跳频通信干扰抑制中的改进自适应对消技术

与传统阻塞式干扰对短波跳频通信的干扰相比,以通过侦查截获跳频的频率进行干扰的跟踪干扰方法对跳频的干扰更具有针对性。然而干扰信号的处理时间、干扰机与发射机接收机之间的距离等使得跳频信号与干扰信号存在时延。为解决以上问题,提出了一种基于二级最小均方(LMS)算法的自适应对消技术。同时,在理论分析的基础上重点对所提出的改进的LMS算法应用在FPGA平台上进行仿真实验。首先,通过Simulink仿真平台模拟有用跳频信号与干扰信号建立自适应算法仿真平台;其次,通过ISE软件仿真得到原始信号及抵消后的波形;最后,通过Matlab仿真得到抵消前后信干比数值。仿真实验表明该算法具有良好的抑制效果。

Research on Improved Adaptive Cancellation Technology in Frequency Hopping Communication Interference Suppression

Aimed at the problems that the frequency hopping signal and the interference signal are delayed due to the processing time of the interfering signal and the distance between the jammer and the transmitter receiver, an adaptive cancellation technique based on algorithm superposition least mean square (LMS) algorithm is proposed. At the same time, on the basis of the theoretical analysis, the proposed improved LMS algorithm is applied to the FPGA platform for simulation experiments. Firstly, the adaptive algorithm simulation platform targeted by the frequency hopping signal and the interference signal is simulated by simulink simulation platform. Secondly, the original signal and the offset waveform are obtained by ISE software. Finally, the signal to interference ratio is obtained by Matlab. The simulation results show that the algorithm is good in suppression effect.