JP2023010049A - Observation program, observation method, observation equipment, and observation system - Google Patents

Abstract

A new technique for observing water surface fluctuations different from waves is provided. The observation program acquires radar image data obtained by periodically observing a sea area to be observed by a radar device using radio waves with a wavelength of 0.01 m to 2 m, and is represented by the acquired data. An average image is calculated by averaging the radar images for each predetermined average time in the order of observation time, and information based on the calculated average image is output. [Selection drawing] Fig. 6

Description

The present invention relates to an observation program, an observation method, an observation device, and an observation system.

For example, in power plants such as thermal power plants and nuclear power plants, seawater is taken in from the water intake, and after the steam that has turned the turbine is cooled with seawater, the warmed seawater (warm water) is discharged from the water outlet to the sea area. is reverting to In the sea area where the warm water is discharged, a jet is formed by the warm water, and the temperature rises. Electric power companies are required to investigate the diffusion of warm effluent through an environmental assessment when constructing a power plant, and to take countermeasures. For example, considering the impact of warm effluent on fisheries resources and aquatic organisms, it is necessary to set the position of the outlet to narrow the water temperature rise range due to warm effluent. In addition, since cooling efficiency decreases when seawater whose temperature has risen due to warm water is taken in, it is necessary to set the water intake in consideration of the recirculation of warm water.

The range where the temperature rises due to hot water is determined by observing the hot water jet. Conventional techniques for observing jets of thermal effluent from power plants include offshore observation by ships, observation by ocean radar, buoy observation, and fixed camera observation. In addition, Non-Patent Document 1 reports that a river front can be clearly confirmed in a radar image obtained by an X-band radar.

Satoshi Takewaka, “Visibility of River Plume Fronts with an X-Band Radar.” Journal of Sensors 2016:e6594847, 13 Dec 2015

However, marine observation by ship is expensive because it uses a ship, and whether or not the observation can be carried out depends on the sea conditions. For example, if the sea is rough or the weather is not suitable for observation, such as fog, observation cannot be performed. Ocean radar can measure the surface layer flow of the sea surface using radio waves of VHF to HF band frequencies, but it cannot sufficiently observe jets because the jets spread too close and the spatial resolution is low. The buoy observation can observe the jet by flowing the buoy from the outlet, but it depends on the sea conditions. Fixed camera observations cannot observe during dark hours.

Non-Patent Document 1 observes a river front where fresh water from a river mouth and salt water from the sea are mixed, and cannot observe jets.

Here, in a sea area where a jet flows, water surface fluctuations different from waves occur due to the jet. Therefore, by observing water surface fluctuations different from waves, for example, a jet can be observed. In addition, by observing water surface fluctuations that are different from waves, it is possible to observe, for example, gas leaks from the seabed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new technique for observing water surface fluctuations other than waves.

In order to solve the above-described problems and achieve the object, an observation program of the present invention provides a computer with a radar device that periodically observes a sea area to be observed by a radar device using radio waves with a wavelength of 0.01 m to 2 m. A process of acquiring image data, calculating an average image by averaging the radar image indicated by the acquired data for each predetermined average time in order of observation time, and outputting information based on the calculated average image. to run.

ADVANTAGE OF THE INVENTION This invention is effective in the ability to provide the new technique which observes a water surface change different from a wave.

FIG. 1 is a diagram illustrating an example of the configuration of an observation system according to an embodiment. FIG. 2 is a diagram illustrating an example of a functional configuration of the observation device according to the embodiment; FIG. 3 is a diagram illustrating an example of a radar image according to the embodiment; FIG. 4A is a diagram for explaining observation by radar according to the embodiment. FIG. 4B is a diagram for explaining the effect of time-averaging observation results by the radar according to the embodiment. FIG. 5A is a diagram showing an example of an average image according to the embodiment; FIG. 5B is a diagram illustrating an example of an average image according to the embodiment; FIG. 5C is a diagram illustrating an example of an average image according to the embodiment; FIG. 5D is a diagram illustrating an example of an average image according to the embodiment; FIG. 5E is a diagram illustrating an example of an average image according to the embodiment; FIG. 5F is a diagram illustrating an example of an average image according to the embodiment; FIG. 5G is a diagram illustrating an example of an average image according to the embodiment; FIG. 6 is a flowchart illustrating an example of the procedure of observation processing according to the embodiment. FIG. 7 is a diagram showing a computer that executes an observation program.

