CN108363057B - Synthetic aperture radar detection method, synthetic aperture radar detection device and storage medium - Google Patents
Synthetic aperture radar detection method, synthetic aperture radar detection device and storage medium Download PDFInfo
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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
Technical Field
The present disclosure relates to the field of radar technologies, and in particular, to a synthetic aperture radar detection method, apparatus, and storage medium.
Background
Synthetic Aperture Radar (SAR) is an active aviation and aerospace remote sensing means, and has the characteristics of high resolution, continuous work day and night, wide coverage area and the like. Therefore, the method has wide application in the fields of environmental protection, target monitoring, military exploration and the like, and is one of the most important means of high-resolution earth observation and global resource management at present.
In the related art, the SAR system develops a plurality of different working modes aiming at different application field requirements: such as stripe, scan, beam, etc., which are used to image a region in a single scan. However, even though the synthetic aperture radar is not affected by day and night alternation and light intensity compared with an optical radar, the synthetic aperture radar can penetrate through the cloud layer and even part of the covering, but for a complex shielding object with larger thickness and volume or a complex target with multiple scattering centers, the SAR system still cannot carry out comprehensive observation and identification.
Disclosure of Invention
To solve technical problems in the related art, the present disclosure provides a synthetic aperture radar detection method, apparatus, and storage medium.
According to a first aspect of embodiments of the present disclosure, there is provided a synthetic aperture radar detection method, 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.
Optionally, the determining the observation angle for each of the N scans includes:
determining a side view angle of a beam center of the synthetic aperture radar irradiating the target to be observed according to the relative position of the target to be observed and the operation track of the synthetic aperture radar, wherein the side view angles of each scanning in the N times of scanning are the same;
and determining the squint angle of each scanning in the N times of scanning according to the characteristic parameters of the target to be observed.
Optionally, the determining, according to the characteristic parameter of the target to be observed, an oblique angle of each scanning in the N scans includes:
determining the variation range of the squint angle of the synthetic aperture radar according to the characteristic parameters of the target to be observed;
dividing the variation range of the oblique angle into N equal parts, and determining the oblique angle of each scanning.
Optionally, the scanning the detection region according to the number of times of scanning and the observation angle of each scanning to obtain a target image includes:
obtaining N scanning images corresponding to N times of scanning;
and carrying out image fusion on the N scanning images to obtain the target image.
Optionally, after the obtaining the target image, the method further comprises:
performing image processing on the target image;
and carrying out target identification on the target image subjected to image processing so as to detect the target to be observed.
Optionally, the method further comprises:
and when scanning the area to be scanned outside the detection area, controlling the synthetic aperture radar to perform primary scanning imaging on the area to be scanned.
According to a second aspect of embodiments of the present disclosure, there is provided a synthetic aperture radar detection apparatus, the apparatus comprising:
the system comprises a region determining module, a region determining module and a detecting module, wherein the region determining module is used for determining a detection region, and the detection region at least comprises a region where a target to be observed is located;
the processing module is used for 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 the image acquisition module is used for scanning the detection area according to the scanning times and the observation angle of each scanning when the synthetic aperture radar passes through the detection area to obtain a target image.
Optionally, the observation angle includes a lateral view angle and an oblique view angle, and the processing module includes:
the side view angle determining submodule is used for determining a side view angle of the synthetic aperture radar irradiated by the beam center of the synthetic aperture radar according to the relative position of the target to be observed and the operation track of the synthetic aperture radar, wherein the side view angles of scanning in each time in the N times of scanning are the same;
and the squint angle determining submodule is used for determining the squint angle of each scanning in the N times of scanning according to the characteristic parameters of the target to be observed.
Optionally, the squint angle determination sub-module includes:
the first determining submodule is used for determining the squint angle change range of the synthetic aperture radar according to the characteristic parameters of the target to be observed;
and the second determining submodule is used for dividing the variation range of the squint angle into N equal parts and determining the squint angle of each scanning.
Optionally, the image acquisition module includes:
the first acquisition submodule is used for acquiring N scanning images corresponding to N times of scanning;
and the second acquisition sub-module is used for carrying out image fusion on the N scanning images to obtain the target image.
