一种时频维联合处理的海面小目标检测方法  

Detection of Small Sea Surface Targets Based on Joint Time-frequency Domain Processing

作　　者：王冬华 沈洋 周骏 茆禹 WANG Donghua;SHEN Yang;ZHOU Jun;MAO Yu(No.8 Research Institute of CSSC,Nanjing 211153)

机构地区：[1]中国船舶集团有限公司第八研究院,南京211153

出　　处：《火控雷达技术》2022年第3期15-19,35,共6页Fire Control Radar Technology

摘　　要：对海雷达探测中,海杂波严重影响小目标的检测,为了提高雷达对海面小目标的检测性能,本文提出了一种频域维与时域维联合处理的方法。该方法先进行频域维检测,实时感知并迭代更新海杂波的中心频率与谱宽,接着根据迭代更新的中心频率对原始I/Q数据进行频谱搬移,然后进行相参处理并完成通道间恒虚警检测,最后进行时域维检测,通过判断回波信号距离-方位特性,剔除频域维检测带来的海杂波剩余。通过仿真及实验验证了该方法的可行性和有效性。In marine radar detection,sea clutter seriously affects the detection of small targets.A joint frequency-time domain processing method is proposed in this paper in order to improve the detection performance of radar in terms of small sea surface targets.Firstly,detection in the frequency domain is performed,and the center frequency and spectral width of sea clutter is calculated in real time and updated iteratively.Secondly,spectrum shifting of the original I/Q data is carried out based on the updated center frequency.Thirdly,coherent processing and inter-channel CFAR detection are completed.Finally,detection in the time domain is performed.The residual sea clutter is eliminated by using the range-azimuth characteristics of echo signals in the final step.The simulation and test results prove the feasibility and effectiveness of the proposed method.

关 键 词：海杂波 小目标检测 频谱搬移 迭代更新 频域检测 时域检测 

分 类 号：TN957.51[电子电信—信号与信息处理]