Hereinafter, embodiments of an observation program, an observation method, an observation apparatus, and an observation system according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this Example. Further, each embodiment can be appropriately combined within a range that does not contradict the processing contents.

In the embodiment, a case of observing water surface fluctuations due to jets by observing water surface fluctuations different from waves will be described as an example. In addition, in the examples, examples of observing water surface fluctuations different from waves generated by jets of thermal wastewater discharged into the sea from water outlets at power plants such as thermal power plants and nuclear power plants will be mainly described. .

[Typical Configuration of Observation System]
A representative configuration of the observation system according to this embodiment will be described. FIG. 1 is a diagram illustrating an example of the configuration of an observation system according to an embodiment. The observation system 10 has a radar device 11 and an observation device 12 .

The radar device 11 detects a target by emitting radio waves with a wavelength of 0.01 m to 2 m and capturing the reflected waves. In this embodiment, a marine radar device is used as the radar device 11 . The radar device 11 detects a target using X-band or S-band radio waves. The radar device 11 has a directional antenna, and can detect targets all around in the horizontal direction by setting the antenna horizontally and rotating it. The radar device 11 alternately switches between transmission and reception of radio waves using an antenna. The radar device 11 measures the distance to the target from the time from when the radio wave is transmitted by the antenna until the reflected wave is received, and measures the direction of the target from the direction of the antenna. The radar device 11 generates radar image data by mapping the detected target. During observation, the radar device 11 associates the data of the radar image observed periodically with the observation time and stores them as observation data. The radar device 11 outputs observation data to the observation device 12 after completing the observation. The radar device 11 may output the data of the generated radar image to the observation device 12 at any time in association with the observation time.

The observation device 12 is a device used for observing the jet. The observation device 12 is, for example, a computer such as a personal computer or a server computer. The observation device 12 may be implemented as one computer, or may be implemented as a computer system with a plurality of computers. In this embodiment, a case where the observation device 12 is one computer will be described as an example.

The observation device 12 analyzes radar image data input from the radar device 11 and observes water surface fluctuations different from waves.

The observation system 10 according to the embodiment periodically observes the sea area to be observed by the radar device 11, analyzes the observed radar image data by the observation device 12, and observes the jet.

[Configuration of observation device 12]
Next, the configuration of the observation device 12 will be described. FIG. 2 is a diagram showing an example of the functional configuration of the observation device 12 according to the embodiment. The observation device 12 has an external interface section 20 , an operation section 21 , a display section 22 , a storage section 23 and a control section 24 .

The external interface unit 20 is an interface that transmits and receives various information to and from other devices. The external interface unit 20 is connected to a network and a communication bus to transmit and receive various types of information. For example, the external interface unit 20 receives radar image data from the radar device 11 via the network.

The operation unit 21 is an input device that receives inputs for various operations. As the operation unit 21, an input device such as a mouse or a keyboard that receives an operation input can be used. The operation unit 21 receives input of various information. The operation unit 21 receives an operation input from the user and inputs operation information indicating the content of the received operation to the control unit 24 .

The display unit 22 is a display device that displays various information. Examples of the display unit 22 include display devices such as LCDs (Liquid Crystal Displays) and CRTs (Cathode Ray Tubes). The display unit 22 displays various information. For example, the display unit 22 displays various screens such as an operation screen. Note that the observation device 12 may receive access from an external terminal device used by an administrator or the like, display various screens such as an operation screen on the terminal device, and receive operation inputs from the various screens.

The storage unit 23 is a storage device that stores various data. For example, the storage unit 23 is a storage device such as a hard disk, SSD (Solid State Drive), or optical disk. Note that the storage unit 23 may be a rewritable semiconductor memory such as a RAM (Random Access Memory), a flash memory, or an NVSRAM (Non Volatile Static Random Access Memory).

The storage unit 23 stores an OS (Operating System) and various programs executed by the control unit 24 . For example, the storage unit 23 stores various programs including an observation program for executing observation processing, which will be described later. Furthermore, the storage unit 23 stores various data used in the programs executed by the control unit 24 . For example, the storage unit 23 stores observation data 30 .

Observation data 30 is data observed by the radar device 11 . For example, the observation data 30 stores radar image data in association with observation time.

