment according to the automatic tuning algorithm; After the preset time interval, the operation is terminated.

Further, as shown in FIG. 2, in step S10, the channel selection state is determined according to the tuning command, which specifically includes the following steps:

S11: When the acquired tuning command is not any one of the manual tuning command, the program tuning command and the route tuning command, enter the 3+2 channel selection state. Among them, the 3+2 station selection state refers to a state in which 3 navigation stations are selected for DME-DME positioning, and 2 navigation stations are selected for VOR-DME positioning.

S12: When the acquired tuning command is a manual tuning command for the single-sided VHF omnidirectional beacon, enter the 3+1 channel selection state. Among them, the 3+1 channel selection state refers to the state of selecting three navigation stations for DME-DME positioning, and selecting one navigation station for VOR-DME positioning.

S13: When the acquired tuning command is any one of the two-side manual tuning command, the route or program tuning command, the one-side manual tuning and the other-side program tuning command, and the one-side manual tuning and the other-side route tuning command, then Enter the 3+0 channel selection state. The 3+0 station selection state refers to a state in which only 3 navigation stations are selected for DME-DME positioning.

Specifically, when the acquired tuning command is a manual tuning command, it is determined whether it is a one-sided manual tuning command; when it is a one-sided manual tuning command, it is determined whether the acquired tuning command is a route or a program tuning command; if it is a route or a program If the tuning command is used, it will enter the 3+0 channel selection state; if it is not the route and program tuning command, it will enter the 3+1 channel selection state;

When the acquired tuning command is not a one-sided manual tuning command, determine whether the acquired tuning command is an en route or program tuning command; if it is an en route or program tuning command, a tuning invalid alarm will be issued, and the 3+0 channel selection state will be entered; If it is not a route or program tuning command, it will directly enter the 3+0 channel selection state;

When the acquired tuning command is not a manual tuning command, determine whether the acquired tuning command is an en route or program tuning command; if it is an en route or program tuning command, enter the 3+0 channel selection state; if it is not an en route and program tuning command , then enter the 3+2 station selection state; wherein, the 3+2 station selection state refers to selecting 3 navigation stations as DME-DME navigation stations, and selecting 2 navigation stations as the navigation stations for VOR-DME positioning.

Further, as shown in FIG. 3 , in step S20 or step S40, the tuning targets of five tuning channels on the left and right two airborne rangefinders in the airborne equipment are determined according to the automatic tuning algorithm, which specifically includes the following steps:

S21: Obtain the current position of the aircraft, and query a list of candidate navigation stations based on the current position of the aircraft.

The candidate navigation station list refers to a list for storing the attributes of the candidate navigation stations, and the candidate navigation station attributes in this embodiment include fixed attributes and non-fixed attributes. Fixed attributes refer to attributes inherent to each navaid, including but not limited to navaid ID, name, category, VOR frequency, magnetic offset, DME altitude, longitude, and latitude; non-fixed attributes refer to attributes that change as the aircraft operates , including but not limited to the expected tuning mode of the navigation station, whether it is in range, VOR availability status and DME availability status.

1) The expected tuning mode refers to the tuning mode that the navigation station is expected to be used for. The default value of the expected tuning mode is A (auto tuning), if the corresponding navigation station or VOR frequency is used for manual tuning, en route tuning or program tuning , you need to set it to M, R or P correspondingly.

2) "Whether it is within the scope of action" refers to whether the distance between the current position of the aircraft and the navigation station exceeds the maximum operating distance of the wireless signal, if the distance between the current position of the aircraft and the navigation station is less than the maximum signal effect corresponding to the navigation station distance, the indication of whether it is within the valid range is set to Y, otherwise, it is set to N.

3) "VOR available status" refers to whether the validity check and plausibility check of the VOR signal of the navigation station are passed, and whether the navigation station is manually suppressed.

4) "DME availability status" refers to whether the validity check and plausibility check of the DME signal of the navigation station are passed, and whether the navigation station is manually suppressed.

Among them, the validity check refers to checking whether the measurement data output by the navigation equipment is stable in the time domain; the rationality check refers to calculating the theoretical value and actual measurement data of the actual measurement data output by the navigation equipment according to the positional relationship between the aircraft and the navigation station. Is the difference between the actual values within an acceptable range.

