CN115184936B - Target all-angle sample generation method and device based on circumferential synthetic aperture radar - Google Patents
Target all-angle sample generation method and device based on circumferential synthetic aperture radar Download PDFInfo
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- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
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- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
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- G06V10/74—Image or video pattern matching; Proximity measures in feature spaces
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Abstract
The application relates to a target all-angle sample generation method and device based on a circumferential synthetic aperture radar. The method comprises the following steps: the method comprises the steps of simultaneously carrying out imaging detection and recording on a plurality of targets to be observed based on a manned or unmanned aerial vehicle-mounted multi-baseline circumferential synthetic aperture radar to obtain echo data, dividing the echo data to obtain a plurality of sections of sub-aperture echo data, processing each section of sub-aperture echo data to obtain an accurate path of a time-mounted platform for recording the section of data, dividing each section of sub-aperture again to obtain a plurality of sections of minimum sub-aperture echo data, and carrying out imaging processing by combining a corresponding accurate track to obtain a large number of sub-images. By adopting the method, the imaging scattering characteristics of the target under the complete azimuth angle of 0-360 degrees and different pitch angles can be obtained, the flight operation is simple, the cost is low, simultaneously the target information is continuous, the reconstruction can be carried out randomly according to the requirement, the expansibility is good, the repeated recording is realized, and the data acquisition cost is greatly reduced.
Description
Technical Field
The application relates to the technical field of radar signal processing, in particular to a target all-angle sample generation method and device based on a circumferential synthetic aperture radar.
Background
At present, synthetic Aperture Radar (SAR) becomes an important reconnaissance monitoring means, and forms effective complementation with optics and infrared, thereby providing information support for battlefield reconnaissance and accurate target striking. China is already provided with SAR systems of various platforms such as satellites, manned vehicles, unmanned vehicles and the like. At present, the SAR technology is continuously applied and has increasingly prominent military and civil values. With the development of SAR technology, radar image data will show explosive growth, but the automatic SAR image interpretation work is seriously lagged, and the actual image interpretation requirement is difficult to meet.
In recent years, with the application of artificial intelligence technology in SAR image interpretation, the automatic interpretation level of SAR images is improved to a certain extent, but the practical requirements for distance are still different. There are many reasons for hindering the intelligent interpretation of SAR images, including data, algorithms and algorithms, etc., but the primary reason for this is the data. The existing SAR target actual measurement samples in China are few in number, serious in information homogenization and lack of diversity, belong to small sample data, and cannot effectively support research and processing of SAR target intelligent identification technology, so that the technical level equivalent to the optical image intelligent interpretation cannot be achieved all the time, and a great gap is left from practical use. Therefore, if the intelligent interpretation level of the SAR image is greatly improved, the data limit of the SAR target 'small sample' must be broken through, and the large sample data which can meet the intelligent identification of the SAR target is obtained, so that a better intelligent identification result of the SAR target can be obtained. And the traditional airborne SAR imaging is used for acquiring complete imaging information of a target, a complex flight path needs to be designed, the operation is extremely complex, the cost is extremely expensive, and the practical feasibility is not realized.
Disclosure of Invention
Therefore, in order to solve the above technical problems, a method and an apparatus for generating a target full-angle sample based on a circumferential synthetic aperture radar are needed to be provided, which can quickly obtain a large number of complete measured SAR target samples.
A method for generating a target all-angle sample based on a circular Synthetic Aperture Radar (SAR), the method comprising:
acquiring echo data, wherein the echo data are obtained by simultaneously carrying out imaging detection and admission on a plurality of targets to be observed based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
dividing echo data corresponding to a complete circumferential aperture baseline into a plurality of sections of sub-aperture echo data according to a preset sub-aperture accumulation angle;
processing each section of the sub-aperture echo data to obtain an accurate track of the time-carrying platform corresponding to each section of the sub-aperture echo data recording;
dividing the sub-aperture echo data into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture accumulation angle, and performing imaging processing by combining the corresponding accurate tracks to obtain sub-images corresponding to the minimum sub-aperture echo data of each section;
sequentially processing echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images, and storing the sub-images in a data fragmentation distributed manner;
and recombining the stored sub-images according to the sample requirement to obtain a sample set matched with the sample requirement.
In one embodiment, each target to be observed is located in a central region of an observation scene.
In one embodiment, the echo data corresponding to each complete circumferential aperture baseline is obtained by performing imaging detection and acquisition on a plurality of targets to be observed by the circumferential synthetic aperture radar under different pitch angles.
