CN106291612B - A kind of aeronautical satellite inter-satellite link wireless signal high-performance prize judgment method - Google Patents

Abstract

The invention discloses a high-performance capture and judgment method for navigation satellite inter-satellite link wireless signals, the steps of which are: S1: perform digital quadrature demodulation on the received signal, and obtain a complex number composed of two paths of I\Q after low-pass filtering Baseband signal; S2: Resample the complex baseband signal, and then obtain the detection statistics through coherent integration, detection and non-coherent integration, search for the maximum value of all detection statistics, and record the grid point position of the maximum value; the first round of detection After completion, adjust the search range, perform multiple rounds of detection, and check the consistency of the position of the maximum grid point; S3: judge whether the capture is successful according to the test result. The invention has the advantages of adapting to the time-varying characteristics between satellites, improving the capture sensitivity and realizing fast capture.

Description

A High-Performance Acquisition and Judgment Method for Inter-satellite Link Wireless Signals of Navigation Satellites

technical field

The invention mainly relates to the technical field of wireless communication and measurement, in particular to a high-performance acquisition and judgment method suitable for navigation satellite inter-satellite link wireless signals.

Background technique

The Global Navigation Satellite System (GNSS) can provide all-weather precise position and time information for any place in the earth and near-Earth space. In the global satellite navigation system, maintaining high satellite orbit determination accuracy and clock error determination accuracy is the key to ensure that the navigation receiving terminal obtains the positioning or timing accuracy required by the large system.

The demand for inter-satellite ranging function for precise orbit determination and time synchronization of navigation satellites gave birth to the concept of navigation constellation inter-satellite link. Once the link is established between the navigation satellites through the inter-satellite link, the space segment of the navigation system will no longer be a combination of isolated satellites, but will become a coordinated whole. Through the cooperation of the satellite-ground link, the control segment and the space segment of the entire navigation system truly form an all-weather, all-day seamless network, which provides a huge space for the business operation and management of the navigation system. The inter-satellite link can realize the satellite navigation system to obtain the measurement information of other arcs on the orbit through the precise measurement of the inter-satellite link when only a few monitoring stations are configured, so as to achieve the ability to obtain precise orbit parameters.

The navigation constellation inter-satellite link network is a complex satellite network with typical flat and centerless features, and it is a wireless network with a certain number of peer nodes. The navigation constellation inter-satellite link network needs to realize multi-point to multi-point measurement under time constraints. In order to complete the precise measurement function, the navigation satellite system broadcasts and receives spread-spectrum ranging signals through the inter-satellite link to carry out precision measurement between satellites. Range measurement and capture of spread spectrum signals is a two-dimensional search process of pseudocode and carrier. The size of the search range directly determines the speed and difficulty of signal capture. When the inter-satellite link uses the radio ranging method to complete precise ranging and time synchronization, the relative motion of satellites on different orbital planes is relatively large, which brings a large Doppler frequency shift to the measurement signal, thereby increasing the signal The capture range brings certain difficulties to the capture, especially for the limited computing resources on the star. When a measurement communication link is established between any two satellites in the constellation, the inter-satellite distance and Doppler vary widely. In addition, from the perspective of measurement performance and security, inter-satellite wireless signals often use long-period spread spectrum Code, if the prior information is not used, the code phase and the number of two-dimensional search grid points of Doppler are huge, which brings great difficulty to the realization of capture.

For the navigation constellation, time synchronization and precise orbit determination are the basis for the operation of the navigation system, and the satellites in the constellation are all in a high-precision space-time reference. The inter-satellite link system uses the ephemeris and clock difference information of the link-building satellite to predict the arrival time of the signal and Doppler, and can control the delay search range corresponding to the code phase within ten microseconds, while the Doppler search The range is less than 100Hz. The reduction of the capture range reduces the difficulty of capture implementation to a certain extent, but it still faces the following difficulties:

(1) From the perspective of system application, it is often necessary to quickly switch the link building object, resulting in a short duration of the inter-satellite signal. Therefore, the receiver needs to complete the capture quickly.

(2) The distance between the stars is long, requiring high capture sensitivity.

