Method for 3D Baseline Calibration of Spaceborne Distributed Interferometric Synthetic Aperture Radar
An interferometric synthetic aperture and distributed technology, applied in radio wave measurement systems, instruments, etc., can solve the problem of poor radial 3D baseline calibration accuracy, and achieve the effect of improving the state of the normal equation coefficient matrix and improving the accuracy.
Active Publication Date: 2020-08-04
中国人民解放军61540部队
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[0006] Based on this, in order to solve the problem of poor calibration accuracy of the above-mentioned three-dimensional baselines in along-track, cross-track and radial directions, a method for three-dimensional baseline calibration of spaceborne distributed interferometric synthetic aperture radar that can meet the design specifications is provided
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[0057] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation of the method for three-dimensional baseline calibration of spaceborne distributed interferometric synthetic aperture radar of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0058] Such as figure 1 As shown, the method for the three-dimensional baseline calibration of the spaceborne distributed interferometric synthetic aperture radar of one of the embodiments comprises the following steps:
[0059] S100. Obtain image coordinates of ground control points and baseline calibration parameters corresponding to the ground control points according to the calibration field echo data.
[0060] In addition, the baseline calibration parameters include the in...
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The invention relates to a method for calibrating the three-dimensional baseline of a space-borne distributed interferometric synthetic aperture radar. The method includes the following steps: obtaining the image coordinates and baseline calibration parameters of the ground control point according to the echo data of the calibration field; bringing the baseline calibration parameters into the baseline calibration model to obtain the error equation of the control point; according to the error equation, Calculate the baseline correction numbers of the three axes; when one or more absolute values of the baseline correction numbers of the three axes are greater than or equal to the preset threshold, the initial value of the baseline vector and the current baseline correction number are summed as a new value. The baseline vector is brought into the baseline calibration model for recalculation; when the absolute values of the baseline corrections of the three axes are all less than the preset threshold, the sum of the obtained baseline corrections for each axis is calculated as the final three axes. The number of baseline corrections to the direction; the final baseline vector is determined according to the final baseline correction number. Wherein, the baseline calibration model consists of an auxiliary radar range modification equation and an auxiliary radar Doppler equation.
Description
technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a three-dimensional baseline calibration method for spaceborne distributed interferometric synthetic aperture radar. Background technique [0002] The space-borne distributed interferometric synthetic aperture radar (Interferometric Synthetic Aperture Radar, InSAR) system refers to the use of multiple Synthetic Aperture Radar (SAR) satellites that meet a certain formation InSAR measurement system that receives, multi-transmits and multi-receives or alternately transmits respective receiving interferometric imaging to obtain SAR complex image pairs. Compared with repetitive orbit InSAR, space-borne distributed InSAR has better coherence between echoes, high data availability and high product accuracy; Shape switching can support multi-task and multi-mode, variable baseline length, easy to achieve optimal baseline, and high product accuracy. [0003] The interfero...
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IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 钱方明陈刚楼良盛刘薇张笑微张昊刘志铭牛瑞
Owner 中国人民解放军61540部队