In one embodiment, when the echo data corresponding to one complete circumferential aperture baseline is divided into multiple segments of sub-aperture echo data according to a preset sub-aperture accumulation angle, two adjacent segments of the sub-aperture echo data are overlapped or not overlapped.
In one embodiment, the sub-aperture accumulation angle is selected according to different circumferential synthetic aperture radars, so that the azimuth direction of the sub-image is equivalent to the range direction resolution.
In one embodiment, the processing each segment of the sub-aperture echo data to obtain an accurate track of the carrier platform when each segment of the sub-aperture echo data is recorded includes: and sequentially carrying out preprocessing, coarse imaging, error estimation and track reconstruction on the sub-aperture echo data to obtain the accurate track.
In one embodiment, when the minimum sub-aperture echo data is used and the corresponding accurate trajectory is combined for imaging processing to obtain the sub-image corresponding to each segment of the minimum sub-aperture echo data, the imaging method adopts a time domain algorithm.
In one embodiment, the position and posture information of all the targets to be observed is recorded and marked in the corresponding sub-images.
A circumferential synthetic aperture radar based target full-angle sample generation apparatus, the apparatus comprising:
the echo data acquisition module is used for acquiring echo data, and the echo data is obtained by simultaneously carrying out imaging detection and admission on a plurality of targets to be observed based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
the sub-aperture echo data dividing module is used for dividing echo data corresponding to a complete circumferential aperture baseline into a plurality of sections of sub-aperture echo data according to a preset sub-aperture cumulative angle;
the accurate track obtaining module is used for processing each section of the sub-aperture echo data to obtain an accurate track of the time-carrying platform corresponding to each section of the sub-aperture echo data recording;
the sub-image imaging module is used for dividing the sub-aperture echo data into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture cumulative angle and carrying out imaging processing by combining the corresponding accurate tracks to obtain sub-images corresponding to the minimum sub-aperture echo data of each section;
the fragmentation storage module is used for processing the echo data corresponding to the complete circumferential aperture baselines in sequence to obtain a plurality of sub-images and storing the sub-images in a data fragmentation distributed manner;
and the sample set obtaining module is used for recombining the stored sub-images according to the sample requirements to obtain a sample set matched with the sample requirements.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring echo data, wherein the echo data are obtained by simultaneously carrying out imaging detection and admission on a plurality of targets to be observed based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
dividing echo data corresponding to a complete circumferential aperture base line into a plurality of sections of sub-aperture echo data according to a preset sub-aperture accumulation angle;
processing each section of the sub-aperture echo data to obtain an accurate track of the time-carrying platform corresponding to each section of the sub-aperture echo data recording;
dividing the sub-aperture echo data into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture cumulative angle, and performing imaging processing by combining the corresponding accurate tracks to obtain sub-images corresponding to the minimum sub-aperture echo data of each section;
sequentially processing echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images, and storing the sub-images in a data fragmentation distributed manner;
and recombining the stored plurality of sub-images according to the sample requirement to obtain a sample set matched with the sample requirement.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring echo data, wherein the echo data are obtained by simultaneously carrying out imaging detection and admission on a plurality of targets to be observed based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
dividing echo data corresponding to a complete circumferential aperture baseline into a plurality of sections of sub-aperture echo data according to a preset sub-aperture accumulation angle;
processing each section of the sub-aperture echo data to obtain an accurate track of the time-carrying platform corresponding to each section of the sub-aperture echo data recording;
dividing the sub-aperture echo data into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture accumulation angle, and performing imaging processing by combining the corresponding accurate tracks to obtain sub-images corresponding to the minimum sub-aperture echo data of each section;
sequentially processing echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images, and storing the sub-images in a data fragmentation distributed manner;
and recombining the stored sub-images according to the sample requirement to obtain a sample set matched with the sample requirement.
According to the target full-angle sample generation method and device based on the circumferential synthetic aperture radar, imaging detection admission is simultaneously carried out on a plurality of targets to be observed based on the manned or unmanned aerial vehicle-mounted multi-baseline circumferential synthetic aperture radar to obtain echo data, a plurality of sections of sub-aperture echo data are obtained, each section of sub-aperture echo data is processed to obtain an accurate path of a time platform for admission of the section of data, each section of sub-aperture is divided again to obtain a plurality of sections of minimum sub-aperture echo data, and imaging processing is carried out by combining the corresponding accurate path to obtain a large number of sub-images. The imaging scattering characteristics of the target under the complete azimuth angle of 0-360 degrees and different pitch angles can be obtained in one flight based on the multi-baseline circumference synthetic aperture radar, the flight operation is simple, the cost is low, simultaneously the target information is continuous, the reconstruction can be carried out randomly according to the requirement, the expansibility is good, the recording is repeated, and the data acquisition cost is greatly reduced.
