CN108363057A - Synthetic aperture radar detection method, device and storage medium - Google Patents

Abstract

The present disclosure relates to a synthetic aperture radar detection method, apparatus and storage medium, the method comprising: determining a detection area, wherein the detection area at least comprises an area where an object to be observed is located; determining the scanning times N of the synthetic aperture radar scanning the detection area, and determining the observation angle of each scanning in the N scanning times, wherein N is a positive integer greater than 1; and when the synthetic aperture radar passes through the detection area, scanning the detection area according to the scanning times and the observation angle of each scanning to obtain a target image. The scheme in the disclosure can carry out all-around observation on the detection area, and improves the detection capability of the synthetic aperture radar.

Description

Synthetic aperture radar detection method, device and storage medium

technical field

The present disclosure relates to the field of radar technology, and in particular, to a synthetic aperture radar detection method, device and storage medium.

Background technique

Synthetic Aperture Radar (SAR), as an active aviation and aerospace remote sensing method, has the characteristics of high resolution, continuous work day and night, and wide coverage area. Therefore, it is widely used in environmental protection, target monitoring, military exploration and other fields, and has become one of the most important means for high-resolution earth observation and global resource management.

In related technologies, the SAR system has developed a variety of different working modes according to the requirements of different application fields: such as strip type, scanning type, spotlight type, etc., and these working modes are to scan and image an area once. However, even though synthetic aperture radar is not affected by the alternation of day and night and the intensity of light compared to optical radar, it can penetrate clouds and even part of the cover. The SAR system is still unable to conduct comprehensive observation and identification of complex targets.

Contents of the invention

In order to solve the technical problems existing in related technologies, the present disclosure provides a synthetic aperture radar detection method, device and storage medium.

According to a first aspect of an embodiment of the present disclosure, a synthetic aperture radar detection method is provided, the method comprising:

Determining the detection area, the detection area at least includes the area where the target to be observed is located;

Determining the number of scans N for the synthetic aperture radar to scan the detection area, and determining the observation angle of each scan in the N scans, where N is a positive integer greater than 1;

When the synthetic aperture radar passes through the detection area, the detection area is scanned according to the number of scans and the observation angle of each scan to obtain a target image.

Optionally, the observation angle includes a side view angle and an oblique view angle, and the determination of the observation angle of each scan in the N scans includes:

According to the relative position of the target to be observed and the orbit of the synthetic aperture radar, determine the side angle of view at which the center of the beam of the synthetic aperture radar irradiates the target to be observed, wherein each scan in the N times of scanning the same side angle of view;

According to the characteristic parameters of the object to be observed, the oblique angle of each scan in the N scans is determined.

Optionally, the determining the oblique angle of each scan in the N scans according to the characteristic parameters of the target to be observed includes:

determining the variation range of the oblique angle of view of the synthetic aperture radar according to the characteristic parameters of the target to be observed;

The variation range of the oblique angle is divided into N equal parts, and the oblique angle of each scan is determined.

Optionally, the scanning of the detection area according to the number of scans and the observation angle of each scan to obtain a target image includes:

Obtain N scan images corresponding to N scans;

performing image fusion on the N scanned images to obtain the target image.

Optionally, after the target image is obtained, the method further includes:

performing image processing on the target image;

Target recognition is performed on the image-processed target image to detect the target to be observed.

Optionally, the method also includes:

When scanning an area to be scanned other than the detection area, the synthetic aperture radar is controlled to scan and image the area to be scanned once.

According to a second aspect of an embodiment of the present disclosure, a synthetic aperture radar detection device is provided, the device comprising:

An area determination module, configured to determine a detection area, the detection area at least including the area where the target to be observed is located;

A processing module, configured to determine the number of scans N of the detection area scanned by the synthetic aperture radar, and determine the observation angle of each scan in the N scans, where N is a positive integer greater than 1;

The image acquisition module scans the detection area according to the number of scans and the observation angle of each scan when the synthetic aperture radar passes through the detection area to obtain a target image.

Optionally, the viewing angle includes a side viewing angle and an oblique viewing angle, and the processing module includes:

The side angle of view determination submodule is used to determine the side angle of view at which the center of the beam of the synthetic aperture radar irradiates the target to be observed according to the relative position of the target to be observed and the orbit of the synthetic aperture radar, wherein the The side angle of view of each scan in the above N scans is the same;

The oblique angle determination submodule is configured to determine the oblique angle of each of the N scans according to the characteristic parameters of the object to be observed.

