Differential interference phase-based along track interferometric SAR baseline calibration method

Abstract

The invention discloses a differential interference phase-based along track interferometric SAR baseline calibration method. The method includes the following specific steps that: an along track interferometric SAR baseline calibration system including an SAR image interference module, an interference phase estimation module, a sensitivity equation module and a precision judgment module is constructed; a range direction corresponding to a certain orientation moment is selected according to a predetermined flight path, and N static corner reflectors are arranged evenly as much as possible in acalibration field, wherein N is larger than or equal to 3; the SAR image interference module acquires the differential interference phases of the calibration points; the interference phase estimationmodule estimates differential interference phases between adjacent calibration points; the sensitivity equation module calibrates baseline component error; and the accuracy judgment module judges whether accuracy meets a requirement. With the method of the invention adopted, the influence of interference phase offset error on baseline calibration accuracy is eliminated, and the calibration accuracy of the baseline component of the system can be improved.

Description

technical field [0001] The invention relates to an interferometric SAR baseline calibration method, in particular to a differential interferometric phase-based along-track interferometric SAR baseline calibration method. Background technique [0002] Interferometric calibration is one of the key technologies for interferometric SAR to obtain high-precision processing results, and the baseline is the most important parameter to be calibrated in interferometric SAR calibration. The current research methods on the baseline calibration of along-track interferometric SAR do not consider the influence of interferometric phase offset error on the calibration accuracy of the baseline components. Interferometry data" proposed the method of firstly calibrating the interferometric baseline component and then calibrating the interferometric phase offset error, and the method proposed in the 2012 master's degree thesis of the Institute of Electronics "Research on Airborne ATI-SAR Baselin...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a baseline calibration method for on-track interferometric SAR based on differential interferometric phase, to solve the coupling problem between interferometric phase offset error and baseline component error in the airborne along-track SAR system

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