摘要
在机载预警雷达对海洋背景运动目标的探测过程中,雷达平台的高速运动状态使得海杂波多普勒谱发生严重展宽现象,影响目标的检测性能。针对此问题,空-时自适应处理是一种有效的杂波抑制技术,该技术利用杂波的空-时2维耦合特性进行杂波抑制。但相对于陆地杂波而言,海杂波的内部复杂运动特性使得杂波空-时谱发生展宽现象,导致杂波多普勒频率与空间锥角不再保持一一对应关系,从而影响杂波抑制效果。针对海杂波的运动特性,该文提出一种稳健的基于子空间投影的杂波抑制处理算法,所提算法通过滤波凹口自适应展宽技术和先滑窗滤波后自适应处理技术来提高杂波抑制的稳健性。最后通过仿真的海杂波数据和实测海杂波数据验证了所提算法的有效性。
During the marine moving target detection for airborne early warning radar, the high-speed movement of the radar platform causes the serious broadening of the sea clutter Doppler spectrum, which affects the target detection performance. To solve this problem, a clutter suppression method called Space-Time Adaptive Processing(STAP) is effective, which exploits the space-time coupling characteristics of clutter.However, compared with the land clutter, the motion characteristics of sea clutter lead to the broadening of the clutter space-time spectrum, resulting in the clutter Doppler frequency and the spatial cone angle no longer maintaining a one-to-one correspondence;thus the clutter suppression performance significantly degrades.According to the motion characteristics of sea clutter, a robust subspace projection method is proposed in this paper. This method improves the robustness of clutter suppression by using the adaptive notch broadening technique and the filter then adapt technique. Finally, the effectiveness of this method is verified through the simulation results and the real-measured sea clutter data.
作者
黄鹏辉
邹子豪
刘兴钊
廖桂生
王志城
陈筠力
刘艳阳
HUANG Penghui;ZOU Zihao;LIU Xingzhao;LIAO Guisheng;WANG Zhicheng;CHEN Junli;LIU Yanyang(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;National Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China;Shanghai Radio Equipment Research Institute,Shanghai 200090,China;Shanghai Academy of Space Technology,Shanghai 201109,China)
出处
《电子与信息学报》
EI
CSCD
北大核心
2021年第9期2680-2687,共8页
Journal of Electronics & Information Technology
基金
国家重点研发项目基金(2017YFB0502700)
国家自然科学青年基金(61801289)
上海航天科技创新基金(SAST2019-071)。
关键词
机载预警雷达
杂波抑制
空-时自适应处理
子空间投影法
海杂波
Airborne early warning radar
Clutter suppression
Space-Time Adaptive Processing(STAP)
Subspace projection method
Sea clutter
