CAJ | 학술논문

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。
재뢰체신호화통신신호일체화전자전계통중，수요처리적뢰체신호화통신신호재시빈역도시중첩적，존재흔강적시빈우합，급신호검측대래흔대적곤난。토론료작위간우적강통신신호대관대뢰체맥충신호비협작검측적영향，제출료일충기우분수계Fourier변환적간우억제방법。해방법이용분수계Fourier변환대불동신호적시역취집특성，재분수계Fourier변환역려제간우，제고료신호적신간비，개선계통대관대맥충적검측성능，해방법대존재다개통신간우신호시잉연괄용。방진결과표명，해방법대제고계통검측관대뢰체맥충신호적성능시유효적。
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 signals exist. The simulation results indicate that the method is effective on improving the wideband radar pulse of the system.