Method for calibrating long-wavelength satellite-borne CTLR-mode compact-polarized SAR

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 ground targets, and achieve the effect of high precision and simple processing flow

Inactive Publication Date: 2011-09-14
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Faraday rotation effect causes the polarization plane of the SAR signal to rotate, causing the

Method used

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  • Method for calibrating long-wavelength satellite-borne CTLR-mode compact-polarized SAR
  • Method for calibrating long-wavelength satellite-borne CTLR-mode compact-polarized SAR
  • Method for calibrating long-wavelength satellite-borne CTLR-mode compact-polarized SAR

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Embodiment

[0060] The method proposed in the present invention is verified by simulation experiments.

[0061] In the simulation experiment, according to the given parameters, including the Faraday rotation angle Ω, the unbalance error f of the receiving channel, and the crosstalk coefficient δ of the linearly polarized receiving channel 1 and δ 2 , the circularly polarized transmit channel crosstalk coefficient δ c , and the scattering matrix of the scaler:

[0062] S Gt 1 = 1 0 0 0 S Gt 2 = 0 0 0 1 ...

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Abstract

The invention discloses a method for calibrating long-wavelength satellite-borne CTLR-mode compact-polarized SAR. The method comprises the following steps of: 1, acquiring an estimated value of an unbalanced error of a receiving channel; 2, acquiring an estimated value of a crosstalk coefficient of a circular-polarized transmitting channel; 3, acquiring an estimated value of a crosstalk coefficient of a linear-polarized receiving channel; 4, acquiring an estimated value of a Faraday rotation angle; and 5, acquiring an unambiguous estimated value of the Faraday rotation angle by using total electron content (TEC) data of a global navigation satellite system (GNSS) to finish SAR calibration. By the method, the processing process is simple and the processing precision is high; and the application of the method in processing of the long-wavelength satellite-borne CTLR-mode compact-polarized SAR data represented by a P wave band is very important.

Description

technical field [0001] The invention relates to a calibration method for a long-wavelength space-borne circular polarization transmitting and linear polarization receiving (CTLR) reduced polarization mode synthetic aperture radar (SAR), which belongs to the technical field of signal processing. Background technique [0002] Forest biomass is one of the key links in the inversion of the global carbon cycle model, and it is of great significance to the study of major basic scientific issues such as the interaction between the global carbon cycle and climate change. Long-wavelength spaceborne SAR images have great potential in retrieving land surface biomass (Biomass), and have attracted great attention from major scientific and technological powers in the world in recent years. Forest biomass observation SAR has become one of the hot topics in the current international research frontier. The European Space Agency (ESA) has selected six new Earth probe missions represented by ...

Claims

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Application Information

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