摘要
机载雷达接收端采用子阵处理时面临栅瓣杂波导致的复杂空时耦合分布,使主瓣波束方向存在多个由栅瓣杂波导致的检测性能凹口,目标检测性能恶化严重。针对此问题,该文首先分析了子阵处理中栅瓣杂波空时谱分布特性,并在此基础上提出了基于接收子阵波束设计的空时二维杂波抑制方法。该方法采用重叠子阵构型方案,通过子阵方向图设计形成在子阵间栅瓣区域处的宽凹口,实现对子阵间栅瓣区域杂波的预滤波。进一步构建子阵级空时处理器,由于栅瓣杂波已经在子阵内完成预滤波,避免了栅瓣杂波在空时二维平面上的耦合扩散,从而提高了杂波抑制和动目标检测性能。仿真结果表明,所提方法显著改善了栅瓣杂波区的输出信杂噪比损失性能。
Airborne radar receivers that utilize subarray processing face challenges owing to the complex spacetime coupling distribution caused by grating-lobe clutter.This results in multiple performance notches in the main beam,which severely affects target detection performance.To address this issue,we analyze the characteristics of grating-lobe clutter distribution in subarray processing and propose an approach for spacetime clutter suppression based on the design of a receiving subarray beam pattern.Our approach leverages an overlapping subarray scheme to form wide nulls in the regions between subarrays where grating-lobe clutter is prevalent through beam pattern design.This design facilitates grating-lobe clutter pre-filtering between subarrays.Furthermore,we develop a subarray-level space-time processor that avoids the grating-lobe clutter coupling diffusion in the space-time two-dimensional plane by performing clutter pre-filtering within each subarray.This strategy enhances clutter suppression and moving-target-detection capabilities.Simulation results verify that the proposed method can remarkably improve the output signal to clutter plus noise ratio loss performance in grating-lobe clutter regions.
作者
万福海
许京伟
廖桂生
王伟伟
WAN Fuhai;XU Jingwei*;LIAO Guisheng;WANG Weiwei(National Key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China;China Academy of Space Technology(Xi’an),Xi’an 710000,China)
出处
《雷达学报（中英文）》
EI
CSCD
北大核心
2024年第5期1061-1072,共12页
Journal of Radars
基金
国家自然科学基金(61931016,62071344)
陕西省自然科学基础研究计划(2023-JC-JQ-55)。
关键词
空时自适应处理
重叠子阵
栅瓣杂波抑制
子阵方向图
预滤波
Space-Time Adaptive Processing(STAP)
Overlapping subarray
Grating-lobe clutter suppression
Subarray beampattern
Pre-filtering
作者简介
万福海,博士生,主要研究方向为空时自适应处理、阵列信号处理;通信作者:许京伟,博士,副教授,主要研究方向为雷达系统建模、阵列信号处理、波形分集雷达(频率分集阵和空时编码阵列)等。xujingwei1987@163.com;廖桂生,博士,教授,主要研究方向为雷达系统技术与阵列处理、雷达稀疏成像处理等;王伟伟,研究员,主要研究方向为星载雷达技术、雷达动目标检测、合成孔径雷达成像、阵列信号处理等。