The control unit 24 is a device that controls the observation device 12 . As the control unit 24, an electronic circuit such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit), or an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array) can be employed. The control unit 24 has an internal memory for storing programs defining various processing procedures and control data, and executes various processing using these. The control unit 24 functions as various processing units by running various programs. For example, the control unit 24 has an acquisition unit 40 , a calculation unit 41 and an output unit 42 .

The acquisition unit 40 acquires radar image data obtained by periodically observing the sea area to be observed by the radar device 11 . For example, when the radar device 11 generates observation data including radar image data obtained by periodically observing a sea area to be observed, the acquisition unit 40 receives the observation data from the radar device 11 or an external device that stores the observation data. is acquired, and the acquired observation data is stored in the storage unit 23 as the observation data 30 . Further, when the radar device 11 transmits radar image data at any time, the acquisition unit 40 acquires the radar image data received from the radar device 11 by the external interface unit 20 . The acquisition unit 40 stores the acquired radar image data in the storage unit 23 as the observation data 30 in association with the observation time. The observation time may be transmitted to the observation device 12 by the radar device 11 in association with radar image data. Alternatively, the observation time may be the time when the radar device 11 receives the radar image data.

The calculation unit 41 calculates an average image by averaging the radar images represented by the data acquired by the acquisition unit 40 for each predetermined average time in order of observation time. For example, the calculation unit 41 reads the radar images from the observation data 30 stored in the storage unit 23 in order of observation time, and averages the radar images whose observation time is within the respective average time for each average time. Calculate the image. The calculation unit 41 calculates the average value of the pixel values of the pixels at the same position for each pixel position in the radar image for each radar image within the averaging time, and calculates the average value for each pixel position in the radar image. Calculate the average image with the value as the pixel value.

Here, waves propagate in the sea. In addition, in the sea area where the hot water is discharged from the outlet, a jet of hot water is formed. As a result, in the sea area where the warm effluent is discharged, the water surface changes due to the jet flow, which is different from that caused by waves.

The radar device 11 detects a target by emitting radio waves and capturing the reflected waves. Therefore, images of waves and jets appear in the radar image observed by the radar device 11 . For example, the radar device 11 is assumed to be a marine radar device using X-band or S-band radio waves. The X band has a wavelength of 3 cm (0.03 m), the S band has a wavelength of 10 cm (0.1 m), and is strongly reflected by waves and disturbances (structures) of about 1.5 cm and 5 cm, respectively. (Bragg scattering). The radar device 11 can detect the shape of the water surface (waves) from the intensity of scattering.

FIG. 3 is a diagram illustrating an example of a radar image according to the embodiment; FIG. 3 is a radar image observed by the radar device 11 of a sea area where a power plant is discharging warm wastewater from a water outlet. FIG. 3 shows a semi-circular radar image centered on the position of the radar device 11 and containing images of detected targets. FIG. 3 also shows the azimuth and distance in the radar image. The radar image shows two breakwaters BW1 and BW2 existing in the sea area. In FIG. 3, a water outlet is provided at the base of the breakwater BW1, and warm waste water is discharged. FIG. 3 shows an image due to waves. In addition, an image of water surface fluctuation due to a jet stream of warm wastewater discharged from the water outlet is shown linearly from the vicinity of the base of the breakwater BW1.

Waves are propagating on the water surface and appear periodically at each position in the sea area. On the other hand, a jet is a flow in which seawater discharged from a water outlet diffuses into the sea area. When a turbulent structure is formed near the water surface, minute changes appear irregularly in the shape of the water surface as the flow converges and diverges. do. This change in water surface shape has a shorter cycle (wavelength) than normal waves, and repeats generation and disappearance within a short period of time. For this reason, frequent observation by a radar device using radio waves with a wavelength of 0.01 m to 2 m, which is close to the wavelength of the water surface shape, makes it possible to capture the water surface shape caused by the turbulent structure as changes in the scattering intensity. In this embodiment, the radar device 11 is a marine radar device, and the wavelength of radio waves is the X band or the S band, but the present invention is not limited to this. The wavelength of the radio waves of the radar device 11 may be radio waves with a wavelength of 0.01 m to 2 m. For example, the radar device 11 may periodically observe the sea area using radio waves of any one of the X band, C band, S band, and L band.

As described above, waves propagate on the surface of the water and periodically appear at respective positions in the sea area. Therefore, by averaging the periodically observed radar images, the waves are averaged in the average image, and the waves can be made inconspicuous.