Optionally, the apparatus further comprises:
the image processing module is used for carrying out image processing on the target image;
and the identification module is used for carrying out target identification on the target image subjected to image processing so as to detect the target to be observed.
Optionally, the apparatus further comprises:
and the control module is used for controlling the synthetic aperture radar to perform one-time scanning imaging on the area to be scanned when the area to be scanned outside the detection area is scanned.
According to a third aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps in the synthetic aperture radar detection method provided by the first aspect of the present disclosure.
According to a fourth aspect of embodiments of the present disclosure, there is provided a synthetic aperture radar detection apparatus, the apparatus comprising:
a computer-readable storage medium provided by a third aspect of the disclosure; and
one or more processors to execute the program in the computer-readable storage medium.
In this disclosure, synthetic aperture radar is when passing through the detection zone top, right the detection zone carries out scanning many times, and the observation angle of scanning at every turn is different, like this, obtains the target image of detection zone through many times multi-angle scanning, can carry out all-round observation to the detection zone, has improved synthetic aperture radar's detectability.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart illustrating a method for synthetic aperture radar detection in an exemplary embodiment of the present disclosure.
Fig. 2 is a schematic diagram of an object to be observed including a plurality of scattering centers, shown for an exemplary embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a detection zone according to an exemplary embodiment of the present disclosure.
Fig. 4 is a parameter diagram of a satellite-borne synthetic aperture radar according to an exemplary embodiment of the present disclosure.
Fig. 5 is a schematic diagram illustrating an oblique view according to an exemplary embodiment of the present disclosure.
Fig. 6 is a flowchart illustrating 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 Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1, a flowchart of a method for synthetic aperture radar detection is shown for an exemplary embodiment of the present disclosure, the method comprising the following steps.
In step S11, determining a detection region, where the detection region at least includes a region where an object to be observed is located;
in step S12, determining the scanning times N of the synthetic aperture radar scanning the detection area, and determining the observation angle of each scanning of N scanning, 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, so as to obtain a target image.
It should be understood that the synthetic aperture radar may be an airborne synthetic aperture radar, and may also be a satellite-borne synthetic aperture radar, and for better understanding of the synthetic aperture radar detection method provided by the present disclosure, the satellite-borne synthetic aperture radar is taken as an example for description.
In the present disclosure, the object to be observed may be a building or a shelter having a shelter or a complicated structure, such as a tall building, a mountain, an earthquake ruin, and the like. The target to be observed may also be a target having a plurality of scattering centers, as shown in fig. 2, which is a schematic diagram of a target to be observed including a plurality of scattering centers according to an exemplary embodiment of the present disclosure. The detection area is an area at least containing the target to be observed. In one embodiment, the detection region is the region where the target to be observed is located. In another embodiment, the detection region is a region range including a region where the target to be observed is located, and a distance between the detection region and the target to be observed is less than or equal to a preset distance.
The determination of the detection area can be selected by the user according to actual needs. For example, the synthetic aperture radar first obtains a scanning image, which may be acquired in any operation mode of the synthetic aperture radar (e.g., a strip mode, a scanning mode, a beam mode, etc.), and a user determines a detection region to be observed from multiple angles on the scanning image. Referring to fig. 3, a schematic diagram of a detection region is shown in an exemplary embodiment of the present disclosure. In fig. 3, the target B is covered by the target a, the target B may be the target to be observed, and the circular area where the target B is located may be determined as the detection area.
In the present disclosure, the number of scanning times N for the detection region may be preset, for example, the default number of scanning times is 10. The number of scanning times N may also be automatically selected according to the range of the detection region, for example, when the range of the detection region is large, the number of scanning times N is also large, and when the range of the detection region is small, the number of scanning times N may be appropriately reduced. Of course, the number of scanning times N may also be determined according to other manners, which is not limited in this disclosure. It will be appreciated that in order to ensure the efficiency of the synthetic aperture radar operation, the number of scans may be limited, such as 5 < N < 15.
