Method for improving on-orbit performance of SAR satellite based on electromechanical combined scanning

A satellite and satellite parameter technology, applied in the field of SAR satellite on-orbit performance improvement based on electromechanical joint scanning, can solve problems such as increased grating lobes, reduced imaging range, image blur performance, and decreased signal-to-noise ratio

Active Publication Date: 2017-09-05
BEIJING INST OF SPACECRAFT SYST ENG
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However, the increase in the electronic scanning range leads to a decrease in the quality of the antenna pattern and an increase in grating lobes, which eventua

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  • Method for improving on-orbit performance of SAR satellite based on electromechanical combined scanning
  • Method for improving on-orbit performance of SAR satellite based on electromechanical combined scanning
  • Method for improving on-orbit performance of SAR satellite based on electromechanical combined scanning

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[0074] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the public implementation manners of the present invention in detail with reference to the accompanying drawings.

[0075] refer to figure 1 , shows a flow chart of steps of a method for improving the on-orbit performance of a SAR satellite based on electromechanical joint scanning in an embodiment of the present invention. In this embodiment, the SAR satellite on-orbit performance improvement method based on electromechanical joint scanning includes:

[0076] Step 101, determine the desired target azimuth resolution ρ a and the desired imaging scene length W a , and the maximum electrical scanning range θ that the satellite antenna can provide e and beam scan step value d θ .

[0077] In this embodiment, the expected target azimuth resolution ρ can be given according to the application requirements and satellite capabilities, combin...

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Abstract

The invention discloses a method for improving the on-orbit performance of an SAR satellite based on electromechanical combined scanning, and the method comprises the steps: setting a moment when the Doppler frequency of the echo of the center of an imaging scene is zero as an imaging center moment; setting ground aiming points of the azimuth at different moments; calculating an instantaneous echo time range according to the range of the slope distance between the satellite and a scene; selecting a proper pulse repetition rate; determining the scanning range of an antenna according to the electric scanning capability of the satellite antenna; calculating the number of residence pulses according to the electric scanning range and a beam scanning step value; calculating the electric scanning angles of the antenna at all the time points according to the constant-speed scanning law; calculating an attitude angle required by the instantaneous imaging according to the instantaneous ephemeris data, the ground aiming points and the electric scanning angles of the antenna at instantaneous moments through employing a vector method; judging whether a satellite control system can meet the above attitude demands or not; and completing the parameter design. Therefore, the method achieves the overall improvement of the image performances of an on-orbit phased-array system SAR satellite in the mode of electromechanical combined scanning.

Description

technical field [0001] The invention belongs to the technical field of satellite on-orbit performance improvement, and in particular relates to a method for improving the on-orbit performance of a SAR satellite based on electromechanical combined scanning. Background technique [0002] Most of the existing in-orbit SAR (Synthetic Aperture Radar, synthetic aperture radar) satellites adopt the phased array system, which has the characteristics of front and side view and small scanning range. ° range. This feature of SAR satellites limits the further improvement of its performance and restricts the further expansion of the application range of in-orbit SAR satellites. Therefore, it is necessary to study how to give full play to the capabilities of on-orbit phased array SAR satellites, improve the performance of the satellite system, and obtain higher-quality spaceborne SAR images. [0003] The TerraSAR-X satellite launched by Germany in 2007 conducted a performance extension ...

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Application Information

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IPC IPC(8): G01S13/90G01S7/02
Inventor 张庆君韩晓磊刘杰赵良波李延齐亚琳王建军
Owner BEIJING INST OF SPACECRAFT SYST ENG
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