The list of candidate navigation stations in this embodiment may be as shown in Table 1:

Table 1,

Table 2 shows the effective range of the type of the navigation station and the signal in this embodiment:

Category ID name Effective range T or C terminal area The distance is not more than 20 nautical miles and the altitude difference is less than 12,000 feet L low altitude Distance not exceeding 40 nautical miles and height difference not exceeding 18,000 feet H high altitude Distance not exceeding 130 nautical miles and height difference not exceeding 60,000 feet U undefined undefined

Table 2

Further, for each candidate navigation station, when any of the following conditions occur, the "Indication of VOR (or DME) Signal Availability Status" should be set to "unavailable":

1. The VOR signal of the navigation station is unavailable (failed to pass the validity or plausibility check) for longer than a preset time (such as 10 seconds); or

2. Received a manual station suppression command for this station.

S22: When the non-fixed attributes in the candidate navigation station list all meet the conditions, then arrange all the candidate navigation stations in the candidate navigation station list according to the distance from the current position of the aircraft from far to near to form a candidate navigation station queue S ₁ , S ₂ ,...,S _N .

Specifically, when the non-fixed attributes in the candidate navigation station list are expected to be in the tuning mode A, whether it is within the scope of action is Y, the VOR available status is Y, and the DME available status is Y, then all candidates in the candidate navigation station list The navigation stations are arranged from far to near according to the distance from the current position of the aircraft to form a queue of candidate navigation stations.

S23: Select the navigation station to be paired from the candidate navigation station queue according to the navigation station pairing selection condition, and calculate the actual navigation performance ANP _i,j when the navigation station to be paired locates the aircraft.

The navigation station pairing selection conditions in this embodiment are:

When the flight altitude of the aircraft is not lower than the preset flight altitude (such as 12,000 feet), the candidate navigation station queue is searched for the one whose angle with the i-th candidate navigation station S _i1 about the aircraft satisfies the first preset angle condition. For the candidate navigation station S _j1 , the candidate navigation station S _i1 and the candidate navigation station S _{j1 are} used as the navigation stations to be paired. Wherein, the first preset angle condition refers to the angle with the smallest difference from the angle of 90°.

When the flight altitude of the aircraft is lower than the preset flight altitude, the candidate navigation station S _j2 whose included angle with the i-th candidate navigation station S _i2 about the aircraft satisfies the second preset angle condition is searched in the candidate navigation station queue, The candidate navigation station S _i2 and the candidate navigation station S _j2 are taken as the navigation stations to be paired. Wherein, the second preset included angle condition refers to an included angle between 30° and 150°.

S24: When the calculated actual navigation performance ANP _i,j is less than the preset navigation performance RNP, store the corresponding to-be-paired navigation station and the corresponding calculated actual navigation performance (S _i ,S _j ,ANP _i,j ) in the initial Select the Navigation Station pairing list.

S25: Select the paired navaid with the lowest actual navigation performance from the primary selection of navaid pairing list as the target paired navaid (S _m , _Sn ), and determine the on-board navaid based on the target paired navaid (S _m , _Sn ) Tuning targets for the five tuning channels on the left and right airborne rangefinders in the device.

Further, as shown in FIG. 4 , in step S25, the tuning targets of the five tuning channels on the left and right two airborne rangefinders in the airborne equipment are determined based on the target pairing navigation station (S _m , S _n ), which specifically includes: Follow the steps below:

S251: Use the two navigation stations S _m and _Sn in the target paired navigation stations as the tuning targets of the first tuning channel and the second tuning channel of each airborne rangefinder in the airborne equipment, respectively.

S252 : when the flight altitude of the aircraft is not lower than the preset flight altitude, select one from the candidate navigation station queue excluding the target paired navigation station and any navigation station in the target paired navigation station with respect to the aircraft, which satisfies the first preset angle The candidate navigation station S _k1 of the included angle condition is used as the tuning target of the third tuning channel of each airborne rangefinder in the airborne equipment. Wherein, the first preset angle condition refers to the angle with the smallest difference from the angle of 90°.

S253: When the flight altitude of the aircraft is lower than the preset flight altitude, select one from the candidate navigation station queue for excluding the target paired navigation station and any navigation station in the target paired navigation station with respect to the aircraft. The included angle satisfies the second preset threshold The candidate navigation station _Sk2 with the angle condition and the closest to the current position of the aircraft is used as the tuning target of the third tuning channel of each airborne rangefinder in the airborne equipment. Wherein, the second preset included angle condition refers to an included angle between 30° and 150°.

