CN114966677B - A detection method for multifunctional spaceborne wide-area imaging search radar - Google Patents
A detection method for multifunctional spaceborne wide-area imaging search radar Download PDFInfo
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- CN114966677B CN114966677B CN202210341493.XA CN202210341493A CN114966677B CN 114966677 B CN114966677 B CN 114966677B CN 202210341493 A CN202210341493 A CN 202210341493A CN 114966677 B CN114966677 B CN 114966677B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 60
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000012790 confirmation Methods 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- 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
- G01S13/904—SAR modes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- 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
- G01S13/904—SAR modes
- G01S13/9052—Spotlight mode
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Abstract
The invention relates to a multifunctional spaceborne wide area imaging search radar detection method which comprises the following steps of 1) searching detection task planning, carrying out task planning on a search detection area according to relevant parameters of a spaceborne radar system, calculating to obtain a wide area quick search working mode, 2) carrying out the wide area quick search working mode on the area along a track, obtaining an imaging result of the area through on-orbit real-time imaging processing, further detecting, screening and positioning an interested target, 3) calculating and selecting reasonable high-splitting beam-gathering working modes comprising distance, azimuth resolution and distance azimuth breadth, 4) carrying out target identification confirmation task workflow, carrying out high-resolution imaging on the interested target in the area one by one, 5) outputting the interested target identification confirmation result, and 6) circularly executing the steps 1-5) to observe the next track area.
Description
Technical Field
The invention mainly relates to the field of sea detection imaging of a satellite-borne radar, in particular to a novel multifunctional satellite-borne wide-area imaging search radar detection method.
Background
The current observation working mode of the spaceborne radar is single, namely, the spaceborne radar can only work in a certain fixed mode when the spaceborne radar passes through a designated area each time. For example, a circular scanning radar (a satellite-borne fan-beam scanning microwave scatterometer system is used for researching forest civilization; an airborne circular SAR sea surface characteristic and ship target detection algorithm is researched to Pan Xueli) based on a microwave scatterometer working system can only realize continuous search detection of a wide area sea surface area, the resolution of an image is in the order of hundreds of meters, the provided product information can only be some 'punctiform targets', the resolution of the radar is limited, the radar can not further provide the image information of high resolution of the detected targets, and the detection can be realized through the cooperation of other satellite-borne radar satellites observed on the ground.
In addition, currently, the on-orbit satellite-borne Synthetic Aperture Radar (SAR) satellite is generally fixed in the imaging modes such as stripe, TOPS, beam focusing, etc. in the working mode of each turn-on. As shown in FIG. 1, the TOPS mode can realize continuous wide-range imaging under low resolution, and the working mode is shown as a schematic diagram, wherein a working mode of cooperative work of multiple modes does not exist in the current on-orbit satellite-borne SAR system, so that the observation efficiency of the satellite-borne radar is affected to a certain extent.
The existing working mode of the satellite-borne radar does not exist, so that the cooperative work of wide area search and high beam splitting and focusing imaging on a single satellite can be realized, and meanwhile, the continuous satellite-borne radar in the ground coverage area can work.
Disclosure of Invention
Aiming at the technical problem, the invention provides a multifunctional satellite-borne wide-area imaging search radar detection method, which can enable a satellite-borne radar satellite to simultaneously realize wide-area search imaging and target bunching high-resolution imaging in a single starting operation process through reasonable setting of working mode parameters of a radar satellite system, and simultaneously realize sea surface observation in a large area along the continuity of an observation area in a track direction, thereby greatly improving the earth observation efficiency of a satellite-borne SAR satellite.
The technical scheme of the invention is that the multifunctional spaceborne wide area imaging search radar detection method comprises the following steps:
1) The searching detection task planning is carried out according to the relevant parameters of the satellite-borne radar system aiming at the area for searching detection, and the working mode of wide area quick searching is obtained through calculation;
2) Aiming at the area along the track, carrying out wide-area quick search working modes, and obtaining an imaging result of the area through on-orbit real-time imaging processing, so as to detect, screen and locate an interested target;
3) Calculating and selecting a high beam splitting and focusing working mode, including distance, azimuth resolution and distance azimuth breadth, of parameters of an interested target output by a wide area rapid searching mode working;
4) Developing a target identification confirmation task workflow, and imaging the targets of interest in the region one by one in high resolution;
5) Outputting an interesting target identification confirmation result;
6) And (3) circularly executing the steps 1) to 5), and carrying out the next observation along the track area to realize the multifunctional integrated work of wide area quick search and imaging identification confirmation.