Optionally, the oblique angle determination submodule includes:

The first determination submodule is used to determine the variation range of the oblique angle of view of the synthetic aperture radar according to the characteristic parameters of the target to be observed;

The second determination sub-module is configured to divide the variation range of the oblique angle into N equal parts, and determine the oblique angle of each scan.

Optionally, the image acquisition module includes:

The first acquiring submodule is used to acquire N scan images corresponding to N scans;

The second acquisition sub-module is configured to perform image fusion on the N scan images to obtain the target image.

Optionally, the device also includes:

An image processing module, configured to perform image processing on the target image;

The recognition module is used for performing target recognition on the target image after image processing, so as to detect the target to be observed.

Optionally, the device also includes:

The control module is configured to control the synthetic aperture radar to scan and image the area to be scanned once when scanning the area to be scanned other than the detection area.

According to a third aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium, on which computer program instructions are stored, and when the program instructions are executed by a processor, the steps in the synthetic aperture radar detection method provided in the first aspect of the present disclosure are implemented. step.

According to a fourth aspect of an embodiment of the present disclosure, a synthetic aperture radar detection device is provided, the device comprising:

The computer-readable storage medium provided by the third aspect of the present disclosure; and

One or more processors for executing the program in the computer-readable storage medium.

In the present disclosure, when the synthetic aperture radar passes above the detection area, it scans the detection area multiple times, and the observation angles of each scan are different. In this way, the target image of the detection area is obtained through multiple multi-angle scans, which can All-round observation of the detection area improves the detection capability of the synthetic aperture radar.

Other features and advantages of the present disclosure will be described in detail in the detailed description that follows.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present disclosure, and constitute a part of the description, together with the following specific embodiments, are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the attached picture:

Fig. 1 is a flow chart of a synthetic aperture radar detection method according to an exemplary embodiment of the present disclosure.

Fig. 2 is a schematic diagram of an object to be observed including multiple scattering centers shown for an exemplary embodiment of the present disclosure.

Fig. 3 is a schematic diagram of a detection area shown in an exemplary embodiment of the present disclosure.

Fig. 4 is a schematic diagram of parameters of a spaceborne synthetic aperture radar shown in an exemplary embodiment of the present disclosure.

Fig. 5 is a schematic diagram showing an oblique view according to an exemplary embodiment of the present disclosure.

Fig. 6 is a flowchart of a synthetic aperture radar detection method according to an exemplary embodiment of the present disclosure.

Fig. 7 is a schematic diagram of a synthetic aperture radar detection device according to an exemplary embodiment of the present disclosure.

Detailed ways

Specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

As shown in FIG. 1 , it is a flowchart of a synthetic aperture radar detection method according to an exemplary embodiment of the present disclosure, and the method includes the following steps.

In step S11, the detection area is determined, and the detection area includes at least the area where the target to be observed is located;

In step S12, determine the number of scans N for the synthetic aperture radar to scan the detection area, and determine the observation angle of each scan in the N scans, where N is a positive integer greater than 1;

In step S13, when the synthetic aperture radar passes through the detection area, the detection area is scanned according to the number of scans and the observation angle of each scan to obtain a target image.

It should be understood that the synthetic aperture radar can be an airborne synthetic aperture radar or a spaceborne synthetic aperture radar. In order to better understand the synthetic aperture radar detection method provided in the present disclosure, here we take the spaceborne synthetic aperture radar as an example. Be explained.

In the present disclosure, the target to be observed may be a building or bunker with a shelter or a complex structure, such as a tall building, a mountain, an earthquake ruin, and the like. The object to be observed may also be an object having multiple scattering centers, as shown in FIG. 2 , which is a schematic diagram of an object to be observed including multiple scattering centers according to an exemplary embodiment of the present disclosure. The detection area is an area including at least the object to be observed. In one embodiment, the detection area is the area where the target to be observed is located. In another embodiment, the detection area includes the area where the object to be observed is located, and the distance to the object to be observed is less than or equal to a preset distance.

The determination of the detection area may be selected by the user according to actual needs. For example, the synthetic aperture radar first obtains a scanning image, which can be collected under any working mode of the synthetic aperture radar (for example: strip working mode, scanning working mode, spotlight mode, etc. ), the user determines the detection area that needs to be observed from multiple angles on the scanned image. Please refer to FIG. 3 , which is a schematic diagram of a detection area shown in an exemplary embodiment of the present disclosure. In FIG. 3 , the target B is blocked by the target A, and the target B can be regarded as the target to be observed, and the circular area where the target B is located can be determined as the detection area.