FIG. 4A is a diagram for explaining observation by radar according to the embodiment. FIG. 4A shows an image of jet flow, wave conditions, and radio wave scattering occurring there. In FIG. 4A, in addition to oceanic waves, minute water surface fluctuations occur in the range of influence of jets. Radio wave scattering is caused by both waves and water surface fluctuations. Since the water surface fluctuation caused by the jet is close to the wavelength at which radio waves are strongly scattered, strong scattering occurs. Convergence of currents at tides (boundaries of different water quality) can also cause water surface fluctuations. Water surface fluctuations caused by jets repeatedly form and disappear, and are not always formed in the same place. Therefore, instantaneous observation results cannot separate the water surface fluctuation caused by the jet from the waves, and it is difficult to grasp the direction and velocity of the jet.

FIG. 4B is a diagram for explaining the effect of time-averaging observation results by the radar according to the embodiment. FIG. 4B shows an image of the effect of averaging observations obtained periodically by radar. Since oceanic waves are periodic fluctuations, their values become almost constant by averaging. Therefore, the effect of oceanic waves can be removed by averaging the radar images. On the other hand, by averaging the position of the water surface fluctuation caused by the jet, it becomes clear in which area it occurs. In addition, since this area moves downstream (moves together with the water mass) due to the flow of the jet, it is possible to grasp the current direction and velocity of the jet by tracking the movement. This is the reason why vortices and the like are clearly visible. At the boundary between the jet and the sea water, a boundary corresponding to the tidal line can be seen. On the other hand, around the convergence area (tidal eye), conversely, divergence makes the water surface smoother, reducing scattering, and the trajectory of the jet may appear more clearly on the radar image. By averaging the radar observation results in this way, it is possible to identify a range in which water surface turbulence is large (a jet influence range). In addition, since the range of turbulence (mass of water) is swept by the flow of the discharged water, the flow direction and flow velocity of the jet can be calculated by following the time change.

Sufficient radar observations are required for the wave period (Tw) in order to average the waves and remove their effects. If the radar observation period is Tr and the number of observations is N, the number of waves to be averaged is Tr×N/Tw. At least Tr×N>Tw/2 should be satisfied in order to remove periodic fluctuations of waves. That is, the number of observations N must satisfy N>0.5×Tw/Tr. If the radar observation period Tr is sufficiently smaller than the wave period Tw, averaging is possible even under near-minimum conditions.

However, in reality, the wave period Tw is about 5 to 15 seconds. Further, the marine radar apparatus is a rotary radar apparatus with a rotating antenna, and the radar observation period Tr due to the rotation of the antenna is about 1 to 3 seconds. For this reason, Tw/2 is an average of observation results of only several times, and cannot be sufficiently averaged. For this reason, for example, in the case of a rotary radar system such as a marine radar system, an average time of about 30 seconds or more is suitable.

On the other hand, a longer averaging time is advantageous for clarification of the jet, but the longer the averaging time, the more the flow caused by the jet is averaged. Therefore, in confirming the jet phenomenon, it is necessary to set a short averaging time with respect to the temporal change of the phenomenon.

The optimal averaging time for observing a jet depends on the velocity of the jet to be observed, the speed of change in flow direction, and the phenomenon to be observed. The inventor of the present application calculated the average image by variously changing the average time for calculating the average image, and verified each average image. 5A to 5G are diagrams showing examples of average images according to the embodiment. FIG. 5A is an average image with an average time of 10 seconds. FIG. 5B is an average image with an average time of 30 seconds. FIG. 5C is an average image with an average time of 1 minute. FIG. 5D is an average image with an average time of 5 minutes. FIG. 5E is an average image with an average time of 10 minutes. FIG. 5F is an average image with an average time of 15 minutes. FIG. 5G is an average image with an average time of 30 minutes.

As a result of varying the averaging time, it was found that the averaging time is preferably 1 to 10 minutes. For example, as shown in FIGS. 5A and 5B, when the averaging time is set to 10 seconds and 30 seconds, the image of the wave remains in the average image, and the image of the water surface fluctuation due to the hot water jet discharged from the water outlet. There is a part where it is difficult to distinguish between the image and the image of waves. As shown in FIGS. 5F and 5G, when the averaging time is set to 15 minutes and 30 minutes, the waves are averaged and the image of the waves disappears in the average image, but the details of the jet become unclear, and the jet becomes unclear. Behavior analysis becomes difficult. On the other hand, as shown in FIGS. 5C to 5E, when the averaging time is set to 1 minute, 5 minutes, and 10 minutes, the flow and eddies of the jet can be confirmed in the average image, and the behavior of the jet can be analyzed.