Specifically, when the current channel selection state is the 3+2 channel selection state, in the candidate navigation station queue excluding the tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel, select the current position of the aircraft. The nearest candidate navigation station is used as the tuning target of the fourth tuning channel of one of the airborne rangefinders, and the candidate navigation station with the second closest distance to the current position of the aircraft is selected as the fourth tuning channel of the other airborne rangefinder. tuning target.

When the current channel selection state is the 3+1 channel selection state, in the candidate navigation station queue excluding the tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel, select the one closest to the current position of the aircraft. The candidate navigation station is used as the tuning target of the fourth tuning channel of each airborne rangefinder in the airborne equipment and its VHF omnidirectional beacon on the same side.

S254: According to the current channel selection state and the current position of the aircraft, in the candidate navigation station queue excluding the tuning targets corresponding to the first tuning channel, the second tuning channel, and the third tuning channel, select a candidate navigation station that satisfies the preset distance condition as The tuning target for the fourth tuning channel of each airborne rangefinder in the airborne equipment.

S255: The navigation station corresponding to the airborne range finder at the airport of the destination airport of the aircraft is used as the tuning target of the fifth tuning channel of each airborne range finder in the airborne equipment.

Further, as shown in FIG. 5 , a five-channel DME tuning method suitable for large civil aircraft, further comprising:

S201: Based on the current position of the aircraft, according to a preset number, obtain n VOR-DME navigation stations with a short distance as candidate navigation stations.

S202: Generate a list of candidate navigation stations based on the current position of the aircraft and attributes of the candidate navigation stations, where the attributes of the candidate navigation stations include fixed attributes and non-fixed attributes.

S203: Based on the real-time position of the aircraft, update the non-fixed attributes of each candidate navigation station in the candidate navigation station list in real time.

The present invention provides a five-channel DME tuning method suitable for large civil airliners. The current channel selection state is determined by the acquired tuning command, and an automatic tuning algorithm is executed according to the current channel selection state and the adjacent previous channel selection state to determine the current channel selection state. The tuning target of the five tuning channels on the left and right two airborne rangefinders in the airborne equipment, complete the tuning of the two five-channel DMEs, so that the airborne equipment can select the best navigation station in real time for information reception, and can also Taking into account the flight procedure requirements and the pilot's tuning command, a coordinated and orderly communication work is achieved.

Example 2

As shown in FIG. 6, the present invention provides a five-channel DME tuning system suitable for large civil aircraft, including a flight management system FMS and two left and right airborne rangefinders DME (including DME) deployed in the airborne communication and navigation system. -L and DME-R), two left and right very high frequency omnidirectional beacons VOR (including VOR-L and VOR-R) and two left and right instrument landing equipment ILS (including ILS-L and ILS-R).

The flight management system FMS, based on a five-channel DME tuning method suitable for large civil airliners in the above-mentioned embodiment 1, tunes 5 tuning channels on each airborne rangefinder and 1 tuning channel for each VHF omnidirectional beacon channel and the LOC tuning channel of each ILD.

The fourth tuning channel on the airborne rangefinder has the same tuning target as the tuning channel on the VIO beacon on the same side. The fifth tuning channel on the airborne rangefinder has the same tuning target as the LOC tuning channel on the ILD on the same side.

Further, in accordance with the DME/VHF working frequency pairing rules stipulated by the International Civil Aviation Organization, the flight management system performs the tuning target on the fourth tuning channel on the airborne range finder and the tuning channel on the same side of the VHF omnidirectional beacon. Linkage tuning is to perform linked tuning of the fifth tuning channel on the airborne rangefinder and the tuning target of the LOC tuning channel on the instrument landing equipment on the same side.

The above specific embodiments further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Within the spirit and principle of the present invention, any modifications, equivalent replacements, improvements, etc. made should be included within the protection scope of the present invention.