In the present disclosure, the number of scans N of the detection area may be preset, for example, the default number of scans is 10. The number of scans N can also be automatically selected according to the range of the detection area. For example, when the range of the detection area is large, the number of scans N is also large, and when the range of the detection area is small, the number of scans N can be appropriately reduced. Of course, the number of scans N may also be determined in other manners, which is not limited in the present disclosure. It should be understood that, in order to ensure the working efficiency of the SAR, the number of scans may be limited, such as 5<N<15.

When the synthetic aperture radar scans the detection area N times, each scan has a corresponding observation angle. The observation angle of the N scans can be set according to actual needs. The observation angles of the N scans can be the same or different. In one embodiment, the observation angles of the N scans are different. In each scan, the synthetic aperture radar emits a beam to the detection area and collects an echo. In this way, it works N times. Images of the detection area can be captured from different azimuths.

After determining the number of scans N and the observation angle of each scan, the spaceborne synthetic aperture radar is controlled to scan the detection area to obtain the target image, in which the multi-directional information of the target to be observed can be obtained.

In this disclosure, when the spaceborne synthetic aperture radar passes over the detection area once, it can scan the detection area multiple times intermittently and at different observation angles to obtain multi-directional information of the detection area, while the synthetic aperture radar in the related art When passing through the detection area once, only one scanning imaging of the detection area can be realized, and the scanning result is only the imaging result of one side. Therefore, the solution in the present disclosure can realize all-round observation of the detection area and improve the detection capability of the synthetic aperture radar.

Optionally, the observation angle includes a side view angle and an oblique view angle, and the determination of the observation angle of each scan in the N scans includes:

According to the relative position of the target to be observed and the orbit of the synthetic aperture radar, determine the side angle of view at which the center of the beam of the synthetic aperture radar irradiates the target to be observed, wherein each scan in the N times of scanning the same side angle of view;

According to the characteristic parameters of the object to be observed, the oblique angle of each scan in the N scans is determined.

As shown in FIG. 4 , it is a schematic diagram of parameters of a spaceborne synthetic aperture radar shown in an exemplary embodiment of the present disclosure. Please refer to Figure 4. The orbit direction of the spaceborne synthetic aperture radar is the azimuth direction, the side viewing angle is the included angle of the antenna viewing angle projected on the range plane, and the oblique viewing angle is the included angle of the antenna viewing angle projected on the slant range plane. In this embodiment, the observation angle includes a side view angle and an oblique angle view. For each scan, the side view angle is the same, and the oblique angle view can be different.

It should be understood that the characteristic parameters of the target to be observed may be parameters such as height, shape, and orientation of the target to be observed. In one embodiment, the target to be observed is a mountain body, and the mountain body is blocked by another mountain body. According to the positional relationship between the mountain body to be observed and the orbit of the synthetic aperture radar, a side view angle is determined, and the side view angle can ensure that the beam scans to the area where the mountain body is located. . In addition, according to the characteristic parameters such as the height of the mountain to be observed and the occluded surface, the oblique viewing angle of each scan is adjusted. In one embodiment, it is at least ensured that the beam of the synthetic aperture radar can scan the occluded surface area once.

Of course, the side view angle of each scan can also be adjusted according to actual needs, and the side view angles of N scans can also be different, which is not specifically limited in the present disclosure.

Optionally, the determining the oblique angle of view of each of the N scans according to the characteristic parameters of the target to be observed includes: determining the oblique angle of the synthetic aperture radar according to the characteristic parameters of the target to be observed Angle of view variation range: Divide the oblique angle of view variation range into N equal parts, and determine the oblique angle of each scan.

It should be understood that when the side viewing angles of the N scans are the same, a slant range plane can be determined according to the SAR orbit and the side viewing angle. Please refer to Figure 4. Adjust on the plane. In one embodiment, when the spaceborne synthetic aperture radar moves along the orbit, the positions of the spaceborne synthetic aperture radar are different, and the oblique angles at which the detection area can be scanned are also different. Therefore, it can be determined on the slant range plane. The change range of the oblique angle of the detection area.

