基于宽带极化纯度估计的极化测量定标修正

doi:10.12305/j.issn.1001-506X.2024.02.07

摘要/Abstract

摘要：

对扩展目标极化散射特性进行测量时, 通常期望精确获得宽带高分辨条件下目标各散射中心的极化特征信息, 但由于各极化分量散射的信号对测试系统的正交极化通道存在能量泄漏, 会严重影响较弱的极化散射分量的测量准确性。基于极化散射测量定标原理与宽带高分辨极化测量表征模型, 分析了干扰量的产生原因以及对散射中心测试结果的影响机理, 提出了一种基于宽带正交极化纯度估计进而修正复杂目标极化测量结果的方法, 并通过对金属球、金属二面角组合和类弹头金属模型3类典型目标的实测, 验证了其有效性。

关键词: 极化散射矩阵, 极化定标, 高分辨, 雷达目标测量

Abstract:

It is usually expected to accurately obtain the polarization characteristic information of each scattering center of the target under broadband high resolution conditions when measuring the polarization scattering characteristics of extended targets. However, the energy leakage of the scattered signals of each polarization component on the orthogonal polarization channel of the testing system will seriously affect the measurement accuracy of weaker polarization scattering components. Based on the calibration principle of polarization scattering measurement and the characterization model of broadband high resolution polarization measurement, the causes of interference and the mechanism of its impact on the scattering center test results are analyzed. A method based on broadband orthogonal polarization purity estimation is proposed to correct the polarization measurement results of complex targets. Its effectiveness is verified through three typical target measurements: metal balls, metal dihedral angle combinations, and warhead-like metal models.

Key words: polarization scattering matrix, polarization calibration, high resolution, radar target mesurement

中图分类号:

TN959.1

白杨, 殷红成, 黄培康, 刘芳. 基于宽带极化纯度估计的极化测量定标修正[J]. 系统工程与电子技术, 2024, 46(2): 428-436.

Yang BAI, Hongcheng YIN, Peikang HUANG, Fang LIU. Calibration correction of polarization measurement based on wideband polarization purity estimation[J]. Systems Engineering and Electronics, 2024, 46(2): 428-436.

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散射中心	散射强度/dBsm
散射中心	hh	vh	hv	vv
A	5.96	-51.92	-51.34	5.86
B	-1. 47	-16.78	-16.82	-1.83

散射中心	散射强度/dBsm
散射中心	hh	vh	hv	vv
A	5.96	-85.44	-90.00	5.86
B	-1.40	-22.80	-22.81	-1.83

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