Polarimetric calibration technique based on natural distribution scenes and rare calibrator

A calibrator and calibration technology, which is applied to instruments, radio wave measurement systems, etc., can solve the problem of difficulty in obtaining distributed targets, and achieve the effect of enhancing applicability and robustness

Active Publication Date: 2012-03-28
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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Problems solved by technology

However, the specific distribution target calibration algorithm depends on people's deep understanding of the polarization characteristics of

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  • Polarimetric calibration technique based on natural distribution scenes and rare calibrator
  • Polarimetric calibration technique based on natural distribution scenes and rare calibrator
  • Polarimetric calibration technique based on natural distribution scenes and rare calibrator

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Embodiment Construction

[0080] Combine below Figure 1-Figure 24 The present invention is further described.

[0081] Experiment 1: X-band polarimetric SAR data on January 31, 2010

[0082] Using the X-band airborne polarimetric SAR data obtained by the 38th Institute of China Electronics Group in a certain place in Hainan, China on January 31, 2010, the image size is 7601*4901 pixels, figure 2 is the original HH polarization channel SAR image of the region.

[0083]First, according to Step I and Step II, the crosstalk factor is solved by using the information of the data itself in the imaging scene. After the crosstalk factor is calculated, the observed polarimetric SAR data can be compensated for the crosstalk factor to realize the polarization crosstalk determination of the data. mark. image 3 and Figure 4 The crosstalk degrees before and after polarization calibration of the experiment 1 data are given. The crosstalk items of the data before calibration are -18.79dB, -21.19dB, -18.78dB, -2...

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Abstract

The present invention relates to a polarimetric calibration technique based on natural distribution scenes and a rare calibrator, which is used for the calibration and correction of distorted polarimetric synthetic aperture radar (SAR) data. The present invention breaks the calibration bottleneck of domestic machine-borne polarimetric SAR data, and develops a technique which utilizes widely distributed natural ground objects for the crosstalk calibration of polarimetric data without the help of an artificial corner reflector and needs only one or a small amount of triple-sided corner reflectors for the calibration of the imbalance of polarimetric receiving channels. In addition, the technique uses the strength change of natural ground object scenes with wide similar radar backward scattering properties in the distance direction to fit out an antenna directional pattern, and fully utilizes polarimetric ground object information to correct all the polarimetric SAR channel data with the same antenna directional pattern, thereby retaining the polarimetric scattering characteristics of ground object targets before and after correction.

Description

technical field [0001] The invention belongs to the technical field of radar data processing, in particular to calibration processing of polarization synthetic aperture radar data. Background technique [0002] Calibration technology is the premise of any quantitative research on measurement data, and it is of great significance for understanding the performance of Synthetic Aperture Radar (SAR) system, describing the limitations of SAR system and improving system performance. At present, SAR data processing is developing from qualitative research to quantitative research. With the emergence of a large number of new SAR sensors with multi-frequency and multi-polarization imaging performance, the calibration technology has also developed rapidly, and gradually changed from single-channel calibration technology. Evolution to multi-channel multi-polarization calibration technology. Calibration requires that an accurate and quantitative description of the entire system paramete...

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Application Information

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IPC IPC(8): G01S7/40
Inventor 陈曦汪洋湛金童谭剑波江凯
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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