Drawings
FIG. 1 is a schematic flow chart of a target all-angle sample generation method based on a circular synthetic aperture radar in one embodiment;
FIG. 2 is a schematic diagram of an embodiment of a circumferential synthetic aperture radar system;
FIG. 3 is a schematic diagram illustrating steps in one embodiment of a method for generating a target full-angle sample;
fig. 4 is a schematic diagram of an SAR imaging scene and target placement in another embodiment, which includes 6 types of civil vehicle targets, namely, a vehicle target 1, a vehicle target 2, a vehicle target 3, a vehicle target 4, a vehicle target 5, and a vehicle target 6;
FIG. 5 is a schematic diagram of a SAR vehicle target full-angle sample library in another embodiment;
FIG. 6 is a block diagram of a target all-angle sample generation apparatus based on a circular synthetic aperture radar in one embodiment;
FIG. 7 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As shown in fig. 1, a method for generating a target full-angle sample based on a circular synthetic aperture radar is provided, which includes the following steps:
s100, acquiring echo data, wherein the echo data are obtained by simultaneously carrying out imaging detection and admission on a plurality of targets to be observed based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
step S110, dividing echo data corresponding to a complete circumferential aperture baseline into a plurality of sections of sub-aperture echo data according to a preset sub-aperture cumulative angle;
step S120, each section of sub-aperture echo data is processed to obtain the accurate track of the time-carrying platform corresponding to each section of sub-aperture echo data recording;
step S130, dividing the sub-aperture echo data into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture accumulation angle, and performing imaging processing by combining corresponding accurate tracks to obtain sub-images corresponding to each section of minimum sub-aperture echo data;
step S140, sequentially processing echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images, and storing the sub-images in a data fragmentation distributed manner;
and S150, recombining the stored sub-images according to the sample requirement to obtain a sample set matched with the sample requirement.
The method is based on a complete data set construction method of a manned or unmanned airborne Circular Synthetic Aperture Radar (CSAR), adopts a CSAR imaging mode, utilizes the characteristic that the CSAR imaging mode can carry out all-directional observation on a target, can acquire imaging observation data of the target in a complete azimuth angle position of 0-360 degrees in one flight, and can also acquire imaging observation data of the target under different pitch angles by adjusting the posture of a recording platform.
In step S100, for the recording step of echo data, a plurality of targets to be observed are placed in a central area of an observation scene, imaging detection is performed on the targets at different pitch angles by using a recorded multi-baseline CSAR imaging mode, and the echo data is recorded. And recording the position and posture information of all the targets to be observed.
In step S110, a complete circumferential aperture baseline is first identified
Corresponding echo data with a predetermined sub-aperture cumulative angle
Is divided into
Segment sub-aperture echo data, and are labeled respectively
. When the echo data is divided, two adjacent sections of the sub-aperture echo data can be mutually overlapped or not overlapped according to different scene requirements.
The echo data comprises echo data corresponding to a plurality of complete circumferential aperture baselines, and each complete circumferential aperture baseline corresponds to imaging detection under different pitch angles.
At the cumulative angle of the subaperture
When the specific numerical value is selected, selecting a sub-aperture accumulated angle which enables the azimuth resolution to be equivalent to the range resolution in the subsequently obtained sub-image according to the currently used circumferential synthetic aperture radar system.
In step S120, the sub-aperture echo data is processed to obtain an accurate route of the airborne platform when recording the sub-aperture echo data, so that the sub-image is more accurately generated subsequently.
In one embodiment, when sub-aperture echo data is processed, sequentially = preprocessing, coarse imaging, error estimation and trajectory reconstruction to obtain an accurate trajectory.
In step S130, the angle of each segment of sub-aperture echo data is further accumulated according to a preset minimum sub-aperture
Dividing again into
Segment and image with corresponding precise track to obtain sub-image
That is to say that here one can obtain
*
A number of sub-images.
In one embodiment, the sub-image imaging method employs a time domain algorithm.
In this embodiment, step S120 and step S130 may be processed in parallel to improve efficiency.
In step S140, the other circumferential aperture baselines are processed
Correspond toThe echo data are processed according to the steps S110 to S130 and corresponding sub-images are obtained
，
，
，
At this time, can be obtained
*
*
The number of sub-images and storing the resulting large number of sub-images in a fragmentation distribution to reduce the spatial pressure of the data stored in a single storage.
