Effectiveness of multinotch logic-product polarisation filters in radar for countering rain clutter
Effectiveness of multinotch logic-product polarisation filters in radar for countering rain clutter
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雷达中多陷波逻辑积偏振滤波器对抗雨杂波的有效性
DOI：
10.1049/ip-f-2.1991.0056
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
C. Hilgers
中科院分区：
文献类型：
--
作者：
A. Poelman;C. Hilgers
研究了多切口逻辑积（MLP）极化滤波器在雷达中增强雨环境下目标检测的适用性。分析使用后向散射模型的偏振时，环境是圆偏振照明。这些模型在很大程度上代表了飞机目标和雨云的实际后向散射行为。雨云回波的偏振起伏度是分析中的一个参数。评估结果提出的信号杂波比（SCR）和它的依赖性的配置和数量的凹口在MLP滤波器的可实现的改善方面。由于MLP滤波器基本上是非线性的，因此结果提供了对此类滤波器作为输入端SCR的函数的上限性能的了解。典型地，在线性单陷波偏振滤波器在SCR中给出最大8 dB改进的环境中，当输入处的SCR为0 dB时，非线性MLP偏振滤波器将给出至少14 dB改进。
The applicability of multinotch logicproduct (MLP) polarisation filters in radar to enhance target detection in a rain environment is investigated. The analyses use backscatter models in terms of polarisation when the environment is illuminated with circular polarisation. These models are, to a great extent, representative of the actual backscatter behaviour of aircraft targets and rain clouds. The degree of polarisation fluctuation of rain cloud returns is a parameter in the analyses. The evaluation results are presented in terms of achievable improvement in the signal-toclutter ratio (SCR) and its dependence on the configuration and number of notches in the MLP filter. As the MLP filter is fundamentally nonlinear, the results provide insight into the upperbound performance of such filters as a function of SCR at the input. Typically, in an environment where a linear single-notch polarisation filter gives a maximum 8 dB improvement in SCR, a nonlinear MLP polarisation filter will give at least 14 dB improvement when the SCR at the input is 0 dB.