基于时变AR模型的雷达ESM信号多径抑制

针对雷达ESM信号存在多径干扰，从而影响信号特征提取以及辐射源识别的问题，提出了一种多径抑制新方法．首先采用非线性能量算子方法对多径时延进行粗估计，再利用基于时间函数扩展的时变AR模型方法对信号进行预测．然后根据多径时延粗估计和预测序列，采用最小二乘方法精确估计时延和多径幅度因子．在此基础上，提出一种逐级抑制的多径信号滤波方案．对仿真信号和实测雷达辐射源信号进行实验，结果证明该方法可有效实现信号多径估计与抑制．

Multipath rejection of radar ESM signals based on the time-varying AR model

Usually, there is multipath interference in radar ESM signals, which will influence the correctness of feature extraction and emitter recognition. A multipath rejection method based on the time-varying AR model is proposed in this paper. First, the nonlinear energy operator method is used for the approximate estimation of multipath time delay. Then the time-varying AR model based on the time function is used for sequence prediction. And the precise multipath time delay and amplitudes factor are obtained by the LS method, on the basis of which a stepwise rejection method is proposed for the multipath signal filtering. Finally, experiments on simulation and actual radar emitter signals verify the correctness and efficiency of the proposed method for multipath rejection.