Return to FIG. The calculation unit 41 calculates an average image by averaging the radar images represented by the data acquired by the acquisition unit 40 for each average time set between 1 minute and 10 minutes in order of observation time. For example, let the average time be 5 minutes. The calculation unit 41 reads radar images from the observation data 30 stored in the storage unit 23 in order of observation time, and calculates an average image obtained by averaging each radar image for 5 minutes each time 5 minutes of the observation time elapse. calculate. By averaging the radar images in this way, it is possible to identify the range of influence of the jet as an image in the average image.

The output unit 42 outputs information based on the average image calculated by the calculation unit 41 . For example, the output section 42 outputs the average image calculated by the calculation section 41 to the display section 22 . Note that the output unit 42 may output the average image data to the storage unit 23 for storage. Also, the output unit 42 may output the average image data to an external device.

Note that the calculation unit 41 may further analyze the jet flow from the average image. For example, the calculation unit 41 may further calculate one or both of the flow direction and the flow velocity of the jet by tracking the time change of the sequentially calculated average images. Further, the calculation unit 41 may specify the water temperature rise range due to the warm drainage by specifying the range in which the jet flows in the sea area from the average image obtained in sequence. The output unit 42 may output to the display unit 22 one or both of the flow direction and flow velocity of the jet, or the specified water temperature rise range, as information based on the average image.

In this way, the observation device 12 obtains data of radar images obtained by periodically observing the sea area to be observed by the radar device 11, and arranges the radar images indicated by the obtained data in the order of the observed observation time at predetermined intervals. An average image averaged for each averaging time is calculated, and information based on the calculated average image is output. Thereby, the observation device 12 can observe water surface fluctuations different from waves. In this embodiment, a jet can be observed by observing water surface fluctuations that are different from waves. For example, in a power plant, an observer can use the observation device 12 to observe a jet of hot water discharged from a water outlet, thereby estimating the range of water temperature rise caused by hot water. This makes it possible to determine whether the position of the water outlet is appropriate. In addition, for example, if there is a strong concern that the range of water temperature rise due to thermal discharge will affect the surrounding marine resources and aquatic organisms, it can be used to determine the adjustment of the power generation amount of the power plant so that the impact will not affect. can.

[Process flow]
A flow of observation processing performed by the observation device 12 according to the embodiment will be described. FIG. 6 is a flow chart showing an example of the procedure of observation processing according to the embodiment. This observation process is executed at a predetermined timing, for example, at a timing when a predetermined operation for instructing the operation unit 21 to start the observation process is performed.

The acquisition unit 40 acquires radar image data obtained by periodically observing the sea area to be observed by the radar device 11 (step S10). For example, the acquisition unit 40 acquires observation data from the radar device 11 or an external device that stores the observation data, and stores the acquired observation data as the observation data 30 in the storage unit 23 .

The calculation unit 41 calculates an average image by averaging the radar images indicated by the acquired data for each predetermined average time in order of observation time (step S11). For example, the calculation unit 41 reads the radar images from the observation data 30 stored in the storage unit 23 in order of observation time, and calculates an average image obtained by averaging the radar images whose observation time is within the average time for each average time. calculate.

The output unit 42 outputs information based on the calculated average image (step S12), and ends the process. For example, the output section 42 outputs the average image calculated by the calculation section 41 to the display section 22 .

[effect]
In this manner, the observation device 12 according to the present embodiment acquires radar image data obtained by periodically observing the sea area to be observed by the radar device 11 . The observation device 12 calculates an average image by averaging the radar images indicated by the acquired data for each predetermined average time in order of observation time. The observation device 12 outputs information based on the calculated average image. Thereby, the observation device 12 can observe water surface fluctuations different from waves. In this embodiment, a jet can be observed by observing water surface fluctuations that are different from waves.

Also, the observation device 12 sets the average time to any one of 1 minute to 10 minutes. As a result, the observation device 12 can obtain an image of water surface fluctuations different from waves while suppressing the influence of waves on the average image. In this embodiment, a clear jet image can be obtained.

Also, the radar device 11 periodically observes the observation target sea area using radio waves of any one of the X band, C band, S band, and L band. As a result, the radar device 11 can detect the shape of the water surface caused by waves and jets, and can obtain radar images that observe water surface fluctuations caused by waves and water surface fluctuations caused by jets that are different from waves.