(3) Spaceborne equipment processing resources are tight, and resource utilization needs to be fully improved.

Therefore, the acquisition of inter-satellite link wireless signals is essentially within a certain search range, using limited spaceborne equipment resources to achieve rapid acquisition of weak signals.

The traditional signal acquisition process includes detection statistics generation, peak detection and threshold judgment. The selection of the threshold directly affects the acquisition performance. If the threshold is too low, the probability of false alarm will increase, and if the threshold is too high, the probability of capture will be reduced; therefore, the determination of the threshold very important. Under the constant false alarm criterion, the decision threshold is related to the noise probability distribution and its statistical value. Inter-satellite links need to quickly switch the link building object, causing the antenna pointing to jump, causing the time-varying characteristics of the background noise, making it necessary to re-statistic the noise distribution every time the link is established. However, under the condition of fast signal acquisition, only It can rely on fewer data samples for noise statistics, which is likely to cause deviations in statistical results, resulting in inaccurate thresholds, thereby affecting capture performance. In addition, the setting of the threshold increases the energy standard of the detection statistic, which will reduce the capture sensitivity, which is not conducive to weak signal capture. The realization of the final capture method also needs to consider the resource problem of the spaceborne equipment, optimize and improve the resource utilization of the capture method.

Contents of the invention

The technical problem to be solved by the present invention is: aiming at the technical problems existing in the prior art, the present invention provides a high-performance capture of navigation satellite inter-satellite link wireless signals that can improve capture sensitivity, is suitable for weak signal capture, and can realize fast capture Judgment method.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A navigation satellite inter-satellite link wireless signal high-performance acquisition and judgment method, the steps of which are:

S1: Perform digital quadrature demodulation on the received signal, and obtain a complex baseband signal composed of I\Q two channels after low-pass filtering;

S2: Resample the complex baseband signal, then obtain the detection statistics through coherent integration, detection and non-coherent integration, search for the maximum value of all detection statistics, and record the grid point position of the maximum value; after the first round, continue Perform multiple rounds of detection and check the consistency of the maximum grid point position;

S3: Judging whether the capture is successful or not according to the inspection result.

As a further improvement of the present invention: in the step S2, multiple rounds of grid point search and peak detection are performed, that is, the capture result judgment is realized through the consistency check of the grid point position corresponding to the peak value; after the first round of search is completed, the subsequent The search range will be set according to the phase change caused by Doppler.

As a further improvement of the present invention: in the step S2, the orthogonal demodulation refers to driving the carrier NCO according to the carrier Doppler to generate an orthogonal local carrier signal; The drive phase accumulator generates a signal resampling enable signal.

As a further improvement of the present invention: the detailed process of the step S2 is:

S201: Determine the phase grid point search range according to prior information and its uncertainty; the prior information includes inter-satellite wireless signal arrival time TOA and arrival frequency FOA;

S202: Calculate the detection statistics results of the grid points within the search range;

S203: Search for the maximum value of the detection result, and record the corresponding grid point position;

S204: If it is the first round of search, determine the search range of the subsequent "consistency check" stage according to the grid point position, and return to S202, otherwise enter S205;

S205: Execute a consistency check on the grid point position of the maximum value; the consistency check is: make statistics on the change of the grid point position corresponding to the maximum value in each round, and when the change is less than 1 chip, it is considered "consistent" before and after;

S206: If all inspections have not been completed, return to S202 and enter the next round of search.

As a further improvement of the present invention: in step S3, the confirming the capture result means: if the M consecutive inspection results are "consistent", it is determined that the capture is successful; otherwise, it is determined that the capture fails.

As a further improvement of the present invention: the detection statistical result in the step S202 adopts a time-domain calculation method or a frequency-domain calculation method, and the calculation result is a coherent or non-coherent integration result of the received sequence and the local pseudocode sequence.

As a further improvement of the present invention: the search range of the "consistency check" stage in the step S204 refers to setting the search range of the subsequent "consistency check" stage around the grid point position corresponding to the first round of peak detection results.

As a further improvement of the present invention: the completion of all inspections in the step S206 means that if the M consecutive inspection results are "consistent", the inspection will be ended; otherwise, all inspections will be completed after N rounds of inspections are completed.

