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Method for calibrating compact polarimetric SAR (Synthetic Aperture Radar) in long wave-length spaceborne pi/4 mode

A technology of reduced polarization and long wavelength, applied in the field of signal processing, can solve the problem that SAR images cannot correctly reflect the polarization scattering characteristics of surface targets, and achieve the effect of simple processing flow

Inactive Publication Date: 2011-11-23
BEIHANG UNIV
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Problems solved by technology

At the same time, the long-wavelength (especially P-band) spaceborne π / 4 mode reduced polarization SAR system will be seriously affected by the ionosphere, which will cause the polarization plane of the SAR signal to rotate, and eventually the SAR image cannot correctly reflect the polarity of the surface target. chemical scattering properties

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  • Method for calibrating compact polarimetric SAR (Synthetic Aperture Radar) in long wave-length spaceborne pi/4 mode

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[0077] The method proposed in the present invention is verified by simulation experiments. The simulation verification is divided into two parts. The first part does not consider the scaler error and system noise, and verifies the accurate calibration results of the present invention under this condition; the second part considers the existence of the scaler error and system noise in the actual situation at the same time. , which verifies that the present invention still has high-precision calibration results under a certain scaler error and system noise.

[0078] Part 1: Not Considering Scaler Error and System Noise

[0079] In the simulation experiment, the given parameters, including the Faraday rotation angle Ω, the unbalance degree of the transmitting channel f 2 , receiving channel imbalance f 1 , the linearly polarized receive channel crosstalk coefficient δ 1 and δ 2 , and the scattering matrices of the four scalers in formula (2) are respectively substituted into ...

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Abstract

The invention discloses a method for calibrating a compact polarimetric SAR (Synthetic Aperture Radar) in a long wave-length spaceborne pi / 4 mode. The method comprises the following steps: 1, acquiring an estimation value of the degree of unbalancedness of a transmission channel; 2, acquiring an estimation value of a channel crosstalk coefficient of a vertical-launching horizontal-receiving component; 3, acquiring an estimation value of a Faraday rotation angle; 4, acquiring an estimation value of an unambiguous Faraday rotation angle by utilizing TEC (Total Electron Content) data provided bya global navigation satellite system; 5, acquiring an estimation value of the degree of unbalancedness of a receiving channel; and 6, acquiring an estimation value of a channel crosstalk coefficient of a horizontal-launching vertical-receiving component. By utilizing the method, accurate calibration still can be performed without scaler errors or system noise, and high-precision calibration can still be performed when the scaler errors and system noise exist. The method provided by the invention has important application value in processing the compact polarimetric SAR data in the long wave-length spaceborne pi / 4 mode represented by a P wave band.

Description

technical field [0001] The invention relates to a calibration method for a long-wavelength spaceborne π / 4 mode reduced polarization synthetic aperture radar (SAR), which belongs to the technical field of signal processing. Background technique [0002] The European Space Agency (ESA) recently proposed the P-band "Biomass" (BIOMASS) plan, which plans to develop and launch a spaceborne P-band SAR satellite, aiming to use spaceborne long-wavelength synthetic aperture radar to detect surface vegetation. Then invert the terrestrial carbon cycle to provide technical and theoretical support for research on global warming. The program has extremely important scientific significance and application value, and is still in the stage of technical exploration and demonstration. Forest biomass observation SAR has become one of the hot topics in the current international research frontier, and long-wavelength spaceborne SAR has great potential in retrieving land surface biomass, and has a...

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Application Information

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IPC IPC(8): G01S7/40G01S13/90
Inventor 陈杰尹巽军李卓李春升
Owner BEIHANG UNIV
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