地物背景下的运动目标频域带宽合成方法  

Frequency domain bandwidth synthesis method for moving targets in ground clutter

作　　者：赵宏钟[1] 朱永锋[1] 付强[1] 

机构地区：[1]国防科学技术大学ATR重点实验室,湖南长沙410073

出　　处：《系统工程与电子技术》2011年第3期528-533,共6页Systems Engineering and Electronics

摘　　要：在频率步进雷达中,利用带宽合成技术进行距离成像,具有距离像不模糊范围大、栅瓣电平低等优点。但对地物杂波下的运动目标成像时,距离像信杂比低,并且栅瓣电平对多普勒频移很敏感。提出一种改进的频域带宽合成方案。首先研究了多普勒域抗杂波的参数设计问题,然后设计了二维杂波滤波器实现了抗杂波,最后利用脉间相参处理后的信号特性提出了一种运动补偿方法,有效抑制了距离像的栅瓣电平。外场试验结果验证了方案的优势。In stepped frequency radar,range profiling via bandwidth synthesis has advantages such as constructing range profiles with large unambiguous extent and low grating lobes.However,when profiling a moving target in ground clutter,the signal-to-clutter ratio of the range profile is low and its grating-lobe level is sensitive to Doppler shifts.Therefore,an improved bandwidth synthesis scheme is proposed.Firstly,a parameter design for Doppler domain anti-clutter is studied.Then,a 2-D clutter filter is designed to eliminate clutter.Finally,a motion compensation method derived from the signal properties after inter-pulse coherent processing is proposed,which suppresses the grating-lobe level of the range profile effectively.Results from a field experiment verify the advantages of the proposed scheme.

关 键 词：频率步进 带宽合成 距离高分辨 运动补偿 多普勒 杂波 

分 类 号：TN957.52[电子电信—信号与信息处理]