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A building approach for space-borne polarization SAR Faraday rotation effect correction platform

A Faraday rotation and correction platform technology, applied in the field of signal processing, can solve problems such as 90° angle ambiguity

Inactive Publication Date: 2009-10-07
BEIHANG UNIV
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Problems solved by technology

[0013] 1. Purpose: The purpose of the present invention is to provide a construction method of a spaceborne polarimetric SAR Faraday rotation effect correction platform, which overcomes the deficiencies of the existing Faraday rotation effect correction methods and satisfactorily solves the existing Faraday rotation effect correction method. The 90° Angle Ambiguity Existed in the Rotation Angle Estimation Method

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  • A building approach for space-borne polarization SAR Faraday rotation effect correction platform
  • A building approach for space-borne polarization SAR Faraday rotation effect correction platform
  • A building approach for space-borne polarization SAR Faraday rotation effect correction platform

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Embodiment Construction

[0085] Since no P-band spaceborne linear full-polarization SAR system has been launched at home and abroad, the effectiveness of the processing platform proposed by the present invention can only be verified through simulation experiment data.

[0086] The following uses the calibrated real data of the P-band linear full-polarization SAR complex image of the NASA / JPL airborne AIRSAR system as the experimental data source, based on the Faraday rotation given by Quegan Effect on the general mathematical model of the influence of space-borne linear full-polarization SAR, generate the complex image data of space-borne P-band linear full-polarization SAR including the Faraday rotation effect by computer simulation, for testing the Faraday rotation effect estimation proposed by the present invention Availability of Processing Platforms.

[0087] The technical parameters of the airborne P-band full-polarization SAR complex image data used for the simulation experiment are shown in Ta...

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Abstract

The invention is a building approach for space-borne polarization SAR Faraday rotation effect correction platform, which has eight steps. Step 1: The linear-polarization SAR complex image data format processing; Step 2: The linear-polarization SAR complex image data memory block processing; Step 3: The complex covariance matrix calculation of SAR image data block; Steps 4: The imaginary part construction complex number statistics based on the complex covariance; Step 5: Calculate the phase angle of the complex number statistics to obtain the estimated value of the Faraday rotation angle omega; Step 6: Use the global navigation system TEC data to obtain the estimated value of Faraday rotation angle of non-ambiguity omega; Step 7: Use omega for correction processing on the effect of ionospheric Faraday rotation; Step 8: In accordance with Step 3 to Step 7, conduct the correction processing of Faraday rotation effect on each complex image data block until the completion of correction processing. The invention presents a complete solution to the angle ambiguity in the existing Faraday rotation estimation method and has a wide range of practical value and application prospect.

Description

(1) Technical field [0001] The invention relates to a correction processing platform for the ionospheric Faraday rotation effect of a spaceborne polarization synthetic aperture radar (SAR), in particular to a construction method for a spaceborne polarization SAR Faraday rotation effect correction platform suitable for long wavelengths. It belongs to the technical field of signal processing. (2) Background technology [0002] Spaceborne Synthetic Aperture Radar (SAR) is a space-to-Earth observation system that has developed rapidly in recent years. Because spaceborne SAR has all-weather and all-weather earth observation capabilities and has certain penetrating power, it is widely used in military reconnaissance, land surveying and mapping, resource detection, ocean observation and other fields. Space-borne SAR achieves space-to-earth observation by transmitting chirp signals and receiving echo signals scattered by the ground. During the propagation of the spaceborne SAR sig...

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Application Information

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IPC IPC(8): G01S7/40G01S13/90
Inventor 陈杰李卓杨威李琳李春升周荫清
Owner BEIHANG UNIV
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