In the present disclosure, the oblique angle of view of each scan can be determined in various ways, as shown in FIG. 5 , which is a schematic diagram of the oblique angle of view shown in an exemplary embodiment of the present disclosure. In this embodiment, the number of scans N is first determined, The number of scans can be preset or selected according to the size of the detection area. Divide the change range of the oblique angle into N equal parts to determine the oblique angle of each scan. Taking the changing range of the squint angle as -30°～60° and N as 9 as an example, divide the range of the squint angle into 9 equal parts, then adjust the angle of view by 10° for each scan, then when the initial angle of view of the synthetic aperture radar is When -30°, the oblique angle of the first scan is adjusted to -20°, the oblique angle of the second scan is adjusted to -10°, the oblique angle of the third scan is adjusted to 0°, and so on. In another embodiment, the oblique angle of each scan may be any angle capable of scanning to the detection area.

Optionally, the scanning the detection area according to the number of scans and the observation angle of each scan to obtain the target image includes: obtaining N scan images corresponding to N scans; performing image fusion on the scanned images to obtain the target image.

In this disclosure, every time the spaceborne synthetic aperture radar performs a scan, a scan image is generated. In order to obtain the multi-directional information of the detection area and the information of the surrounding objects in one image, the N scan images can be reasonably and effectively fusion to obtain the target image. In one embodiment, multi-angle images can be integrated for information such as scattering characteristics of corresponding objects to be observed in different scanning images. The method of image fusion can be set according to actual needs, such as weighted average method, wavelet transform method, etc., which are not limited in the present disclosure.

Optionally, after the target image is obtained, the method further includes: performing image processing on the target image; and performing target recognition on the image-processed target image, so as to detect the target to be observed.

It should be understood that compared with the image formed by one shot, the fused target image has defects such as large noise and splicing dislocation. Therefore, it is necessary to perform some post-processing on the target image, such as filtering, splicing correction, etc., to obtain the image after image processing. After processing the target image, image interpretation and target recognition can be performed on the processed target image to obtain the information of the detection area.

Optionally, the method further includes: when scanning an area to be scanned other than the detection area, controlling the synthetic aperture radar to scan and image the area to be scanned once.

In this disclosure, if multiple scans are required for all areas, the work efficiency of the spaceborne synthetic aperture radar will be greatly reduced. Therefore, in order to ensure efficiency, multi-angle scans can be used for the detection area, and existing scans can be used for other areas. The working mode (such as strip working mode, scanning working mode, spotlight mode) is used to scan and image once.

In order to better understand the synthetic aperture radar detection method provided by the present disclosure, as shown in FIG. 6 , it is a flowchart of a synthetic aperture radar detection method shown in an exemplary embodiment of the present disclosure, including the following steps:

Step S61, determining the detection area;

Step S62, designing the working mode of the synthetic aperture radar;

Step S63, controlling the synthetic aperture radar to scan the detection area in the working mode to obtain multiple scanned images;

Step S64, performing multi-angle image fusion on the multiple scanned images to obtain a fusion image;

Step S65, performing post-processing on the fused image to obtain a processed fused image;

Step S66, performing target recognition on the processed fused image.

In this embodiment, designing the working mode of the synthetic aperture includes designing the number of scans to scan the detection area, and the side view angle and oblique view angle of each scan.

In this disclosure, when the detection area needs to be scanned multiple times, it is only necessary to adjust the oblique angle of the launch beam of the spaceborne synthetic aperture radar antenna, so there is no need to redevelop new functions, which can be realized by almost all SAR satellites at present , there is no need to launch new satellites for this purpose, and it has strong versatility. In addition, occluded targets or targets with complex scattering characteristics are very common in actual observation, so the synthetic aperture radar detection method provided in the present disclosure has strong practicability.

As shown in FIG. 7 , it is a schematic diagram of a synthetic aperture radar detection device shown in an exemplary embodiment of the present disclosure, and the device includes:

An area determination module 71, configured to determine a detection area, the detection area at least including the area where the target to be observed is located;

The processing module 72 is used to determine the number of scans N of the detection area scanned by the synthetic aperture radar, and to determine the observation angle of each scan in the N scans, where N is a positive integer greater than 1;

The image acquisition module 73 scans the detection area according to the number of scans and the observation angle of each scan when the synthetic aperture radar passes through the detection area to obtain a target image.

Optionally, the viewing angles include side viewing angles and oblique viewing angles, and the processing module 72 includes:

The side angle of view determination submodule is used to determine the side angle of view at which the center of the beam of the synthetic aperture radar irradiates the target to be observed according to the relative position of the target to be observed and the orbit of the synthetic aperture radar, wherein the The side angle of view of each scan in the above N scans is the same;

The oblique angle determination submodule is configured to determine the oblique angle of each of the N scans according to the characteristic parameters of the object to be observed.

