一体化电子战系统中连续波干扰抑制研究

在雷达信号和通信信号一体化电子战系统中，需要处理的雷达信号和通信信号在时频域都是重叠的，存在很强的时频耦合，给信号检测带来很大的困难。讨论了作为干扰的强通信信号对宽带雷达脉冲信号非协作检测的影响，提出了一种基于分数阶Fourier变换的干扰抑制方法。该方法利用分数阶Fourier变换对不同信号的时域聚集特性，在分数阶Fourier变换域滤除干扰，提高了信号的信干比，改善系统对宽带脉冲的检测性能，该方法对存在多个通信干扰信号时仍然适用。仿真结果表明，该方法对提高系统检测宽带雷达脉冲信号的性能是有效的。

Research on Continuous Wave Interferences Suppressing of Integrated Electronic Warfare System

In the integrated non-cooperative detection system of radar and communication signals,the signals to be processed are mutual overlapped in time and frequency domain,so strong time frequency coupling is induced,which results in the signal detecting difficulty.The influence of the strong communi-cation signal which can be looked as interference on the wideband radar pulse signal detection is dis-cussed,and an interference suppressing method based on FrFT(Fractional Fourier Transform) is given.The method use the time frequency concentration characteristic of FrFT,and filter the interferences in Fr-FT domain,by which the SIR(Signal Interference Ratio) is increased,and the detection performance of the system is improved.The method is still available when more than one communication interference sig-nals exist.The simulation results indicate that the method is effective on improving the wideband radar pulse of the system.