基于分时双频的高频地波雷达海面目标探测  

Detection of targets on the sea surface using HF ground wave radar based on time-division dual frequency

作　　者：熊俊志[1] 杨子杰[1] 王勤[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《华中科技大学学报（自然科学版）》2007年第6期34-37,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高技术发展研究计划资助项目(2001AA631050)

摘　　要：提出了一种分时双频方法用以提高其目标探测性能.分析了分时双频雷达波形,针对分时双频探测引起的目标相干积累时间减少以及多普勒谱点不对齐等问题,利用非均匀傅里叶变换将其转换为一不适定问题,并利用Cauchy-Gaussian模型正则化方法进行外推处理,从而获得目标多普勒谱图.仿真结果表明该方法能够有效地消除海面移动目标的检测盲区,提高检测性能.When slow-speed targets are detected by HF ground wave radar, there would be some blind zones because of first-order sea clutters. A method is proposed to improve the targets detection using time-division dual frequency （TDDF）. TDDF radar waveforms were analyzed. For the problems of the reduction of targets coherent integration time （CIT） and the mismatch of Doppler spectrum caused by the detection using TDDF, the paper introduces NDFT to transforming it to an ill-posed problem. Then the targets Doppler spectrum could be acquired by extrapolation process based on Cauchy-Gaussian model regularization method. The simulation results show that the method can eliminate the blind areas of sea-surface moving targets detection effectively and enhance targets detestability largely.

关 键 词：高频地波雷达 分时双频 目标检测 正则化非均匀外推 

分 类 号：TN957.51[电子电信—信号与信息处理]