基于L-Wigner分布的多径ESM信号估计

Estimation of multipath ESM signals based on L-Wigner distribution

针对电子支援测量(electronic support measurement,ESM)信号存在多径干扰,从而影响信号特征提取以及雷达辐射源识别的问题,提出了一种基于L-Wigner分布的多径信号估计方法。首先分析了多径ESM信号模型和时频域匹配滤波算法,接着研究了L-Wigner分布对于多分量高阶频率调制信号的分辨性能,根据自身项和交叉项的不同特点,提出采用L-Wigner分布对多径信号进行估计。该方法计算简单,保证了估计结果具有较高的分辨性能。仿真实验结果证明了方法的正确性和有效性。

Usually, there exist multipath interference in electronic support measurement （ESM） signals, which will influence the correctness of feature extraction and radar emitter recognition. A multipath estimation method based on L-Wigner distribution is proposed. First, ESM signal mode and match filtering in time-frequency domain are analyzed. Then the resolution ability of L Wigner distribution is demonstrated for multicomponent higher order frequency modulated signals. According to the properties of self and cross terms, the L-Wigner distribution is used for match filtering in time-frequency domain. This method is simple in calculation and guarantees the high resolution ability of the estimation result. Finally, simulation experiments on intra- pulse frequency modulation signals verify the correctness and efficiency of the proposed method.