As a further improvement of the present invention: the detailed flow of the step S205 is:

S2051: Calculate the detection statistics of all grid points according to the set search range, and the calculation process includes coherent integration, wave detection and non-coherent integration;

S2052: Search for the maximum value in all detection statistics, and record the grid phase

S2053: Compare with the last round maximum grid point phase, define the consistency criterion as If the criterion is satisfied, the counter m is accumulated, otherwise it is cleared;

S2054: If m reaches M, end the capture process, and confirm that the capture is successful, otherwise, check whether the number of checks is reached, if n reaches N, end the capture process, and declare capture failure because m does not reach M;

S2055: If n does not reach N, enter the next round of inspection.

As a further improvement of the present invention: in the acquisition process, the Doppler prior information is used to perform first-order dynamic compensation on the received sequence code phase; The experimental information includes the frequency of the arriving signal and the rate of change of the frequency.

Compared with the prior art, the present invention has the advantages of:

1. The high-performance capture and judgment method for navigation satellite inter-satellite link wireless signals of the present invention avoids the decline in capture performance caused by the inaccurate calculation of the judgment threshold, is conducive to improving capture sensitivity, and is suitable for weak signal capture. By adjusting the search range, it not only reduces Resource consumption, and enables fast capture.

2. The high-performance acquisition and judgment method of the navigation satellite inter-satellite link wireless signal of the present invention, in order to reduce the probability of false alarms, perform multiple rounds of searching for the maximum value, and maintain the consistency of the true value of the code phase through dynamic compensation of the code phase, in order to Further improved the capture search speed, and readjusted the search range in the "consistency check" stage.

3. The high-performance acquisition and judgment method of navigation satellite inter-satellite link wireless signals of the present invention avoids the problems of statistical inaccuracy, computing resource consumption, and reduction of acquisition sensitivity caused by traditional threshold judgments, and not only fully satisfies the problems caused by the inter-satellite link system. It can also be widely used in various types of spaceborne and terrestrial spread spectrum receivers for the fast acquisition of signals under the condition of time-varying noise characteristics.

Description of drawings

Fig. 1 is a schematic diagram of the wireless signal structure of the inter-satellite link integrated with ranging communication.

Fig. 2 is a schematic diagram of the principle of inter-satellite link wireless signal acquisition in a specific application of the present invention.

Fig. 3 is a schematic flow chart of searching in a specific application of the present invention.

Fig. 4 is a schematic flow chart of the consistency check in the specific application of the present invention.

Fig. 5 is a schematic diagram of the principle of the code phase dynamic compensation function of the present invention in a specific application.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, it is a schematic diagram of the wireless signal structure of the inter-satellite link integrated with ranging communication, including the measurement branch and the communication branch. Among them, the measurement branch does not contain data information, but only includes spreading codes, and the communication branch contains data information, which is modulated by spread spectrum. The two branches modulate the carrier according to the UQPSK method to generate inter-satellite wireless signals. The signal model generated from this structure is:

In the formula:

j: indicates the satellite number;

A _c : Indicates the amplitude of the ranging spread spectrum code modulated on the carrier I branch of each frequency point;

A _p : Indicates the amplitude of the communication spreading code modulated on the carrier Q branch of each frequency point;

C: Indicates the I branch ranging spreading code;

P: Indicates Q branch communication spreading code;

D _p : Indicates the data code modulated on the Q branch communication spreading code;

f: Indicates the inter-satellite link carrier frequency;

Indicates the initial carrier phase of the inter-satellite link measurement channel;

Indicates the initial carrier phase of the inter-satellite link communication channel.

The receiver receives the inter-satellite wireless signal, and realizes inter-satellite ranging and time synchronization functions by tracking the pseudo code or carrier phase of the measurement branch, and assists in completing the data transmission function of the communication branch. Therefore, the receiver only captures the measurement branch deal with.

The core principle of the present invention is: calculate the detection statistics results of all grid points in the search interval, find the maximum value and record the position of the grid point where it is located; then repeatedly calculate the detection results and search for the maximum At the same time, record the grid position corresponding to each round of search, and finally determine whether the capture is successful or not through the consistency check of the grid position where the maximum value is located.

