A Design Method for On-orbit Implementation of Spaceborne SAR Mosaic Pattern

A design method, mosaic technology, applied in computing, reflection/re-radiation of radio waves, instruments, etc., to achieve the effect of improving processing efficiency

Active Publication Date: 2022-05-24
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0003] At present, the research on the mosaic mode is still limited to the theoretical analysis and simulation calculation of technical indicators such as resolution and imaging width. or system parameters to design the specific work implementation of the spaceborne SAR mosaic mode, and the core content in the specific work implementation of the mosaic mode is to determine the attitude maneuver method of the satellite platform and the switching time of the range beam during the imaging process

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  • A Design Method for On-orbit Implementation of Spaceborne SAR Mosaic Pattern
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  • A Design Method for On-orbit Implementation of Spaceborne SAR Mosaic Pattern

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Embodiment Construction

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

[0075] like figure 1 As shown, the concrete steps of the present invention are as follows:

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

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

[0078] 1) In each sub-swath in the distance direction, two adjacent sub-images must have a certain overlap in the azimuth direction to ensure effective splici...

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Abstract

A design method for on-orbit implementation of a spaceborne SAR mosaic pattern. The present invention firstly establishes the design constraints of the mosaic pattern according to the geometric resolution to be achieved by the spaceborne SAR image, the scene width, and the required number of elevation beams. ;Secondly, the attitude maneuvering mode of the satellite platform in the mosaic mode imaging process is designed according to the constraint conditions; Thirdly, according to the resolution requirements, the oblique angle of the antenna beam at the initial moment, and the maneuver curve of the satellite attitude over time, the antenna beam is calculated at the pitch to each moment of switching. Finally, according to the designed attitude maneuvering curve and beam switching time, it is confirmed that: 1) the resolution in azimuth direction has reached the technical index; integrity.

Description

technical field [0001] The invention relates to an on-orbit implementation design method of a spaceborne SAR mosaic mode, belonging to the technical field of space microwave remote sensing. Background technique [0002] In order to improve the azimuth resolution and range mapping width of the spaceborne SAR image, the mosaic mode of the reflector spaceborne SAR uses the satellite platform to maneuver to increase the azimuth synthetic aperture time and the elevation beam scan to increase 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 meet the technical requirements; Images can be seamlessly stitched in the azimuth direction, ensuring the integrity of the entire scene image. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G06T3/40
CPCG01S13/9094G06T3/4038
Inventor 冯帆贺荣荣高阳杨娟娟孙嘉郭磊党红杏
Owner XIAN INSTITUE OF SPACE RADIO TECH
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