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Influence of Target Polarization Scattering Characteristics on the Detection Performance of Polarization Diversity Radar
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摘要: 针对全极化、混合极化和单极化3种典型体制的极化分集雷达(PDR)系统，该文分析了目标极化散射特性对系统检测性能的影响。基于目标极化散射统计模型和雷达接收电压方程，分别推导了3种体制下的目标回波向量的统计特性。在高斯背景下，设计了奈曼-皮尔逊准则下的最优极化分集多通道融合检测算法，并推导了虚警概率和检测概率的闭式表达式。仿真结果表明，当系统信噪比(SNR)一定时，目标极化散射分量间的相关性是影响系统检测性能的主要因素，特别是匹配极化散射分量和交叉极化散射分量间的相关性。此外，全极化体制和单极化体制的检测性能比混合极化体制稳健。Abstract: This study investigates the influence of the target polarization scattering characteristics on the detection performance of Polarization Diversity Radar (PDR) system with three typical working modes: full polarization mode, mixed polarization mode, and single polarization mode. The statistical properties of target echo signal corresponding to the three modes are separately deduced based on the statistical model of target polarization scattering and the receiving voltage equations. Furthermore, the optimal polarization diversity multi-channel fusion detection algorithm is designed under the Neyman-Pearson criterion in the background of Gaussian distribution, and closed-form expressions of probability of false alarm and detection are derived. The simulation results show that the correlations between the polarization scattering components of the target, particularly the correlations between the matched and cross polarization scattering components of the target, have greater effect on the detection performance of PDR for a given system Signal-to-Noise Ratio (SNR). In addition, the detection performance of the full and single polarization modes is more robust than that of the mixed polarization mode.
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图 1 极化分集雷达接收端信号处理原理框图
Figure 1. The schematic diagram of signal processing at receiver of PDR
图 4 检测概率与
$\rho $ 实部/虚部的关系Figure 4. Detection probability versus the real/imaginary part of
$\rho $ -
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