The beneficial effects are that:
Different from the traditional space-borne radar wide-area imaging mode, the mode of the invention is an imaging mode adopting SAR distance-oriented high resolution and azimuth-oriented low resolution, the imaging time can be effectively reduced by reducing the azimuth resolution, the distance-oriented wide-range search imaging is realized in the designated time, meanwhile, the distance-oriented high resolution keeps the distance-oriented image information in the scene target, the detection probability and the classification probability of the target in the image can be improved, the target of interest can be screened and positioned in the search imaging result through space real-time imaging processing and target positioning, and the SAR load system can be switched to the current high-resolution beam-splitting imaging mode by self-leading, so that the target of interest can be imaged in high resolution.
The integrated application of target search discovery classification and target imaging identification and confirmation can be realized, and the discovery, namely the identification, of targets is realized.
Drawings
FIG. 1 is a schematic diagram of a spaceborne TOPS mode of operation;
FIG. 2 is a schematic diagram of the operation of the multi-functional wide area search radar detection method;
FIG. 3 is a flow chart of a method of multi-functional wide area search radar detection;
FIG. 4 is a schematic diagram of the detailed timing design of region 1.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without the inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
According to an embodiment of the present invention, a method for detecting a multi-functional on-board wide area imaging search radar is provided, wherein a schematic diagram of an operation mode of the radar is shown in fig. 2, and three schematic areas are provided for convenience of analysis. The satellite flies along the track direction, and a wide-area rapid imaging mode and a target high-resolution beam-focusing mode are alternately developed through reasonable optimization configuration of azimuth time. Taking the area 1 as an example, the fast wide area imaging is to perform fast imaging on the whole area 1, the imaging process is to perform fast imaging on a plurality of sub-band areas one by one (the area 1 is divided into a plurality of distance ion bands along the distance direction), and the target high-resolution beam-focusing imaging is performed according to the result of the fast search imaging on the wide area, such as point target indication in the area 1. After the area 1 completes wide area fast imaging and target high-resolution beam focusing, the satellite sequentially carries out the same workflow on the area 2 and the area 3 along azimuth time. A detailed workflow diagram for each region is shown in fig. 3.
As shown in fig. 3, a multi-functional on-board wide area imaging search radar detection method includes the following steps:
1) The search detection task planning comprises the steps of aiming at a search detection area according to relevant parameters (orbit height H, antenna azimuth length L a, antenna distance azimuth height L r and azimuth scanning capability theta scan) of a satellite-borne radar system, and calculating to obtain a wide-area quick search working mode (mainly distance rho r, azimuth resolution rho a and distance azimuth breadth), wherein in the traditional design case, the satellite-borne SAR is generally designed to realize azimuth continuous observation, the azimuth resolution is generally as follows K a >1 is the system broadening coefficient, N is the number of distance-wise subbands, the distance-wise width W r of each subband is determined by the SAR system practical performance, the azimuth-wise width W a is determined by the azimuth scanning capability, but under this design method, the imaging time of region 1 is about W a/Vst, where V st is the satellite velocity, after imaging is completed, the satellite just runs to region 2, and the system has no additional time to develop the high-resolution beaming mode of operation.
The system design of the invention can design the azimuth resolution asIs a natural number, in which case the imaging time of region 1 is aboutAfter wide area rapid imaging is completed, a certain time remains for developing a working mode of high-resolution beamforming, so that the wide area rapid imaging and the target high-resolution beamforming imaging mode can be simultaneously realized in the observation process of each area, and satellites can be continuous along the track direction.
2) And carrying out wide-area quick search working modes, obtaining imaging results of the area through on-orbit real-time imaging processing, and further detecting, screening and positioning an interested target.
3) For the parameters of the interested target output by the wide area quick search mode work, the reasonable high-splitting beam-gathering work mode is calculated and selected, namely the distance, azimuth resolution and distance azimuth breadth, and the working time of the system capable of carrying out the high-splitting beam-gathering recognition of the target can be obtained by the step 1The distance azimuth resolution can be selected according to the target number which needs high-score identification, and the selected interval is 2-5 m. The range azimuth breadth of the beaming mode is determined by the azimuth and range antenna length of the system.
4) And developing a target identification confirmation task workflow, and imaging the targets of interest in the region one by one in high resolution.
5) And outputting the target identification confirmation result of interest.
6) And (3) circularly executing the steps 1) to 5), and carrying out the next observation along the track area, so that the wide-area rapid searching and imaging identification and confirmation multifunctional integrated work can be realized.