When the synthetic aperture radar scans a detection area for N times, each scanning has a corresponding observation angle, the observation angles of the N times of scanning can be set according to actual needs, and the observation angles of the N times of scanning can be the same or different. In one embodiment, the observation angles of the N scans are different, and in each scan, the synthetic aperture radar transmits a beam to the detection area once and collects an echo, and by operating N times, images of the detection area can be shot from different azimuth angles.
After the scanning times N and the observation angle of each scanning are determined, the satellite-borne synthetic aperture radar is controlled to scan the detection area, a target image is obtained, and multi-azimuth information of the target to be observed can be obtained in the target image.
In the disclosure, when the satellite-borne synthetic aperture radar passes through the detection area for one time, the satellite-borne synthetic aperture radar can scan the detection area for multiple times at different observation angles to obtain multi-directional information of the detection area, while the synthetic aperture radar in the related art can only realize one-time scanning imaging of the detection area when passing through the detection area for one time, and the scanning result is only the imaging result of one side. Therefore, the scheme in the disclosure can realize omnibearing observation on the detection area, and improves the detection capability of the synthetic aperture radar.
Optionally, the determining the observation angle for each of the N scans includes:
determining a side view angle of a beam center of the synthetic aperture radar irradiating the target to be observed according to the relative position of the target to be observed and the operation track of the synthetic aperture radar, wherein the side view angles of each scanning in the N times of scanning are the same;
and determining the squint angle of each scanning in the N times of scanning according to the characteristic parameters of the target to be observed.
As shown in fig. 4, a parameter diagram of a satellite-borne synthetic aperture radar is shown for an exemplary embodiment of the present disclosure. Referring to fig. 4, the orbit direction of the space-borne synthetic aperture radar is the azimuth direction, the side view angle is the angle of the projection of the antenna view angle on the distance plane, and the squint angle is the angle of the projection of the antenna view angle on the squint plane. In this embodiment, the viewing angle includes a side viewing angle that is the same for each scan and an oblique viewing angle that may be different.
It should be understood that the characteristic parameter of the target to be observed may be a height, a shape, an orientation, and the like of the target to be observed. In one embodiment, the target to be observed is a mountain, the mountain is shielded by another mountain, and a side viewing angle is determined according to the position relation between the mountain to be observed and the synthetic aperture radar running track, wherein the side viewing angle can ensure that the wave beam scans the area where the mountain is located. In addition, the squint angle of each scanning is adjusted according to the characteristic parameters of the height of the mountain to be observed, the shielded surface and the like, and in one embodiment, the beam of the synthetic aperture radar is at least ensured to be capable of scanning the shielded surface area once.
Of course, the side viewing angle of each scan can also be adjusted according to actual needs, and the side viewing angles of N scans can also be different, and the disclosure is not particularly limited.
Optionally, the determining, according to the characteristic parameter of the target to be observed, an oblique angle of each scanning in the N scans includes: determining the variation range of the squint angle of the synthetic aperture radar according to the characteristic parameters of the target to be observed; dividing the variation range of the oblique angle into N equal parts, and determining the oblique angle of each scanning.
It should be understood that when the side view angles of the N scans are the same, a slope plane may be determined according to the operation orbit and the side view angle of the synthetic aperture radar, and referring to fig. 4, the slope angle of the transmission beam of the synthetic aperture radar may be adjusted on the slope plane. In one embodiment, when the satellite-borne synthetic aperture radar moves along the operation track, the position of the satellite-borne synthetic aperture radar is different, and the squint angle capable of scanning the detection area is also different, so that the variation range of the squint angle capable of scanning the detection area can be determined on the slant range plane.
In the present disclosure, the squint angle of each scan may be determined in various ways, as shown in fig. 5, which is a schematic view of the squint angle shown in an exemplary embodiment of the present disclosure, in this embodiment, the scan number N is first determined, and the scan number may be preset or may be selected according to the size of the detection region range. And dividing the variation range of the squint angle by N equal parts, and determining the squint angle of each scanning. Taking the change range of the oblique angle as-30-60 degrees and N as 9 as an example, dividing the change range of the oblique angle by 9 equal parts, adjusting the oblique angle by 10 degrees in each scanning, adjusting the oblique angle of the first scanning to-20 degrees, the oblique angle of the second scanning to-10 degrees, the oblique angle of the third scanning to 0 degrees when the initial oblique angle of the synthetic aperture radar is-30 degrees, and so on. In another embodiment, the oblique viewing angle of each scan may be any angle that can scan the detection region.
