基于高阶累积量的LPI雷达信号检测

低截获概率（LPI）雷达的广泛应用导致电子侦察系统难以从噪声中检测到LPI信号的存在。针对这一问题，提出一种基于多相滤波器组和高阶累积量联合处理的121雷达信号检测算法。该算法首先利用多相滤波器组实现信号在频域上的快速均匀划分，然后对输出的每个子带信号进行三阶累积量对角切片短时估计，有效抑制高斯噪声，并设计检测器对每个子带信号进行信号存在性检测，进而判断整个信号中是否含有有用信号。仿真结果表明，该方法的检测性能远优于传统的能量检测器，在信噪比大于-20dB时具有较高的检测概率。

LPI Radar Signal Detection Based on Polyphase Filter and High-Order Cumulant

For the problem that the low probability of intercept(LPI) radar signal is difficult to be intercepted by the current electronic reconnaissance systems,a novel detection method of LPI radar signal based on the polyphase filter banks and high-order cumulants is proposed.The input signal is split into many narrow frequency bands by polyphase filter banks rapidly,and Gaussian noises can be suppressed using the short-time estimation of the third-order cumulant on each narrow frequency bands.Detector is designed to detect the LPI radar signal.Finally simulation results illustrate that the performance of new methods is better than energy detector and have high detection probability when SNR is more than-20dB.