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雷达检测过程包括所接收的信号幅值对门限的比较。为了获得恒虚警率(CFAR),必须采用自适应门限来反映本地的杂波情况。例如,单元平均法就是一种自适应处理过程。本文利用由所谓有序统计量法(这种方法基本上不同于秩统计量法)选择出来的单值作为CFAR门限,并讨论了这种CFAR方法。特别在以估算本地杂波情况为基础的参考窗内出现一个以上的目标或者参考窗通过杂波边缘的情况下,这种有序统计量法与单元平均CFAR法相比,具有某些优点。
The radar detection process includes a comparison of the received signal amplitude to a threshold. In order to obtain a CFAR, adaptive thresholds must be used to reflect local clutter. For example, the unit averaging method is an adaptive process. In this paper, a single value selected by the so-called ordered statistic method (which is basically different from the rank statistic method) is used as the CFAR threshold and the CFAR method is discussed. This ordered statistical method has certain advantages over the unit-averaged CFAR method, especially when more than one target appears in the reference window based on the estimation of local clutter or the reference window passes clutter edges.