Optionally, the scanning the detection region according to the number of times of scanning and the observation angle of each scanning to obtain a target image includes: obtaining N scanning images corresponding to N times of scanning; and carrying out image fusion on the N scanning images to obtain the target image.
In the method, a satellite-borne synthetic aperture radar generates a scanning image every time scanning is performed, and in order to obtain multi-azimuth information of a detection area and information of surrounding objects in one image, N scanning images can be reasonably and effectively fused to obtain the target image. In one embodiment, the multi-angle images can be integrated according to the scattering characteristics and other information of the corresponding target to be observed in different scanning images. The image fusion method may be set according to actual needs, for example, a weighted average method, a wavelet transform method, and the like, and the disclosure is not limited thereto.
Optionally, after the obtaining the target image, the method further comprises: performing image processing on the target image; and carrying out target identification on the target image subjected to image processing so as to detect the target to be observed.
It should be understood that the fused target image has defects of large noise, misalignment of stitching, and the like compared with an image formed by shooting at one time, and therefore, some post-processing, such as filtering, stitching correction, and the like, needs to be performed on the target image to obtain the target image after image processing, and then, the processed target image can be subjected to image interpretation and target recognition to obtain information of a detection region.
Optionally, the method further comprises: and when scanning the area to be scanned outside the detection area, controlling the synthetic aperture radar to perform primary scanning imaging on the area to be scanned.
In the present disclosure, if all areas need to be scanned for multiple times, the working efficiency of the space-borne synthetic aperture radar is greatly reduced, and therefore, in order to ensure the efficiency, the detection area can be scanned at multiple angles, and other areas still adopt the existing working modes (such as a strip mode working mode, a scanning mode working mode, and a beam-focusing mode) to perform scanning imaging for one time.
For better understanding of the synthetic aperture radar detection method provided by the present disclosure, as shown in fig. 6, a flowchart of the synthetic aperture radar detection method shown in an exemplary embodiment of the present disclosure includes the following steps:
step S61, determining a detection region;
step S62, designing a 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 a plurality of scanning images;
step S64, carrying out multi-angle image fusion on the multiple scanning images to obtain a fused image;
step S65, performing post-processing on the fusion image to obtain a processed fusion image;
and step S66, performing target recognition on the processed fusion image.
In this embodiment, the working mode of designing the synthetic aperture includes designing the number of scans of the scanning detection region, and the side view angle and the oblique view angle of each scan.
In the method, when the detection area needs to be scanned for multiple times, only the squint angle of the beam transmitted by the satellite-borne synthetic aperture radar antenna needs to be adjusted, so that new functions do not need to be developed again, almost all SAR satellites can be realized at present, new satellites do not need to be transmitted for the new functions, and the method has strong universality. In addition, the shielded target or the target with complex scattering characteristics is quite common in actual observation, so that the synthetic aperture radar detection method provided by the disclosure has strong practicability.
As shown in fig. 7, a schematic diagram of a synthetic aperture radar detection apparatus is shown for an exemplary embodiment of the present disclosure, the apparatus comprising:
a region determining module 71, configured to determine a detection region, where the detection region at least includes a region where an object to be observed is located;
a processing module 72, configured to determine a scanning frequency N of the synthetic aperture radar scanning the detection area, and determine an observation angle of each scanning in N scanning, where N is a positive integer greater than 1;
and the image acquisition module 73 is configured to scan the detection area according to the scanning times and the observation angle of each scanning when the synthetic aperture radar passes through the detection area, so as to obtain a target image.
Optionally, the observation angle includes a side view angle and an oblique view angle, and the processing module 72 includes:
the side view angle determining submodule is used for determining a side view angle of the synthetic aperture radar irradiated by the beam center of the synthetic aperture radar according to the relative position of the target to be observed and the operation track of the synthetic aperture radar, wherein the side view angles of scanning in each time in the N times of scanning are the same;
and the squint angle determining submodule is used for determining the squint angle of each scanning in the N times of scanning according to the characteristic parameters of the target to be observed.