As shown in Figure 2 and Figure 3, the navigation satellite inter-satellite link wireless signal high-performance capture judgment method of the present invention, its specific steps are:

S1: Perform digital quadrature demodulation on the received signal, and obtain a complex baseband signal composed of I\Q two channels after low-pass filtering;

S2: Resample the signal, and the resampling rate is twice the rate of the pseudo code; after that, the detection statistics are obtained through coherent integration, detection and non-coherent integration, and the maximum value of all detection statistics is searched, and the grid point of the maximum value is recorded position; after the end of the first round, continue to perform multiple rounds of detection, and check the consistency of the position of the maximum grid point;

S3: Judging whether the capture is successful or not according to the inspection result.

The present invention executes multiple rounds of grid point search and peak detection in step S2, and realizes the judgment of the capture result by checking the consistency of the grid point position corresponding to the peak value. Moreover, in order to improve the acquisition speed, after the first round of search is completed, the follow-up search range will be set according to the phase change caused by Doppler. In the case of ensuring the acquisition performance, redundant searches should be avoided as much as possible.

In step S2, quadrature demodulation refers to driving the carrier NCO according to carrier Doppler to generate an orthogonal local carrier signal. Signal resampling refers to generating a signal resampling enable signal by driving the phase accumulator according to the pseudo-code Doppler. Coherent integration means that according to the requirements of resources and capture time, time domain method or frequency domain method can be adopted, and serial structure or parallel structure can be adopted. Detection means that "envelope detection", "square law detection" or "differential detection" can be used.

In this embodiment, the detailed flow of the above step S2 is as follows:

S201: Determine the phase grid point search range according to prior information and its uncertainty; the prior information includes time of arrival (TOA) and frequency of arrival (FOA) of inter-satellite wireless signals;

S202: Calculate the detection statistics results of the grid points within the search range; the detection statistics results can use a time domain calculation method or a frequency domain calculation method, and the calculation result is a coherent or non-coherent integration result of the received sequence and the local pseudo code sequence;

S203: Search for the maximum value of the detection result, and record the corresponding grid point position;

S204: If it is the first round of search, determine the search range of the subsequent "consistency check" stage according to the grid point position, and return to S202, otherwise enter S205; the search range of the "consistency check" stage refers to: corresponding to the first round of peak detection results Set the search range of the follow-up "consistency check" stage as the center;

S205: Execute a consistency check on the grid point position of the maximum value; the consistency check is: make statistics on the change of the grid point position corresponding to the maximum value in each round, and when the change is less than 1 chip, it is considered "consistent" before and after;

S206: If all inspections have not been completed, return to S202 and enter the next round of search. The completion of all inspections means that if the results of M consecutive inspections are "consistent", the inspection will be ended; otherwise, all inspections will be completed after N rounds of inspections are completed.

In step S3, the confirming the capture result means: if the M consecutive inspection results are "consistent", it is determined that the capture is successful; otherwise, it is determined that the capture fails.

As shown in FIG. 4, in this embodiment, the detailed flow of the above step S205 is:

S2051: Calculate the detection statistics of all grid points according to the set search range, and the calculation process includes coherent integration, wave detection and non-coherent integration;

S2052: Search for the maximum value in all detection statistics, and record the grid phase

S2053: Compare with the last round maximum grid point phase, define the consistency criterion as If the criterion is satisfied, the counter m is accumulated, otherwise it is cleared;

S2054: If m reaches M, end the capture process, and confirm that the capture is successful, otherwise, check whether the number of checks is reached, if n reaches N, end the capture process, and declare capture failure because m does not reach M;

S2055: If n does not reach N, enter the next round of inspection.

In the above process, the consistency criterion refers to: the factors that cause the phase change of the grid point include the change of the code phase during the two rounds of search and the ambiguity of the system resolution. Since half a chip is used as the phase search grid point, the system resolution There is an ambiguity of a phase lattice point in the rate, that is, theoretically In addition, the maximum change value of the code phase during the two rounds of search is limited to 1/4 chip, that is, 1/2 phase grid point, so that still holds. Therefore, with As a consistency criterion, the premise is that the code phase changes less than 1/4 chip during two rounds of search, and this needs to be guaranteed by code Doppler compensation.