Optionally, the oblique angle determination submodule includes:

The first determination submodule is used to determine the variation range of the oblique angle of view of the synthetic aperture radar according to the characteristic parameters of the target to be observed;

The second determination sub-module is configured to divide the variation range of the oblique angle into N equal parts, and determine the oblique angle of each scan.

Optionally, the image acquisition module 73 includes:

The first acquiring submodule is used to acquire N scan images corresponding to N scans;

The second acquisition sub-module is configured to perform image fusion on the N scan images to obtain the target image.

Optionally, the device also includes:

An image processing module, configured to perform image processing on the target image;

The recognition module is used for performing target recognition on the target image after image processing, so as to detect the target to be observed.

Optionally, the device also includes:

The control module is configured to control the synthetic aperture radar to scan and image the area to be scanned once when scanning the area to be scanned other than the detection area.

Based on the same idea, the present disclosure also provides a computer-readable storage medium on which computer program instructions are stored, and when the program instructions are executed by a processor, the steps in the synthetic aperture radar detection method provided in the present disclosure are implemented.

Based on the same idea, the present disclosure also provides a synthetic aperture radar detection device, which includes: the computer-readable storage medium provided by the present disclosure; and one or more processors, configured to execute the program of.

The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure. These simple modifications all belong to the protection scope of the present disclosure.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner if there is no contradiction. The combination method will not be described separately.

In addition, various implementations of the present disclosure can be combined arbitrarily, as long as they do not violate the idea of the present disclosure, they should also be regarded as the content disclosed in the present disclosure.

Claims (9)

1. A synthetic aperture radar detection method, characterized in that the method comprises: Determining the detection area, the detection area at least includes the area where the target to be observed is located; Determining the number of scans N for the synthetic aperture radar to scan the detection area, and determining the observation angle of each scan in the N scans, where N is a positive integer greater than 1; When the synthetic aperture radar passes through the detection area, the detection area is scanned according to the number of scans and the observation angle of each scan to obtain a target image. 2. the synthetic aperture radar detection method according to claim 1, is characterized in that, described observation angle comprises side angle of view and oblique angle of view, and the observation angle of each scanning in the described determination N scans, comprises: According to the relative position of the target to be observed and the orbit of the synthetic aperture radar, determine the side angle of view at which the center of the beam of the synthetic aperture radar irradiates the target to be observed, wherein each scan in the N times of scanning the same side angle of view; According to the characteristic parameters of the object to be observed, the oblique angle of each scan in the N scans is determined. 3. the synthetic aperture radar detection method according to claim 2, is characterized in that, described according to the characteristic parameter of described target to be observed, determines the oblique angle of view of each scanning in described N times scanning, comprises: determining the variation range of the oblique angle of view of the synthetic aperture radar according to the characteristic parameters of the target to be observed; The variation range of the oblique angle is divided into N equal parts, and the oblique angle of each scan is determined. 4. The synthetic aperture radar detection method according to claim 1, wherein the scanning of the detection area according to the number of scans and the observation angle of each scan to obtain a target image comprises: Obtain N scan images corresponding to N scans; performing image fusion on the N scanned images to obtain the target image. 5. the synthetic aperture radar detection method according to claim 1, is characterized in that, after described obtaining target image, described method also comprises: performing image processing on the target image; Target recognition is performed on the image-processed target image to detect the target to be observed. 6. The synthetic aperture radar detection method according to claim 1, is characterized in that, described method also comprises: When scanning an area to be scanned other than the detection area, the synthetic aperture radar is controlled to scan and image the area to be scanned once. 7. A synthetic aperture radar detection device, characterized in that the device comprises: An area determination module, configured to determine a detection area, the detection area at least including the area where the target to be observed is located; A processing module, configured to determine the number of scans N of the detection area scanned by the synthetic aperture radar, and determine the observation angle of each scan in the N scans, where N is a positive integer greater than 1; The image acquisition module scans the detection area according to the number of scans and the observation angle of each scan when the synthetic aperture radar passes through the detection area to obtain a target image. 8. A computer-readable storage medium, on which computer program instructions are stored, wherein, when the program instructions are executed by a processor, the steps of the method according to any one of claims 1-6 are implemented. 9. A synthetic aperture radar detection device, characterized in that the device comprises: the computer-readable storage medium as claimed in claim 8; and One or more processors for executing the program in the computer-readable storage medium.