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Onboard P-waveband polarization synthetic aperture radar (SAR) calibration method under non-ideal calibrator condition

A scaler and non-ideal technology, applied in the direction of instruments, radio wave measurement systems, etc., can solve problems such as changes with the viewing angle of the antenna

Active Publication Date: 2013-05-08
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] It is proposed to modify the ideal calibrator scattering matrix in combination with the position and attitude of the calibrator, the size structure and the position and attitude of the carrier aircraft, as the known calibrator scattering matrix in the calibration model; the present invention proposes that before the polarization calibration process, first Correct the antenna pattern to solve the problem that the polarization calibration parameters change with the antenna viewing angle; the present invention proposes to consider the polarization angle change caused by the attitude of the carrier aircraft, and correct the polarization calibration model. After the polarization calibration model is corrected, Then perform calibration processing to extract the transmit distortion matrix and receive distortion matrix to complete the polarization correction

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  • Onboard P-waveband polarization synthetic aperture radar (SAR) calibration method under non-ideal calibrator condition
  • Onboard P-waveband polarization synthetic aperture radar (SAR) calibration method under non-ideal calibrator condition
  • Onboard P-waveband polarization synthetic aperture radar (SAR) calibration method under non-ideal calibrator condition

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[0045] The method of the present invention will be described in detail below with reference to the drawings. It should be noted that the described embodiments are for illustrative purposes only, and are not intended to limit the present invention.

[0046] In order to complete the polarization SAR calibration, it is necessary to deploy a standard calibrator with known scattering characteristics to obtain calibration data. The calibration method of the airborne P-band polarization SAR calibration method under non-ideal calibrator conditions of the present invention The schematic diagram of the external field layout is as figure 1 As shown, according to the antenna viewing angle and polarization calibration index requirements, a row of trihedral angle calibrators can be arranged along the distance direction. Here, a total of 10 trihedral angle calibrators are arranged every 3° interval for antenna pattern correction; Place a 0° and 45° dihedral calibrator with a distance of 50m on...

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Abstract

The invention provides an onboard P-waveband polarization synthetic aperture radar (SAR) calibration method under a non-ideal calibrator condition, and relates to radar techniques. The method is used for calibrating polarization discrimination, polarization channel imbalance and other system errors of the SAR. The non-ideal condition indicates non-ideal performance of scattering matrixes led in by posture changes of a calibrator and an aerial carrier. The method corrects the scattering matrixes of the ideal calibrator, carries out correction on antenna direction pictures, accordingly overcomes the occasion that calibration parameters change with visual angles (distance direction) of an antenna, takes consideration of the fact that polarizing angle changes caused by the postures of the aerial carrier change the scattering matrixes of the calibrator, corrects a polarizing calibration model based on the preceding steps, carries out calibration treatment to obtain an emission distortion matrix and a receiving distortion matrix of a system, and accordingly carries out polarizing correction for the polarization SAR pictures.

Description

Technical field [0001] The invention relates to the technical field of radar information acquisition and processing, and is an airborne P-band polarization SAR calibration method under non-ideal calibrator conditions. Background technique [0002] Polarized Synthetic Aperture Radar (SAR) is a multi-parameter, multi-channel microwave imaging radar system. Compared with traditional SAR, its measurement data contains richer target information. It is used in oceanography, glaciology, agriculture and forestry, topographic mapping and military targets. The detective has a wide range of uses. Since the polarization SAR system error will cause the polarization SAR data distortion, the polarization SAR must be polarization calibrated. System error mainly refers to the imbalance (including amplitude and phase) between the transceiver channels of different polarizations in the system, and the crosstalk between the channels is the polarization isolation parameter. [0003] The calibration of...

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S13/9076
Inventor 王宇李焱磊周良将梁兴东
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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