The radar device 11 is assumed to be a marine radar device using X-band or S-band radio waves. As a result, it is possible to observe the jet using a generally available marine radar device.

The observation device 12 also outputs an average image. Thereby, the observation device 12 can observe water surface fluctuations different from waves from the average image. In this embodiment, a jet can be observed from the average image by observing water surface fluctuations different from waves from the average image.

In addition, the observation device 12 calculates one or both of the flow direction and flow velocity of the jet by tracking the temporal change in the area where scattering is obtained in the calculated average image. The observation device 12 outputs the calculated flow direction and flow velocity of the jet. Thereby, the observation device 12 can report the flow direction and flow velocity of the jet.

Now, the embodiments of the disclosed apparatus have been described so far, but the disclosed technology may be implemented in various different forms other than the embodiments described above. Therefore, other embodiments included in the present invention will be described below.

For example, in the above embodiment, by observing water surface fluctuations different from waves, the case of observing a jet of thermal wastewater discharged from the outlet of a power plant was explained as an example. Not limited. The jet flow is not limited to warm effluent, and can be observed in the same way even if the effluent is at the same temperature as or lower than the target sea area. In addition, it is not limited to observation of jets at power plants, but can be used for observation of jets at various places and facilities.

Further, in the above-described embodiment, a case of observing a jet stream by observing water surface fluctuations different from waves has been described as an example, but the disclosed apparatus is not limited to this. For example, when volcanic gas is stored on the seabed, when the gas leaks, foaming occurs, and water surface fluctuations different from waves may appear on the water surface. The technology disclosed can also be applied to such observation of water surface fluctuations. Also, in CCS (Carbon dioxide Capture and Storage) that stores carbon dioxide in geological formations, detection of gas leakage is similarly a problem. The technology disclosed can observe, for example, gas leakage at the seabed by observing water surface fluctuations that are different from waves.

Further, in the above embodiment, the calculation unit 41 reads the radar images from the observation data 30 in order of observation time, and for each average time, an average image obtained by averaging each radar image whose observation time is within the respective average time. The case of calculating is described as an example. However, the disclosed apparatus is not so limited. For example, the calculation unit 41 calculates an average image by averaging radar images whose observation time is within the average time from the start time while shifting the start time for obtaining the average for each radar image of the observation data 30 by a fixed time. You may By making the fixed time shorter than the average time, the average image can be calculated by overlapping the average times. When averaging images with overlapping averaging times are displayed consecutively, changes in the jet flow can be displayed more smoothly.

Further, as described above, the optimum averaging time for calculating the average image depends on wave conditions, radar observation conditions, and jet conditions. In addition to this, the intensity of scattering caused by waves also has an effect. In other words, if the scattering due to waves in the open ocean is small to begin with (situations where waves are not very developed), the averaging time should be set long because the impact on the observation of water surface fluctuations other than waves, such as water surface fluctuations due to jets, is small. No need. If scattering due to waves is dominant, it is necessary to set an appropriate averaging time according to the period of the waves. The calculation unit 41 may change the average time according to the conditions of the sea area to be observed and the weather conditions at the time of observation. For example, the calculation unit 41 may increase the averaging time when scattering due to waves in the observation target sea area is large, and may shorten the averaging time when scattering due to waves in the observation target sea area is small. In addition, the calculation unit 41 may obtain the wind speed as a weather condition at the time of observation, and increase the averaging time when the wind speed is high, and shorten the averaging time when the wind speed is low. Also, the average time may be set manually from outside such as the operation unit 21 .

Further, in the above embodiment, the case where the observation system 10 configured by the radar device 11 and the observation device 12 observes the jet has been described. However, the disclosed apparatus is not so limited. For example, the radar device 11 and the observation device 12 may be integrated to form an observation device. In this case, the part corresponding to the radar device 11 corresponds to the acquisition unit of the present disclosure.

Also, each component of each device illustrated is functionally conceptual, and does not necessarily need to be physically configured as illustrated. In other words, the specific state of distribution/integration of each device is not limited to the illustrated one, and all or part of them can be functionally or physically distributed/integrated in arbitrary units according to various loads and usage conditions. Can be integrated and configured. For example, the processing units of the acquisition unit 40, the calculation unit 41, and the output unit 42 may be appropriately integrated. Also, the processing of each processing unit may be separated into the processing of a plurality of processing units as appropriate. Further, each processing function performed by each processing unit may be implemented in whole or in part by a CPU and a program analyzed and executed by the CPU, or may be implemented as hardware based on wired logic. .

