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

A technology of differential interference and interference phase, which is used in radio wave measurement systems, instruments, etc., to eliminate influences and improve calibration accuracy.

Active Publication Date: 2018-11-23
BEIJING INST OF REMOTE SENSING EQUIP
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  • Application Information

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

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Embodiment Construction

[0032] A baseline calibration method for along-track interferometric SAR based on differential interferometric phase, the specific steps of which are as follows:

[0033] The first step is to build the along-track interferometric SAR baseline calibration system

[0034] The along-track interferometric SAR baseline calibration system includes: SAR image interferometry module, interferometric phase estimation module, sensitivity equation module, and accuracy judgment module.

[0035] The SAR image interference module is used to perform differential operations on the SAR image interferometric phase values ​​corresponding to adjacent scalers;

[0036] The interferometric phase estimation module is used to obtain an estimated interferometric phase value corresponding to each scaler, and perform a differential operation on the estimated interferometric phase values ​​corresponding to adjacent scalers;

[0037] The sensitivity equation module is used to obtain the sensitivity equati...

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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...

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 李纪传张慧
Owner BEIJING INST OF REMOTE SENSING EQUIP
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