In step S150, the stored sub-image is processed according to the user' S system requirement
Recombining to obtain target database matched with user parameter (requirement)
。
When constructing the image sample set, marking the corresponding sub-images with the recorded position and posture information of all the targets.
In the text, the effectiveness of the method is proved by experimental results through the verification of actually measured radar echo data according to the method. Fig. 2 is a schematic diagram of the operation of the test radar system. The radar adopts a CSAR working mode, flies around a detection area, and finally, the radar imaging technology is utilized to map the collected echo into an image corresponding to the ground scene distribution. Fig. 3 is a flow chart for imaging and storing the recorded data. Fig. 4 is an obtained sub-aperture SAR scene map and an optical image corresponding to a vehicle target placed in the scene, where the optical image includes 6 types of civil vehicle targets, which are a vehicle target 1, a vehicle target 2, a vehicle target 3, a vehicle target 4, a vehicle target 5, and a vehicle target 6. All-angle samples of 6 types of civil vehicle targets are collected in the experiment, and after data processing by the method, an SAR vehicle target all-angle sample library shown in figure 5 is obtained, wherein each type of vehicle target comprises 360-degree all-angle samples.
In the target full-angle sample generation method based on the circumferential synthetic aperture radar, a complete data set construction method based on a manned/unmanned airborne Circumferential Synthetic Aperture Radar (CSAR) adopts a CSAR imaging mode, utilizes the characteristic that the CSAR imaging mode can carry out all-around observation on a target, can acquire imaging observation data of the target in a 0-360-degree complete azimuth angle range through one-time flight observation, and has the advantages of simple flight operation, low cost, high efficiency and the like. Meanwhile, the target information is continuous, the target sample can be randomly reconstructed as required, the expansibility is good, repeated recording is not needed, and the data acquisition cost can be greatly reduced.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 6, there is provided a target full-angle sample generation apparatus based on a circular synthetic aperture radar, including: an echo data acquisition module 600, a sub-aperture echo data partitioning module 610, an accurate trajectory obtaining module 620, a sub-image imaging module 630, a fragmentation storage module 640, and a sample set obtaining module 650, wherein:
the echo data acquisition module 600 is configured to acquire echo data, where the echo data is obtained by performing imaging detection and admission on multiple targets to be observed simultaneously based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
the sub-aperture echo data dividing module 610 is configured to divide echo data corresponding to one complete circumferential aperture baseline into multiple segments of sub-aperture echo data according to a preset sub-aperture cumulative angle;
an accurate track obtaining module 620, configured to process each segment of the sub-aperture echo data to obtain an accurate track of the time-carrying platform when each segment of the sub-aperture echo data is recorded;
the sub-image imaging module 630 is configured to divide the sub-aperture echo data into multiple segments of minimum sub-aperture echo data according to a preset minimum sub-aperture cumulative angle, and perform imaging processing in combination with the corresponding accurate trajectory to obtain sub-images corresponding to the minimum sub-aperture echo data of each segment;
the fragmentation storage module 640 is configured to sequentially process echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images, and store the sub-images in a data fragmentation distributed manner;
a sample set obtaining module 650, configured to recombine the stored multiple sub-images according to sample requirements, so as to obtain a sample set matching the sample requirements.
For specific limitations of the target all-angle sample generation apparatus based on the circular synthetic aperture radar, reference may be made to the above limitations of the target all-angle sample generation method based on the circular synthetic aperture radar, and details are not repeated here. The modules in the target full-angle sample generation device based on the circumferential synthetic aperture radar can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing the sub-image data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to realize a target full-angle sample generation method based on the circular synthetic aperture radar.