An embodiment of the method implemented based on an actual on-board radar system is given below:
The track height is 500km;
antenna size 4.8m (azimuth direction) ×1.2m (distance direction);
the antenna scanning capability is that the distance direction is +/-25 degrees, and the azimuth direction is +/-15 degrees;
The system wave band is a Ku wave band;
According to the existing design method of the satellite-borne radar mode, in order to realize continuous imaging in the track direction, the main working modes which can be realized by the system are as follows:
3m/30km of strip
TOPS 80m (azimuth) ×80m (distance)/60 km (azimuth) ×700km (distance)
Both modes of operation can be imaged continuously along the track direction, but there is no extra time to complete high resolution target recognition validation.
By adopting the method, the imaging accumulation time can be effectively reduced by reducing the azimuth resolution, the distance resolution is improved, and the detection probability of the target is improved. The following working modes are designed:
Wide area search detection 2m (distance). Times.100 m (azimuth)/60 km (azimuth). Times.700 km (distance), corresponding to one area (area 1) in the graph
High beam-splitting and beam-gathering mode 5m×5m/5km×5km
Thus, the continuous working imaging in azimuth direction can be realized, and further, the multifunctional integrated work of wide area rapid searching, imaging identification and confirmation can be realized by utilizing the workflow shown in fig. 2. Fig. 4 shows the detailed time allocation for zone 1.
While the foregoing has been described in relation to illustrative embodiments thereof, so as to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as limited to the spirit and scope of the invention as defined and defined by the appended claims, as long as various changes are apparent to those skilled in the art, all within the scope of which the invention is defined by the appended claims.
Claims (1)
1. The multifunctional spaceborne wide-area imaging search radar detection method is characterized by comprising the following steps of:
1) The searching detection task planning is carried out according to the relevant parameters of the satellite-borne radar system aiming at the area for searching detection, and the working mode of wide area quick searching is obtained through calculation;
2) Aiming at the area along the track, carrying out wide-area quick search working modes, and obtaining an imaging result of the area through on-orbit real-time imaging processing, so as to detect, screen and locate an interested target;
3) Calculating and selecting a high beam splitting and focusing working mode, including distance, azimuth resolution and distance azimuth breadth, of parameters of an interested target output by a wide area rapid searching mode working;
4) Developing a target identification confirmation task workflow, and imaging interested targets in the region one by one in high resolution;
5) Outputting an interesting target identification confirmation result;
6) Circularly executing the steps 1) -5), and carrying out the next observation along the track area to realize the multi-functional integrated work of wide area quick search and imaging identification confirmation;
Relevant parameters of the satellite-borne radar system comprise orbit height H, antenna azimuth length L a, antenna distance azimuth height L r and antenna azimuth maximum scanning angle theta scan;
parameters of the wide area rapid searching and high beam splitting and focusing working modes comprise a distance rho r, an azimuth resolution rho a and a distance azimuth breadth;
in the step 1), the azimuth resolution is designed as The greater N is greater than 1, the lower the resolution of the azimuth of the system, k a is the broadening coefficient of the resolution of the azimuth of the system, N is the number of distance-wise subbands, the distance-wise width W r of each subband is determined by the actual performance of the SAR system, the azimuth-wise width W a is determined by the maximum scanning angle of the azimuth scanning of the antenna of the SAR system, and in this case, the imaging time of the region isV st is satellite speed, after wide area rapid imaging is completed, a working mode of high-resolution beam focusing is developed in the rest time, a wide area rapid imaging mode and a target high-resolution beam focusing imaging mode are simultaneously realized in each regional observation process, and satellites are continuous along the track direction;
In the step 3), the working time for developing the target high-resolution beam-focusing identification by the system obtained in the step1 is The V st is the satellite speed, the distance azimuth resolution is selected according to the target number which needs to be identified in a high-resolution mode, the selected interval is 2 m-5 m, and the distance azimuth breadth of the beam focusing mode is determined by the azimuth direction and the distance direction antenna length of the system.
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| CN109977760A (en) * | 2019-01-30 | 2019-07-05 | 上海卫星工程研究所 | The intelligent spaceborne task management method of object-oriented Synthetic Aperture Radar satellite |
| CN111458711A (en) * | 2020-04-24 | 2020-07-28 | 北京卫星信息工程研究所 | Satellite-borne dual-band SAR system and detection method of ship target |
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| CN114265063A (en) * | 2021-12-07 | 2022-04-01 | 中国空间技术研究院 | A SAR satellite imaging method based on satellite-electrical joint scanning |
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| CN109977760A (en) * | 2019-01-30 | 2019-07-05 | 上海卫星工程研究所 | The intelligent spaceborne task management method of object-oriented Synthetic Aperture Radar satellite |
| CN111458711A (en) * | 2020-04-24 | 2020-07-28 | 北京卫星信息工程研究所 | Satellite-borne dual-band SAR system and detection method of ship target |
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