On-orbit implementation design method for satellite-borne SAR mosaic mode

A design method, mosaic technology, applied in computing, radio wave reflection/re-radiation, image data processing, etc.

A design method, mosaic technology, applied in computing, radio wave reflection/re-radiation, image data processing, etc.

CN112014840AActive Publication Date: 2020-12-01XIAN INSTITUE OF SPACE RADIO TECH
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  • On-orbit implementation design method for satellite-borne SAR mosaic mode
  • On-orbit implementation design method for satellite-borne SAR mosaic mode
  • On-orbit implementation design method for satellite-borne SAR mosaic mode

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Embodiment Construction

[0074] The present invention provides a complete design method and flow for platform attitude maneuvering and antenna beam scanning in the spaceborne SAR mosaic mode, ensuring that the resolution of each sub-block image, the overlap rate between images, and the size of the entire scene are all satisfied. skills requirement.

[0075] Such as figure 1 Shown, concrete steps of the present invention are as follows:

[0076] Step 1: Determine the design constraints of the spaceborne SAR mosaic pattern to obtain a complete SAR image that meets the resolution specification;

[0077] The mosaic mode is an imaging mode that combines pitch scanning and azimuth sliding beamforming. In order to ensure that this mode can obtain a complete SAR image that meets the resolution specification, there are the following two constraints:

[0078] 1) In each sub-swath in the distance direction, there must be a certain overlap between two adjacent sub-images in the azimuth direction to ensure effec...

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Abstract

The invention relates to an on-orbit implementation design method for a satellite-borne SAR mosaic mode. According to the method, a design constraint condition of a mosaic mode is built according to geometric resolution and scene breadth to be achieved by the satellite-borne SAR image and the number of needed pitching beams; an attitude maneuver mode of a satellite platform is designed in a mosaicmode imaging process according to constraint conditions; according to a resolution requirement, the squint angle of an antenna beam at a starting moment and the maneuvering curve of the satellite attitude along with time, each moment when the antenna beam is switched in the pitching direction is solved; and finally, according to the designed attitude maneuvering curve and the beam switching moment, analysis is performed to confirm the conditions that: 1) the azimuth resolution reaches a technical index, and 2) adjacent sub-block images in the mosaic can be effectively spliced in the azimuth direction to ensure the integrity of a whole scene image.

Description

technical field [0001] The invention relates to an on-orbit implementation design method of a spaceborne SAR mosaic pattern, and belongs to the technical field of space microwave remote sensing. Background technique [0002] In order to improve the azimuth resolution and range mapping width of spaceborne SAR images, the mosaic mode of spaceborne SAR on the reflector uses the satellite platform to maneuver to increase the synthetic aperture time in azimuth, and the beam scanning in elevation increases the range coverage area to achieve this. First, the purpose. The key to realizing this mode lies in the attitude maneuvering of the satellite platform and the design of the SAR antenna beam scanning method to ensure the following two goals: 1) the resolution of each sub-block image of the mosaic meets the technical requirements; 2) all sub-blocks Images can be stitched seamlessly in azimuth to ensure the integrity of the entire scene image. [0003] At present, the research on...

Claims

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Application Information

Patent Timeline
01 Dec 2020
Publication
CN112014840A
IPC
G01S13/90; G06T3/40
CPC
G01S13/9094; G06T3/4038
Inventors
冯帆; 贺荣荣