[Observation program]
Further, the various processes described in the above embodiments can also be realized by executing a prepared program on a computer system such as a personal computer or workstation. Therefore, an example of a computer system that executes a program having functions similar to those of the above embodiments will be described below. FIG. 7 is a diagram showing a computer that executes an observation program.

As shown in FIG. 7, the computer 300 has a CPU (Central Processing Unit) 310 , an HDD (Hard Disk Drive) 320 and a RAM (Random Access Memory) 340 . Each part of these 300 to 340 is connected via a bus 400 .

The HDD 320 stores in advance an observation program 320a that exhibits the same functions as those of the acquisition unit 40, the calculation unit 41, and the output unit 42 described above. Note that the observation program 320a may be separated as appropriate.

HDD 320 also stores various information. For example, the HDD 320 stores various data such as the observation data 30 described above.

Then, the CPU 310 reads the observation program 320a from the HDD 320 and executes it, thereby executing the same operation as each processing unit of the embodiment. That is, the observation program 320a performs the same operations as those of the acquisition unit 40, the calculation unit 41, and the output unit 42. FIG.

Note that the observation program 320a described above does not necessarily have to be stored in the HDD 320 from the beginning.

For example, the program is stored in a “portable physical medium” such as a flexible disk (FD), CD-ROM, DVD disk, magneto-optical disk, IC card, etc. inserted into the computer 300 . Then, the computer 300 may read and execute the programs from these.

Furthermore, the program is stored in "another computer (or server)" or the like connected to the computer 300 via a public line, Internet, LAN, WAN, or the like. Then, the computer 300 may read and execute the programs from these.

10 Observation System 11 Radar Device 12 Observation Device 20 External Interface Part 21 Operation Part 22 Display Part 23 Storage Part 24 Control Part 30 Observation Data 40 Acquisition Part 41 Calculation Part 42 Output Part

Claims (10)

Acquiring radar image data obtained by periodically observing the sea area to be observed by a radar device using radio waves with a wavelength of 0.01 m to 2 m,
Calculating an average image by averaging the radar image indicated by the acquired data for each predetermined average time in order of observation time,
An observation program that causes a computer to execute a process of outputting information based on the calculated average image. 2. The observation program according to claim 1, wherein the average time is any one of 1 minute to 10 minutes. 3. The observation program according to claim 1, wherein the radar device periodically observes the sea area to be observed using radio waves of any one of X band, C band, S band, and L band. . The observation program according to claim 1 or 2, wherein the radar device is a marine radar device using X-band or S-band radio waves. The observation program according to any one of claims 1 to 4, wherein the output processing outputs the average image. causing the computer to further execute a process of calculating one or both of the flow direction and flow velocity of the jet by tracking the temporal change in the area where scattering is obtained in the calculated average image;
The observation program according to any one of claims 1 to 5, wherein the output processing outputs one or both of the calculated flow direction and flow velocity of the jet. The observation program according to any one of claims 1 to 6, further causing a computer to execute a process of changing the average time according to the situation of the sea area to be observed and the weather conditions at the time of observation. . Acquiring radar image data obtained by periodically observing the sea area to be observed by a radar device using radio waves with a wavelength of 0.01 m to 2 m,
Calculating an average image by averaging the radar image indicated by the acquired data for each predetermined average time in order of observation time,
An observation method, wherein a computer executes a process of outputting information based on the calculated average image. an acquisition unit that acquires radar image data obtained by periodically observing a sea area to be observed by a radar device that uses radio waves with a wavelength of 0.01 m to 2 m;
a calculation unit that calculates an average image obtained by averaging the radar images indicated by the data acquired by the acquisition unit for each predetermined average time in order of observation time;
an output unit that outputs information based on the average image calculated by the calculation unit;
An observation device characterized by having A radar device that periodically observes using radio waves with a wavelength of 0.01 m to 2 m and generates data of the observed radar image;
an acquisition unit for acquiring data of radar images obtained by periodically observing a sea area to be observed by the radar apparatus; an observation device having a calculation unit that calculates an average image averaged for each, and an output unit that outputs information based on the average image calculated by the calculation unit;
An observation system comprising:

Images