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。%For the problem thin the low probability of intercept （LPI） radar sigral is difficult to be in- tercepted by the current electronic reconnaissance systems, a novel detection method of LPI radar sig- nal based on the polyphase fiher banks and high-order cumulants is proposed. The input signal is splitinto many narrow frequency bands by polyphase filter banks rapidly, and Gaussian noises can be sup- pressed 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 perfor-mance of new methods is better than energy detector and have high detection probability when SNR is more than - 20dB.
展开▼
