摘要
基于软件无线电平台USRP X310及LabVIEW实现一种双基地短距雷达系统,用于近距离微弱慢动目标的探测。与传统双基地雷达需要独立参考信号完成同步不同,本系统利用收发天线直达波能量较高的特性及Chirp信号较强的自相关性,通过USRP X310的FPGA实现高精度时钟同步,降低了系统复杂度及上位机处理负荷。针对静态杂波及直达波干扰,给出一种基于子空间投影及相参积累的目标检测方法,该方法基于回波信号构建杂波子空间,将接收信号投影至正交于杂波子空间的信号子空间,并结合相参积累抑制干扰,提高目标检测的性能。系统实测数据处理结果证明该方法能有效提取微弱慢动目标信息,性能明显优于动目标指示(MTI)算法。
A bistatic short-range radar system based on software radio platform USRP X310 and LabVIEW was implemented to detect the weak slow.moving targets in short range.Unlike the traditional bistatic radar system,the proposed system does not need the independent reference signal for time synchronization,but adopts the high energy characteristic of transceiving antenna direct wave and strong autocorrelation of Chirp signal by means of FPGA of USRP X310 to realize the high.precision clock synchronization,and reduce the system complexity and processing load of PC-A target detection method based on subspace projection and phase.coherent accumulation is given to suppress the interference of static clutter and direct wave.The method is used to construct the clutter subspace on the basis of echo signal,project the receiving signal into the signal subspace orthogonal to the clutter subspace,and combine with phase.coherent accumulation to suppress the interference to improve the target detection performance.The processing results of the system measured data show this method can extract the weak slow-moving target information effectively,and the system performance is superior to that of moving target indicator(MTI)algorithm.
作者
姚伟伟
郑霖
杨超
乔新宇
YAO Weiwei;ZHENG Lin;YANG Chao;QIAO Xinyu(Guangxi Key Laboratory of Wireless Communication&Signal Processing,Guilin University of Electronic Technology,Guilin 541004,China;Science&Technology on Information Transmission&Dissemination in Communication Networks Laboratory,Shijiazhuang 050081,China)
出处
《现代电子技术》
北大核心
2019年第7期1-4,10,共5页
Modern Electronics Technique
基金
国家自然科学基金资助项目(61571143)
国家自然科学基金资助项目(61371107)~~
