CFAR Analysis of Non-coherent Detectors in Generalized Pareto Distributed Sea Clutter
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摘要: 该文在广义Pareto分布海杂波背景下研究了单元平均(CA)和有序统计量(OS)两种非相干检测器的恒虚警(CFAR)性质，推导了两种非相干检测器的虚警概率公式，发现了两种检测器对杂波的尺度参数是恒虚警的。然而，两种检测器对杂波的散斑协方差矩阵结构和杂波形状参数是非恒虚警的。为了实现全场景的恒虚警检测，预先通过白化方法将具有相关性的海杂波去相关，并通过查表方法使用了匹配杂波形状参数、累积脉冲数和参考单元数的检测门限。在这种情况下，实验结果表明两种非相干检测器能确保全场景恒虚警。
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关键词:
- 广义Pareto分布 /
- 非相干检测器 /
- 恒虚警 /
- 海杂波
Abstract: In this paper, under the generalized Pareto distributed sea clutter, the Constant False Alarm Rate (CFAR) properties of Cell-Averaging (CA) and Order-Statistic (OS) non-coherent detectors are studied, the false alarm probability formulas of the two non-coherent detectors are derived, and it is found that the two detectors are CFAR with respect to the scale parameter of sea clutter. However, the two detectors do not have CFAR with respect to speckle covariance matrix structure and shape parameter of sea clutter. In order to ensure CFAR detection in the overall scene, the correlated sea clutter is decorrelated via whitening and the detection threshold matching the shape parameters of sea clutter, number of accumulated pulses, and number of reference cells is applied via lookup tables. In this case, the experimental results show that the two non-coherent detectors can ensure CFAR in the overall scene. -
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