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首页> 外文期刊>Journal of Computers >Computation of the Normalized Detection Threshold for the FFT Filter Bank-Based Summation CFAR Detector
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Computation of the Normalized Detection Threshold for the FFT Filter Bank-Based Summation CFAR Detector

机译：基于FFT滤波器组求和CFAR检测器的归一化检测阈值的计算

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—The FFT lter bank-based summation CFARdetector is widely used for the detection of narrowbandsignals embedded in wideband noise. The simulation andimplementation of this detector involves some problems concerningthe reliable computation of the normalized detectionthreshold for a given probability of false alarm. This paperpresents a comprehensive theoretical treatment of majoraspects of the numerical computation of the normalizeddetection threshold for an AWGN channel model. Equationsare derived for the probability of false alarm, Pfa, forboth non-overlapped and overlapped input data and thenused to compute theoretical upper and lower bounds forthe detection threshold T. A very useful transformation isintroduced that guarantees the global quadratic convergenceof the Newton-Ralphson algorithm in the computation of Tfor overlapped data with an overlap ratio not exceeding50%. It is shown that if the product of the number of FFTbins assigned to a channel for signal power estimation andthe number of input data blocks is relatively small, e.g.,less than 60, the theoretical normalized detection thresholdcan be accurately computed without numerical problems.To handle other cases, good approximations are derived.
机译：- 基于FFT LTER银行的求和CFardetector广泛用于检测嵌入在宽带噪声中的窄带信号。该探测器的模拟增值涉及关于误报的给定概率的归一化检测的可靠计算的一些问题。本文论文项对AWGN信道模型的标准化阈值的数值计算的综合理论处理。衍生的概率为假警报，PFA，禁区，不重叠和重叠的输入数据，而且为了计算阈值T. inteptrductuated的非常有用的转换，可以保证牛顿-Ralphson算法的全局二次趋同计算具有重叠率的TFOR重叠数据不超过50％。结果表明，如果分配给信号功率估计的信道的FFTBINS的数量和输入数据块的数量相对较小，例如小于60，则在没有数值问题的情况下精确计算理论归一化检测阈值。处理其他案例，导出良好的近似。

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