舰载ESM多径增批信号识别研究

多径信号是导致"增批"现象的主要原因之一,受海面反射影响,舰载雷达侦察设备(ESM)更容易接收到多径信号,多径增批信号给信号识别带来了干扰,如果能够从接收信号中挑选出多径增批信号,不仅可以减少信号识别干扰,还可以利用多径增批信号获取目标更多的信息。为了正确识别多径增批信号,选择脉冲初始相位这个脉内指纹特征进行研究,构造了解析信号,利用希尔伯特变换求解解析信号虚部,由解析信号计算脉冲瞬时相位,通过搜索计算疑似多径脉冲配对之间的相位差来识别多径增批信号。仿真实验验证了方法的有效性。

Multipath Increasing-Batch Signals Recognition for Shipborne ESM

Multipath signal is one of reasons which lead to increasing-batch phenomenon. Under the influence of surface reflection, the shipborne electronic support measurement (ESM ) is apt to receive multipath signals. The multipath increasing-batch signals bring interference to signal recognition. If the multipath increasing-batch signals can be picked out from the received signals, we can not only reduce the interference, but also extract more target information. In order to recognize multipath increasing-batch signals correctly, the initial phase of pulse, which is the intra-pulse fingerprint, is researched and analytic signal is constructed. The imaginary part is computed by Hilbert transform and the instantaneous phase of pulse is calculated based on the analytic signal. The phase difference between the dubitable multipath pulse pairs, which is used for recognizing multipath increasing-batch signals, is computed through time slippage searching. The simulation proves the effectiveness of the presented method.