The search range is: in the first round of search, it is set according to the change interval of the signal arrival time TOA, and the change range of TOA is [T _OA -△T _OA , T _OA +△T _OA ], where T _OA represents the estimated The resulting TOA, ΔT _OA, represents the estimated bias. Set the capture start time as T _OA +△T _OA , then the time interval corresponding to the phase search is [0,2△T _OA ]. The advantage of this setting is that the signal has already arrived when the search is started, avoiding false alarms under no-signal conditions.

After the first round of search is over, it enters the stage of "consistency check", and the subsequent search intervals will be set according to the peak grid point position of the first round of search, with the center of The determination of the search range needs to consider the code phase change during the search, which will affect the false alarm probability. In the case of code Doppler compensation, the code phase change is only a few chips. If the set search range is smaller than the search unit of the current capture method, it can be adjusted to be the same as the search unit. Although there is redundant search, the multiplexing of search resources is realized, which can improve resource utilization.

Furthermore, in order to ensure the exact consistency of the true value of the grid point position, the Doppler prior information is used to perform first-order dynamic compensation on the received sequence code phase during the capture process; if the accuracy of the first-order dynamic compensation is insufficient, the second-order dynamic compensation can be used. Compensation, the prior information used for compensation includes arrival signal frequency and frequency change rate.

As shown in FIG. 5 , a schematic diagram of the code phase dynamic compensation function principle in a specific application example of the present invention includes first-order code phase compensation control and second-order code phase compensation control. The first-order compensation control means: first, the digital phase value is accumulated according to the frequency control word, and at the time when the phase value crosses a cycle, a whole cycle pulse is generated, and the average interval of the pulse is consistent with the cycle corresponding to the frequency control word. The whole cycle pulse will be used as a control signal for data selection to realize resampling of data. The frequency modulation control word is added to the second-order compensation control. On the basis of the frequency control word, the real-time tracking control of the frequency and its changes is realized. Therefore, it is more accurate than the first-order compensation control.

The phase expression in the first-order compensation control is:

In the formula, E represents the frequency control word, Indicates the initial phase value, L indicates the length of the phase accumulator, and the calculation method of the frequency control word is:

In the formula, [ ] represents the rounding operation, f _c represents the resampling frequency after compensation, and f _s represents the data sampling clock frequency. f _c is equal to twice the rate of the received spread spectrum code, including the Doppler shift caused by the relative motion speed between the stars, which can be calculated according to the frequency FOA of the arriving signal.

When the first-order compensation control is adopted, the estimation error of _fc brought by prior information is assumed to be △ _fc , and correspondingly, the deviation △E of the frequency control word is:

Assuming that the number of sampling pulses corresponding to the two rounds of search time interval is N, then the phase change caused by the Doppler frequency difference during the two rounds of search is △EN, when:

△EN>2 ^L-1 (5)

That is, if the code phase changes more than 1/4 chip, it may cause resulting in missed detection. In this case, the second-order compensation control is required. Compared with the first-order compensation, although the resource consumption is increased, the accuracy is higher.

The phase expression in the second-order compensation control is:

In the formula, F represents the FM control word, and M represents the length of the frequency accumulator. The calculation method of the FM control word is:

Among them, _f'c is equal to twice the velocity change rate of the received spreading code, which includes the Doppler frequency change caused by the relative motion acceleration between the satellites, and can be calculated according to the MOA of the frequency change rate of the arriving signal.

Based on the above-mentioned method of the present invention, the performance analysis after concrete implementation is the following aspects:

(1) False alarm probability;

Assuming the total number of searches is N, the consistency check threshold is M, that is, it needs to meet the phase consistency condition for M consecutive times, and the capture is determined to be successful. The number of grid points in the first round of search is L ₀ , and each round of search The number of grid points is L _c . The occurrence of false alarms can be divided into two situations. The first one is that the search range of the "consistency check" stage does not include the real code phase and its adjacent grid points. The conditional probability in this case is defined as P _f1 .

