双线阵目标左右舷分辨概率分析

基于二元假设检验理论,研究了双线列阵对目标方位左右舷分辨的正确和错误概率。根据阵列接收窄带信号的概率密度函数,定义了左右舷判决统计量,当信号快拍数足够大时,左右舷判决统计量接近正态分布,从而可得到窄带信号的左右舷分辨概率。利用子带信号左右舷分辨概率的频率加权或波束加权,得到频率或波束加权的宽带信号左右舷分辨概率。理论和数值分析表明,窄带信号的左右舷分辨概率取决于双阵间距,而宽带信号的左右舷分辨概率对阵间距的宽容性较大。

Probability analysis of target port-starboard discrimination by twin-line array

Using the detection theory of two hypotheses,we study the true probability and false probability of port-starboard discrimination(PSD) for twin-line array target signal.The port-starboard decision test statistics is defined based on the probability density function(PDF) of the received narrowband array signal.By the fact that the port-starboard decision test statistics approximates a normal distribution when the number of data snapshots is large enough,the narrowband PSD probability is easily derived.On the other hand,the wideband PSD probability is obtained by averaging the frequency or beam power weighted subband PSD probabilities.Theoretical and numerical results demonstrate that,the PSD probability of narrowband signal is influenced by the array spacing.However,the wideband PSD probability shows much robustness to the array spacing.