低重频短驻留悬停直升机检测技术  

Detection of Hovering Helicopter for Low Pulse Repetition Frequency and Short Dwells Radar

作　　者：王勇[1] 张楠[1] 岳三创[1] 杜力[1] 陈尹翔 WANG Yong;ZHANG Nan;YUE Sanchuang;DU Li;CHEN Yinxiang(Xi’an Electronic Engineering Research Institute,Xi’an 710100)

机构地区：[1]西安电子工程研究所

出　　处：《火控雷达技术》2019年第3期18-24,共7页Fire Control Radar Technology

基　　金：北方电子研究院有限公司青年科技创新基金(QNKJCX-2018005)

摘　　要：地面情报雷达远距离搜索时脉冲重复频率低、驻留时间短,基于时域周期性峰包的检测方法性能变差。本文提出了一种基于频域多普勒维展宽的悬停直升机检测方法,通过检测沿多普勒维的直线来检测悬停直升机。针对旋翼频谱能量沿多普勒维扩散信噪比较低的问题,本文通过脉冲间相参积累、波束间非相参积累以及圈间二进制积累等手段提高旋翼频谱信杂比,并通过较高虚警率的CFAR算法来检测旋翼频谱回波,最后通过Hough变换进行峰值检测完成直线检测并消除虚警,从而解决低重频短驻留低信噪比条件下的悬停直升机检测难题。相比时域周期性峰包检测算法,本文所提算法对雷达脉冲重复频率和驻留时间没有任何要求。实测数据处理结果说明了所提方法的有效性。Due to low pulse repetition frequency(PRF)and short dwells,detection of hovering helicopter using periodic peaks in time domain performs poorly for ground surveillance radar(GSR).A detection method based on Doppler spread characteristic of helicopter blades is proposed,which solves the problem by detecting the straight line along the Doppler dimension.Aiming at the low SNR of the spectral energy of the rotor,three energy accumulation methods are proposed,including inter-pulse coherent accumulation,non-coherent accumulation between adjacent beams and binary accumulation between scanning circles.Then a CFAR detector with high false alarm rate is used to detect the low SNR echoes of the blades.Finally the hovering helicopter is detected by peak detection through the Hough transform.Compared to the periodic peaks detection method,the proposed algorithm is more suitable for GSR with low PRF and short dwells.The experiment result shows the effectiveness of the proposed method.

关 键 词：低重复频率 短驻留时间 悬停直升机检测 旋翼多普勒展宽 HOUGH变换 

分 类 号：TN951[电子电信—信号与信息处理]