Assuming that the probability of passing the "consistency test" by the nth round is P _f1 (n), it can be described as (n-M+1,n-M+2,L,n) rounds all conform to the consistency criterion, and the nMth round Does not meet the consistency criterion, there are no consecutive M rounds within 1 to nM-1 rounds that meet the consistency criterion. Under the above conditions, if n-M+1 does not meet the consistency criterion, and other conditions remain unchanged, then when n+1 rounds meet the consistency criterion, the "consistency test" will be passed by the end of n+1 rounds. In addition, When the nM rounds meet the consistency criterion, but it will not cause the nM rounds to pass the "consistency check", if the n+1 rounds meet the consistency criterion, the n+1 rounds will still pass the "consistency check". Using the above relationship to get:

In the formula, C represents combination, when n<2M, P _f1 (nM)=0, then, according to (8), get

P _f1 (n+1)=P _f1 (n)n≥M+1 (9)

Combining (8) and (9), we get that P _f1 (n+1)≤P _f1 (n), then, in the first case, the false alarm probability satisfies

Among them, P _f1 (M) represents the probability of passing the consistency check in the first M rounds, which can be expressed as:

P _f1 (M+1) represents the probability that the first round does not meet the consistency criterion and then M rounds pass the consistency test, which can be expressed as:

therefore,

The first case can be described as that the difference between the maximum phase of the first round of search and the real code phase is greater than Then, when confirming the search range in the "consistency check" stage, the real code phase and its adjacent grid points are excluded. The probability of the first case occurring is:

In the formula, P _d3 represents the probability that any one of the real code phase and its two adjacent lattice points becomes the maximum value.

The second case is that the search range of the "consistency check" stage includes the real code phase and its adjacent grid points. Referring to the calculation method in the first case, the conditional probability in this case satisfies:

The probability of the second case can be expressed as:

Then, the total false alarm probability is expressed as:

(17)

(2) capture probability;

Define the probability of passing the "consistency check" as of the nth round and the result is the real code phase or adjacent grid point as _Pd (n), then the total capture probability is:

Among them, P _d (M) represents the probability of passing the consistency test in the first M rounds, which can be expressed as:

P _d (M)=(P _d3 ) ^M+1 (19)

Then, the total capture probability satisfies:

P _d >(P _d3 ) ^M+1 (20)

(3) capture time;

Suppose the first round of search time is T ₀ , and the search time of each round in the "consistency check" stage is T _c , then the capture time satisfies:

T ₀ +MT _c ≤T ₀ +nT _c ≤T ₀ +NT _c (21)

Parameter calculation:

Usually, the criterion is to increase the capture probability under a certain false alarm probability condition. First, N, M, L _c , P _d3 are determined according to formula (17). In the parameter combination satisfying the false alarm probability condition, try to select a smaller M and a larger P _d3 , so as to increase the capture probability. However, P _d3 is related to factors such as integration time, input signal carrier-to-noise ratio, and noise distribution characteristics. A larger P _d3 needs to increase the pre-detection integration time or reduce the capture sensitivity. If the capture sensitivity is constant, the minimum carrier-to-noise ratio , perform Monte Carlo simulation on P _d3 according to the actual distribution characteristics of the noise, and finally determine the pre-detection integration time.

In a specific application example, parameter selection is performed under the condition that the false alarm probability is required to be less than 10 ^-5 and the capture probability is greater than 95%. Take N=4, M=3, L _c =60, P _d3 =0.992, then, according to (17), the false alarm probability satisfies P _f <2×10 ^-6 , and according to (20), the capture probability P _d >96.8 %.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims (10)

