摘要
对现有STAP(Space-Time Adaptive Processing)单脉冲角度估计方法存在单脉冲比失真及目标多普勒失配时角度估计性能严重下降的问题,本文从数学上分析了常规STAP单脉冲方法的失效机理,并基于机载雷达杂波的空时耦合特性,将差波束约束条件扩展到空时二维空间,提出了基于空时联合约束的STAP单脉冲角度估计方法,将单脉冲曲线延伸为单脉冲曲面,通过空时联合约束显著提高了目标角度估计的精度和稳健性.计算机仿真结果验证了本文方法的有效性.
Because a monopulse ratio is distorted and a Doppler mismatch may occur, the performance of the existing space- time adaptive monopulse angle estimation is degraded severely, This paper gives mathematical analysis of the failure mechanism of the conventional space-lime adaptive monopulse method.In view of the space-time coupling characteristic of airborne radar clutter, this paper expands a cortstraint for difference beam to a space-time domain. A novel space-time adaptive monopulse angle estimation approach based on the space-time joint constraint is proposed,and a monopulse curve is extended to a monopulse surface. The accu- racy and robustness of angle estimation are improved by the space-lime joint constraint. Simulation results verify the validity of the novel method.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2015年第3期489-495,共7页
Acta Electronica Sinica
基金
国家自然科学基金(No.60925005
No.61102169)
关键词
机载雷达
空时自适应处理
角度估计
空时联合约束
单脉冲曲面
airborne radar
space-time adaptive processing （STAP）
angle estimation
space-time joint constraint
monopulse surface
