The greatest of constant false alarm rate processor (GO CFAR) is a useful architecture for adaptively setting a radar detection threshold in the presence of clutter edges. The GO CFAR input is often the envelope detected in-phase (I) and quadrature (Q) channels of the baseband signal (x/sub e/=/spl radic/(I/sup 2/+Q/sup 2/)). This envelope detection can also be approximated using x=a max{|I|,|Q|}+b min{|I|,|Q|} which requires less complex hardware (a and b are simple multiplying coefficients). The envelope GO CFAR processor and several envelope approximation GO CFAR processors are compared in terms of the probability of false alarm (PFA) performance. Closed-form expressions which describe the PFA performance are given and their accuracy evaluated. It is shown that for all cases, the PFA is proportional to the number of reference cells n for small threshold multiplier T and inversely proportional to n for large T. A region of intersection occurs where the PFA is the same for two different values of n. For example, at T'=1.68 in the |I|+|Q| GO CFAR (a=1, b=1) the PFA for n=1 is equal to the optimal n=/spl infin/ fixed-threshold PFA (PFA=0.112).
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机译：最大的恒定误报率处理器（GO CFAR）是一种有用的体系结构，用于在存在杂波边缘时自适应地设置雷达检测阈值。 GO CFAR输入通常是基带信号的同相（I）和正交（Q）通道检测到的包络（x / sub e / = / spl radic /（I / sup 2 / + Q / sup 2 /）） 。包络检测也可以使用x = a max {| I |，| Q |} + b min {| I |，| Q |}进行近似，这需要较少的复杂硬件（a和b是简单的乘法系数）。信封GO CFAR处理器和几种信封近似GO CFAR处理器在虚警（PFA）性能方面进行了比较。给出了描述PFA性能的闭式表达式，并评估了其准确性。结果表明，在所有情况下，对于较小的阈值乘数T，PFA与参考单元的数量n成正比，对于较大的T，PFA与n成反比。在n的两个不同值处，PFA相同时会出现相交区域。例如，| I | + | Q |中的T'= 1.68 GO CFAR（a = 1，b = 1）n = 1的PFA等于最佳n = / spl infin /固定阈值PFA（PFA = 0.112）。
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