1. A navigation satellite inter-satellite link wireless signal high-performance capture judgment method is characterized in that the steps are: S1: Perform digital quadrature demodulation on the received signal, and obtain a complex baseband signal composed of I\Q two channels after low-pass filtering; S2: Resample the complex baseband signal, then obtain the detection statistics through coherent integration, detection and non-coherent integration, search for the maximum value of all detection statistics, and record the grid point position of the maximum value; after the first round, continue Perform multiple rounds of detection and check the consistency of the maximum grid point position; S3: Judging whether the capture is successful or not according to the inspection result. 2. The navigation satellite inter-satellite link wireless signal high-performance capture judgment method according to claim 1, is characterized in that, in described step S2, carries out multi-round lattice point search and peak detection, namely by corresponding to peak value The consistency check of the grid position realizes the judgment of the capture result; after the first round of search is completed, the subsequent search range will be set according to the phase change caused by Doppler. 3. the navigation satellite inter-satellite link wireless signal high-performance capture decision method according to claim 1, is characterized in that, in described step S2, described orthogonal demodulation refers to drive carrier NCO to generate according to carrier Doppler Orthogonal local carrier signals; the signal resampling refers to generating a signal resampling enable signal by driving a phase accumulator according to pseudo-code Doppler. 4. according to claim 1 or 2 or 3 described navigation satellite inter-satellite link wireless signal high-performance acquisition judgment method, it is characterized in that, the detailed flow process of described step S2 is: S201: Determine the phase grid point search range according to prior information and its uncertainty; the prior information includes inter-satellite wireless signal arrival time TOA and arrival frequency FOA; S202: Calculate the detection statistics results of the grid points within the search range; S203: Search for the maximum value of the detection result, and record the corresponding grid point position; S204: If it is the first round of search, determine the search range of the subsequent "consistency check" stage according to the grid point position, and return to S202, otherwise enter S205; S205: Execute a consistency check on the grid point position of the maximum value; the consistency check is: make statistics on the change of the grid point position corresponding to the maximum value in each round, and when the change is less than 1 chip, it is considered "consistent" before and after; S206: If all inspections have not been completed, return to S202 and enter the next round of search. 5. The navigation satellite inter-satellite link wireless signal high-performance capture judgment method according to claim 4, is characterized in that, in step S3, described confirmation capture result refers to: if M times of inspection result " consistent " continuously, Then it is determined that the capture is successful, otherwise, it is determined that the capture fails. 6. The navigation satellite inter-satellite link wireless signal high-performance acquisition judgment method according to claim 4, it is characterized in that, the detection statistical result described in the step S202 adopts a time domain calculation method or a frequency domain calculation method to calculate The result is the result of coherent integration or non-coherent integration of the received sequence and the local pseudocode sequence. 7. The navigation satellite inter-satellite link wireless signal high-performance acquisition and decision method according to claim 4, characterized in that, the "consistency check" stage search range in the step S204 refers to: with the first round of peak detection The grid position corresponding to the result is used as the center to set the search range of the subsequent "consistency check" stage. 8. The navigation satellite inter-satellite link wireless signal high-performance acquisition judgment method according to claim 4, is characterized in that, all inspections described in the step S206 are completed and means that if the consecutive M times of inspection results are "consistent", then End the inspection, otherwise, wait until the end of N rounds of inspection and complete all inspections. 9. The navigation satellite inter-satellite link wireless signal high-performance capture judgment method according to claim 4, is characterized in that, the detailed flow process of described step S205 is: S2051: Calculate the detection statistics of all grid points according to the set search range, and the calculation process includes coherent integration, wave detection and non-coherent integration; S2052: Search for the maximum value in all detection statistics, and record the grid phase S2053: Compare with the last round maximum grid point phase, define the consistency criterion as If the criterion is satisfied, the counter m is accumulated, otherwise it is cleared; S2054: If m reaches M, end the capture process, and confirm that the capture is successful, otherwise, check whether the number of checks is reached, if n reaches N, end the capture process, and declare capture failure because m does not reach M; S2055: If n does not reach N, enter the next round of inspection. 10. according to claim 1 or 2 or 3 described navigation satellite inter-satellite link wireless signal high-performance acquisition decision method, it is characterized in that, utilize Doppler prior information to carry out first-order to receiving sequence code phase in acquisition process Dynamic compensation; if the accuracy of the first-order dynamic compensation is insufficient, the second-order dynamic compensation is further used, and the prior information used for compensation includes the frequency of the arriving signal and the frequency change rate.