Satellite platform attitude maneuvering method for satellite-borne SAR multi-azimuth angle repeat observation

A satellite platform and attitude maneuvering technology, which is applied in the field of satellite platform attitude maneuvering

Active Publication Date: 2019-12-20
XIAN INSTITUE OF SPACE RADIO TECH
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  • Satellite platform attitude maneuvering method for satellite-borne SAR multi-azimuth angle repeat observation
  • Satellite platform attitude maneuvering method for satellite-borne SAR multi-azimuth angle repeat observation
  • Satellite platform attitude maneuvering method for satellite-borne SAR multi-azimuth angle repeat observation

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Embodiment Construction

[0056] The present invention will be further elaborated below in conjunction with embodiment.

[0057] The new multi-azimuth observation mode requires the satellite platform to maneuver within a large range of azimuth rotation angles to achieve multiple sliding spotlight mode imaging of military areas. Between two adjacent imagings, it is necessary to quickly maneuver the satellite platform, adjust the antenna beam pointing to the starting position of the scene again, and then start the next sliding spotlight imaging process.

[0058] attached figure 1 The working principle of multi-azimuth observation mode is given. In the stage 1 noted in the figure, the spaceborne SAR starts to perform sliding spotlight imaging of the scene in azimuth and super large oblique angle; start position and start Phase 2 of sliding beamforming imaging. And so on, until the entire star completes all n times of sliding spotlight imaging, so as to realize the multi-azimuth repeated observation of ...

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Abstract

The invention relates to a satellite platform attitude maneuvering method for satellite-borne SAR multi-azimuth angle repeat observation. The method comprises the following steps: s1 determining firstly imaged satellite platform attitude maneuvering way, namely, determining the location of a satellite platform at the starting imaging moment, a satellite attitude and a virtual rotation center in the first imaging process; s2, performing sliding beaming imaging, determining the satellite location at the next imaging starting moment; s3, determining the satellite attitude in the maneuvering process between twice adjacent imaging and the virtual rotation center in the next imaging process by combining the distance between the beam center and the scene after maneuvering according to the satellite location at the starting moment of the next imaging, and adjusting the beam pointing to a direction starting location of the scene in the attitude maneuvering adjusting process; and s4, repeating step s2 and s3 until the imaging work is accomplished. In each sliding beaming imaging process, the satellite platform beam center always points to the virtual rotation center determined in each imaging process.

Description

technical field [0001] The invention belongs to the technical field of space microwave remote sensing, and in particular relates to a satellite platform attitude maneuvering method. Background technique [0002] In order to improve the reconnaissance effectiveness of spaceborne SAR, it is necessary to have the ability to repeatedly observe military sensitive areas in multiple azimuths during a single transit. If it is realized by using the phased array antenna system, it realizes beam scanning and repeated observation by controlling the phase-shift code of the receiving and transmitting channels. The advantage of this method is that the satellite platform does not need to maneuver, but the disadvantage is that the antenna beam gain will increase with the rotation angle. big and low. This will lead to the loss of echo signal-to-noise ratio and the sharp deterioration of SAR image quality. If the reflector antenna is used to realize it, it needs to be realized by maneuvering...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/02H01Q3/02H01Q1/28
CPCG01S7/02G01S13/90H01Q1/288H01Q3/02
Inventor 冯帆贺荣荣雷少敏孙嘉金阿鑫侯若涵杨娟娟党红杏
Owner XIAN INSTITUE OF SPACE RADIO TECH
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