高频天波雷达回波信号的旁瓣抑制方法研究

为了压低或抑制信道均衡后回波信号的旁瓣电平,给出了在均衡器后增加失配滤波器的旁瓣电平抑制方法.仿真结果表明:增加均衡滤波器长度,也可以在一定程度上压低旁瓣电平,但是处理时间较长;在均衡器后增加失配滤波器,不仅可以有效压低旁瓣电平,而且处理时间较短.在实际应用中最好选用在均衡滤波器后增加失配滤波器的方法来抑制旁瓣电平,提高输出信号的信噪比,增加接收机的检测性能.

Sidelobe Suppression Method for Echo Signal of the HF Sky-wave Radar

In order to depress or suppress sidelobe level of echo signal after channel equalization,the sidelobe level of suppression method is given,that is,increase mismatch filter after the equalizer.The simulation results show that,increasing the equalization filter length,although can lower sidelobe level to a certain extent,but it has a longer processing time.If increasing the mismatch filter after the equalization,not only can effectively suppress the sidelobe level,and the processing time is shorter.So in practical applications,it is best to choose the method of increasing the mismatch filter after equalization filter to suppress the sidelobe level,so that improve the signal-to-noise ratio of the output signal and increase the detection performance of receiver.