Those skilled in the art will appreciate that the architecture shown in fig. 7 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring echo data, wherein the echo data are obtained by simultaneously carrying out imaging detection and admission on a plurality of targets to be observed based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
dividing echo data corresponding to a complete circumferential aperture baseline into a plurality of sections of sub-aperture echo data according to a preset sub-aperture accumulation angle;
processing each section of the sub-aperture echo data to obtain an accurate track of the time-carrying platform corresponding to each section of the sub-aperture echo data recording;
dividing the sub-aperture echo data into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture cumulative angle, and performing imaging processing by combining the corresponding accurate tracks to obtain sub-images corresponding to the minimum sub-aperture echo data of each section;
sequentially processing echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images, and storing the sub-images in a data fragmentation distributed manner;
and recombining the stored plurality of sub-images according to the sample requirement to obtain a sample set matched with the sample requirement.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, performs the steps of:
acquiring echo data, wherein the echo data are obtained by simultaneously carrying out imaging detection and admission on a plurality of targets to be observed based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
dividing echo data corresponding to a complete circumferential aperture base line into a plurality of sections of sub-aperture echo data according to a preset sub-aperture accumulation angle;
processing each section of the sub-aperture echo data to obtain an accurate track of a time-carrying platform corresponding to each section of the sub-aperture echo data recording;
dividing the sub-aperture echo data into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture cumulative angle, and performing imaging processing by combining the corresponding accurate tracks to obtain sub-images corresponding to the minimum sub-aperture echo data of each section;
sequentially processing echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images, and storing the sub-images in a data fragmentation distributed manner;
and recombining the stored sub-images according to the sample requirement to obtain a sample set matched with the sample requirement.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (7)
1. The target all-angle sample generation method based on the circular synthetic aperture radar is characterized by comprising the following steps of:
acquiring echo data, wherein the echo data are obtained by simultaneously carrying out imaging detection and admission on a plurality of targets to be observed under different pitch angles on the basis of a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
dividing echo data corresponding to a complete circumferential aperture baseline into a plurality of sections of sub-aperture echo data according to a preset sub-aperture accumulation angle, wherein two adjacent sections of the sub-aperture echo data are overlapped with each other;
processing each section of the sub-aperture echo data to obtain an accurate track of the time-carrying platform corresponding to each section of the sub-aperture echo data recording;
when each section of sub-aperture echo data is processed, the sub-aperture echo data is divided into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture accumulation angle, and imaging processing is carried out by combining the corresponding accurate track to obtain a sub-image corresponding to each section of the minimum sub-aperture echo data;
sequentially processing echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images, and storing the sub-images in a data fragmentation distributed manner;
and recombining the stored plurality of sub-images according to the sample requirement to obtain a sample set matched with the sample requirement.
2. The method for generating the target all-angle sample according to claim 1, wherein each target to be observed is located in a central region of an observation scene.
3. The method of claim 1, wherein the sub-aperture cumulative angles are selected such that the azimuth and range resolutions of the sub-images are equal to each other according to different circular synthetic aperture radars.
4. The method of claim 1, wherein the processing each segment of the sub-aperture echo data to obtain an accurate trajectory of a loading platform corresponding to each segment of the sub-aperture echo data during recording comprises: and sequentially carrying out preprocessing, coarse imaging, error estimation and track reconstruction on the sub-aperture echo data to obtain the accurate track.
5. The method for generating the target all-angle sample according to claim 1, wherein a time domain algorithm is used in the imaging method when the sub-images corresponding to the minimum sub-aperture echo data are obtained by using the minimum sub-aperture echo data and performing the imaging processing in combination with the corresponding accurate trajectory.
6. The method for generating the target all-angle sample according to claim 1, wherein the position and posture information of all the targets to be observed is recorded and marked in the corresponding sub-images.
7. A target all-angle sample generation apparatus based on a circular synthetic aperture radar, the apparatus comprising:
the echo data acquisition module is used for acquiring echo data, and the echo data is obtained by simultaneously performing imaging detection and acquisition on a plurality of targets to be observed under different pitch angles based on a multi-baseline circumferential synthetic aperture radar carried by a person or an unmanned aerial vehicle;
the sub-aperture echo data dividing module is used for dividing echo data corresponding to a complete circumferential aperture baseline into a plurality of sections of sub-aperture echo data according to a preset sub-aperture accumulation angle, and two adjacent sections of the sub-aperture echo data are mutually overlapped;
the precise track obtaining module is used for processing each section of the sub-aperture echo data to obtain a precise track of the time-carrying platform corresponding to each section of the sub-aperture echo data recording;
the sub-image imaging module is used for dividing the sub-aperture echo data into a plurality of sections of minimum sub-aperture echo data according to a preset minimum sub-aperture accumulation angle while processing each section of the sub-aperture echo data, and performing imaging processing by combining the corresponding accurate track to obtain a sub-image corresponding to each section of the minimum sub-aperture echo data;
the fragmentation storage module is used for sequentially processing echo data corresponding to a plurality of complete circumferential aperture baselines to obtain a plurality of sub-images and storing the sub-images in a data fragmentation distributed manner;
and the sample set obtaining module is used for recombining the stored sub-images according to the sample requirements to obtain a sample set matched with the sample requirements.
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