Claims (10)

1. A five-channel DME tuning method suitable for large civil aircraft is characterized by comprising the following steps:

acquiring a tuning command, and determining the current channel selection state according to the tuning command;

if the current channel selection state is different from the adjacent last channel selection state, executing an automatic tuning algorithm based on the current channel selection state, and determining tuning targets of five tuning channels on left and right onboard distance meters in the onboard equipment according to the automatic tuning algorithm;

if the current channel selection state is the same as the adjacent last channel selection state, determining whether the time interval between the current channel selection state and the adjacent last channel selection state exceeds a preset time interval;

if the preset time interval is exceeded, executing an automatic tuning algorithm based on the current channel selection state, and determining tuning targets of five tuning channels on left and right onboard range finders in the onboard equipment according to the automatic tuning algorithm; if the preset time interval is not exceeded, the operation is terminated.

2. The method for DME tuning in five channels for large airliners as defined in claim 1 wherein said determining a tuning status based on said tuning commands comprises:

when the obtained tuning command is not any one of a manual tuning command, a program tuning command and an air route tuning command, entering a 3+2 channel selection state; wherein, the 3+2 channel selection state refers to a state that 3 navigation stations are selected for DME-DME positioning, and 2 navigation stations are selected for VOR-DME positioning;

when the obtained tuning command is a manual tuning command for the unilateral very high frequency omnidirectional beacon, entering a 3+1 channel selection state; wherein, the 3+1 channel selection state refers to a state that 3 navigation stations are selected for DME-DME positioning and one navigation station is selected for VOR-DME positioning;

when the obtained tuning command is any one of a double-side manual tuning command, an airway or program tuning command, a one-side manual tuning and another-side program tuning command and a one-side manual tuning and another-side airway tuning command, entering a 3+0 channel selection state; wherein the 3+0 channel selection state refers to a state in which only 3 navigators are selected for DME-DME positioning.

3. The method for tuning the five-channel DME suitable for the large civil aircraft as claimed in claim 1, wherein the step of determining tuning targets of the five tuning channels on the left and right onboard rangefinders in the onboard equipment according to the automatic tuning algorithm comprises the steps of:

acquiring the current position of the airplane, and inquiring a candidate navigation platform list based on the current position of the airplane;

when all unfixed attributes in the candidate navigation station list meet the conditions, arranging all candidate navigation stations in the candidate navigation station list from far to near according to the distance between the candidate navigation stations and the current position of the airplane to form a candidate navigation station queue;

selecting a navigation station to be paired from the candidate navigation station queue according to the navigation station pairing selection condition, and calculating the actual navigation performance of the navigation station to be paired when the aircraft is positioned;

when the actual navigation performance obtained by calculation is smaller than the preset navigation performance, storing the corresponding navigation station to be paired and the actual navigation performance obtained by corresponding calculation in a pairing list of the initially selected navigation station;

selecting a pair of navigation stations to be paired with the minimum actual navigation performance from the initially selected navigation station pairing list as target pairing navigation stations (S)_m、S_n) And pairing navigational stations (S) based on said object_m、S_n) And determining the tuning targets of five tuning channels on the left and right onboard range finders in the onboard equipment.

4. The method for tuning the five-channel DME suitable for the large civil aircraft as claimed in claim 3, wherein the selecting the navigation station to be paired from the candidate navigation station queue according to the navigation station pairing selection condition comprises:

when the flying height of the airplane is not lower than the preset flying height, searching the candidate navigation station queue for the ith candidate navigation station S_i1Candidate navigation station S with included angle of airplane meeting first preset included angle condition_j1Candidate navigation stations S_i1And candidate navigation stations S_j1As a navigation station to be paired;

when the flying height of the airplane is lower than the preset flying height, searching the candidate navigation station queue for the ith candidate navigation station S_i2Candidate navigation station S with included angle of airplane meeting second preset included angle condition_j2Candidate navigation stations S_i2And candidate navigation stations S_j2As the navigation platform to be paired.

