旁瓣对消抗炮瞄雷达同频干扰研究  

Study of Sidelobe Cancellation Against Common Frequency Jamming Resistance of Gun Directing Radar

作　　者：吕波[1] 梁四洋[1] 高强[2] 

机构地区：[1]军械工程学院电子与光学工程系,河北石家庄050003 [2]国防信息学院,湖北武汉430010

出　　处：《计算机仿真》2015年第6期9-12,17,共5页Computer Simulation

基　　金：军械工程学院2012年度科研基金资助(YJJXM12001)

摘　　要：研究同型号炮瞄雷达间同频干扰抑制问题。针对炮瞄雷达近距离密集布站时,极易受到强同频直达波干扰的问题,将旁瓣对消技术引入到同频干扰对抗领域。旁瓣对消技术在对抗非相干干扰时效果明显,但是对抗同频干扰等相干干扰时效果较差。分析了同频干扰情况下雷达工作脉宽与目标多普勒频移、重复频率与目标多普勒频移的比例关系对相干性的影响,提出了降低同频干扰与雷达信号相关性的措施,从而大幅度提高旁瓣对消抗同频干扰的性能。结果表明当目标信号的多勒频移是脉冲重频的整数倍时,旁瓣对消对同频干扰的对消量最小,等于输入干信比;当目标多勒频移是雷达脉宽倒数的整数倍时,旁瓣对消对同频干扰的对消量可大幅度提高约50d B。上述研究为雷达抗同频干扰提供了依据。This paper studies that the suppression of the common frequency interference between the same type of gun directing radars. In view of the strong common - frequency direct - path jamming among closely configured gun directing radars, sidelobe cancellation technique is introduced into the common frequency jamming resistance. The existing sidelobe cancellation technique has obvious effect on non -coherent jamming, but poor effect on coherent jamming such as common - frequency jamming. The influence of interference of same frequency radar pulse width and target Doppler frequency shift, repetition frequency and target Doppler frequency shift proportional relationship of coherence are analyzed. The measures to reduce the same frequency interference and radar signal correlation are put forward, which can greatly improve the sidelobe cancellation performance. The results show that when the target＇s Doppler frequency shift is integer times of pulse repetition frequency, the sidelobe cancellation improves the minimum amount, about inputting jamming to signal ratio. When the target＇s Doppler frequency shift is integer times of the re- ciprocal of pulse width, the sidelobe cancellation can greatly reduce common frequency jamming about 50dB.

关 键 词：同频干扰 旁瓣对消 旁瓣匿影 抗干扰 

分 类 号：TN97[电子电信—信号与信息处理]