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针对低截获概率(LPI)雷达中相位编码(PSK)信号的二相编码(BPSK)、四相编码(QPSK)信号载频估计,提出了小波脊线迭代法下PSK信号载频提取技术及其抗噪性能,分析了其在载频提取中迭代初始参数选取、迭代结果精度以及发散点迭代等不足,给出了用于PSK载频提取的改进小波脊线。改进方法在发挥运算量小、抗噪性能的同时,提高了PSK信号载频估计精度。MATLA仿真验证了改进算法的有效性,表明其较传统相位差分法信噪比门限降低了5dB。
Aiming at the carrier frequency estimation of BPSK and QPSK signal of Phase Coding (PSK) signal in Low Intercept Probability (LPI) radar, the carrier frequency extraction of PSK signal under wavelet ridge iteration method and its Noise performance, the selection of iterative initial parameters in the carrier frequency extraction, the accuracy of iterative results and the iteration of divergence points are analyzed. The improved wavelet ridge for PSK carrier frequency extraction is given. The improved method can improve the carrier frequency estimation accuracy of PSK signal while giving a small amount of calculation and anti-noise performance. MATLA simulation verifies the effectiveness of the improved algorithm, indicating that its signal-to-noise ratio threshold is 5dB lower than the traditional phase difference method.