5. The method of claim 3, wherein the base station is adapted for use with a five channel DME tuning system for a large civil aircraftAt the target pairing navigation station (S)_m、S_n) Determining tuning targets of five tuning channels on a left airborne range finder and a right airborne range finder in airborne equipment, comprising:

pairing objects to two of the navigation stations S_mAnd S_nRespectively serving as tuning targets of a first tuning channel and a second tuning channel of each airborne range finder in airborne equipment;

when the flying height of the airplane is not lower than the preset flying height, selecting a candidate navigation station S which meets a first preset included angle condition with an included angle of any navigation station in the target paired navigation stations relative to the airplane from a candidate navigation station queue excluding the target paired navigation stations_k1As a tuning target for a third tuning channel of each airborne range finder in the airborne equipment;

when the flying height of the airplane is lower than the preset flying height, selecting a candidate navigation station S which satisfies a second preset included angle condition with the included angle of any navigation station in the target paired navigation stations relative to the airplane and is closest to the current position of the airplane from the candidate navigation station queue excluding the target paired navigation stations_k2As a tuning target for a third tuning channel of each airborne range finder in the airborne equipment;

according to the current channel selection state and the current position of the airplane, selecting a candidate navigation station which meets a preset distance condition from a candidate navigation station queue of tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel, and taking the candidate navigation station as a tuning target of a fourth tuning channel of each airborne distance meter in airborne equipment;

and taking the navigation station corresponding to the airborne range finder of the airplane flight destination airport as a tuning target of a fifth tuning channel of each airborne range finder in airborne equipment.

6. The method for tuning the five-channel DME in the large-scale civil aircraft as claimed in claim 5, wherein the step of selecting the candidate navigation station satisfying the preset distance condition as the tuning target of the fourth tuning channel of each airborne range finder in the airborne equipment from the candidate navigation station queue excluding the tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel according to the current station selection status and the current position of the aircraft comprises:

when the current channel selection state is a 3+2 channel selection state, selecting a candidate navigation station closest to the current position of the airplane as a tuning target of a fourth tuning channel of one airborne distance measuring device in a candidate navigation station queue excluding tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel, and selecting a candidate navigation station next closest to the current position of the airplane as a tuning target of a fourth tuning channel of the other airborne distance measuring device;

and when the current channel selection state is a 3+1 channel selection state, selecting the candidate navigation station closest to the current position of the airplane from the candidate navigation station queue of tuning targets excluding the tuning targets corresponding to the first tuning channel, the second tuning channel and the third tuning channel as the tuning target of the VHF omnidirectional beacon of the fourth tuning channel of each airborne distance meter and the same side of the fourth tuning channel of each airborne distance meter in the airborne equipment.

7. A five-channel DME tuning method suitable for use in large civil aircraft according to claim 4 or 5,

the first preset included angle condition includes: the included angle with the minimum difference value of the included angles of 90 degrees;

the second preset included angle condition includes: the included angle is between 30 ° and 150 °.

8. The method for tuning five-channel DME suitable for use in a large civil aircraft as claimed in claim 3, wherein the method for tuning five-channel DME suitable for use in a large civil aircraft further comprises:

acquiring n VOR-DME navigation stations with short distances as candidate navigation stations according to a preset number based on the current position of the airplane;

generating a candidate navigation station list based on the current position of the airplane and the attributes of the candidate navigation stations, wherein the attributes of the candidate navigation stations comprise fixed attributes and unfixed attributes;

and updating the unfixed attributes of the candidate navigation stations in the candidate navigation station list in real time based on the real-time position of the airplane.

9. A five-channel DME tuning system suitable for a large civil aircraft is characterized by comprising a flight management system, a left airborne distance meter, a right airborne distance meter, a left very high frequency omnidirectional beacon, a right very high frequency omnidirectional beacon and a left instrument landing device, wherein the left airborne distance meter and the right airborne distance meter are deployed in an airborne communication navigation system;

the flight management system, based on the five-channel DME tuning method suitable for large civil aircraft as described in any one of claims 1-8, tunes 5 tuning channels on each airborne range finder, 1 tuning channel of each very high frequency omnidirectional beacon, and LOC tuning channel of each instrument landing device;

the fourth tuning channel on the airborne range finder and the tuning channel on the VHF omnidirectional beacon at the same side have the same tuning target; and a fifth tuning channel on the airborne range finder is the same as a tuning target of the LOC tuning channel on the instrument landing equipment on the same side.

10. The five-channel DME tuning system suitable for use in a large civil aircraft as claimed in claim 9, wherein the flight management system is configured to tune the fourth tuning channel of the airborne rangefinder in tandem with the tuning target of the tuning channel of the very high frequency omnidirectional beacon on the same side and to tune the fifth tuning channel of the airborne rangefinder in tandem with the tuning target of the LOC tuning channel of the instrument landing device on the same side according to the DME/VHF operating frequency pairing rules specified by the International civil aviation organization.

Images