Optionally, the squint angle determination sub-module includes:
the first determining submodule is used for determining the squint angle change range of the synthetic aperture radar according to the characteristic parameters of the target to be observed;
and the second determining submodule is used for dividing the variation range of the squint angle into N equal parts and determining the squint angle of each scanning.
Optionally, the image acquisition module 73 includes:
the first acquisition submodule is used for acquiring N scanning images corresponding to N times of scanning;
and the second acquisition sub-module is used for carrying out image fusion on the N scanning images to obtain the target image.
Optionally, the apparatus further comprises:
the image processing module is used for carrying out image processing on the target image;
and the identification module is used for carrying out target identification on the target image subjected to image processing so as to detect the target to be observed.
Optionally, the apparatus further comprises:
and the control module is used for controlling the synthetic aperture radar to perform one-time scanning imaging on the area to be scanned when the area to be scanned outside the detection area is scanned.
Based on the same concept, the present disclosure also provides a computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps in the synthetic aperture radar detection method provided by the present disclosure.
Based on the same concept, the present disclosure also provides a synthetic aperture radar detection device, the device comprising: a computer-readable storage medium provided by the present disclosure; and one or more processors for executing the program in the computer-readable storage medium.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (8)
1. A synthetic aperture radar detection method, 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;
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 determining the observation angle for each of the N scans includes:
determining a side view angle of a beam center of the synthetic aperture radar irradiating the target to be observed according to the relative position of the target to be observed and the operation track of the synthetic aperture radar, wherein the side view angles of each scanning in the N times of scanning are the same;
and determining the squint angle of each scanning in the N times of scanning according to the characteristic parameters of the target to be observed.
2. The method according to claim 1, wherein the determining the squint angle of each of the N scans according to the characteristic parameter of the target to be observed comprises:
determining the variation range of the squint angle of the synthetic aperture radar according to the characteristic parameters of the target to be observed;
dividing the variation range of the oblique angle into N equal parts, and determining the oblique angle of each scanning.
3. The synthetic aperture radar detection method of claim 1, wherein the scanning the detection area according to the scanning times and the observation angle of each scanning to obtain a target image comprises:
obtaining N scanning images corresponding to N times of scanning;
and carrying out image fusion on the N scanning images to obtain the target image.
4. The synthetic aperture radar detection method of claim 1, wherein after said obtaining a target image, the method further comprises:
performing image processing on the target image;
and carrying out target identification on the target image subjected to image processing so as to detect the target to be observed.
5. The synthetic aperture radar detection method of claim 1, further comprising:
and when scanning the area to be scanned outside the detection area, controlling the synthetic aperture radar to perform primary scanning imaging on the area to be scanned.
6. A synthetic aperture radar detection apparatus, the apparatus comprising:
the system comprises a region determining module, a region determining module and a detecting module, wherein the region determining module is used for determining a detection region, and the detection region at least comprises a region where a target to be observed is located;
the processing module is used for 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;
the image acquisition module is used for scanning the detection area according to the scanning times and the observation angle of each scanning when the synthetic aperture radar passes through the detection area to obtain a target image;
the observation angle includes a lateral view angle and an oblique view angle, and the processing module includes:
the side view angle determining submodule is used for determining a side view angle of the synthetic aperture radar irradiated by the beam center of the synthetic aperture radar according to the relative position of the target to be observed and the operation track of the synthetic aperture radar, wherein the side view angles of scanning in each time in the N times of scanning are the same;
and the squint angle determining submodule is used for determining the squint angle of each scanning in the N times of scanning according to the characteristic parameters of the target to be observed.
7. A computer-readable storage medium, on which computer program instructions are stored, which program instructions, when executed by a processor, carry out the steps of the method according to any one of claims 1 to 5.
8. A synthetic aperture radar detection apparatus, the apparatus comprising:
the computer-readable storage medium recited in claim 7; and
one or more processors to execute the program in the computer-readable storage medium.
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