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本文从极性重合相关器将讯号无限削波后去掉振幅方面的讯息再求相关,因而也是一种相位加工这一概念出发,分接收确定的等幅正弦讯号和接收起伏讯号两种情形,分析了最佳相位检测器和极性重合相关器的检测特性。对于接收确定的等幅正弦讯号来说,分析的结果表明最佳相位检测器的运算,和将讯号无限削波后再对原讯号求瓦相关(匹配)的运算完全相同,和用极性重合相关器对讯号求互相关近似相同。但极性重合相关器求自相关的检测特性则远逊于最佳相位检测器。对于接收起伏讯号来说,分析指出极性重合相关器的检测特性略逊于最佳相位检测器。例如对于虚警概率(?)=10~(-6),正确发现概率 D=0.99,采样数目 N_1=100的情形,两种系统要求的讯/噪比相差j约5分贝。因而对于实际应用来说,在强干扰的情况下接收确定的讯号时,宜采用无限削波后对原讯号匹配的系统,其检测特性接近于最佳接收机。在接收起伏讯号时,可采用极性重合相关器。总的来说,极性重合相关器的检测特性不如最佳相位检测器。这一结果和 Neyman—Pearson 定理相符。因为从相位方面依似然比检验准则指导得的最佳相位检测器,根据Neyman-Pearson 定理,在虚警概率保持固定的条件下,和其他相位加工系统比较应有最大的正确发现概率。
In this paper, from the polar coincidence correlator will be unlimited after clipping the signal amplitude and then remove the relevant information and therefore is also a concept of phase processing starting point, the sub-reception determined by the amplitude of the sinusoidal signal and receive the signal fluctuations in two cases, analysis The best phase detector and polarity coincidence correlator detection characteristics. For the reception of a fixed amplitude sinusoidal signal, the analysis shows that the operation of the optimal phase detector and the operation of infinitely clipping the signal and then de-matching (matching) the original signal are exactly the same and coincident with the polarities Correlator on the signal seeking cross-correlation is approximately the same. However, the detection characteristics of the autocorrelation of the polar coincidence correlator are far less than the best phase detector. For receiving the fluctuation signal, the analysis indicates that the detection characteristics of the polar coincidence correlator are slightly inferior to the optimal phase detector. For example, for the probability of false alarm (?) = 10 ~ (-6) and the correct probability D = 0.99 and the number of samples N_1 = 100, the difference between the two systems is about 5 dB. Therefore, for practical applications, receiving a certain signal under strong interference should adopt a system that matches the original signal after infinite clipping, and the detection characteristic is close to the optimal receiver. In receiving the fluctuation signal, the polarity of coincidence correlator can be used. In general, the polarity coincidence correlator has less detection characteristics than the best phase detector. This result is consistent with the Neyman-Pearson theorem. Because the optimal phase detector guided by the likelihood ratio test criterion from the phase, according to the Neyman-Pearson theorem, should have the maximum correct probability of detection compared with other phase processing systems when the false alarm probability remains constant.