阵面面向任意的机载相控阵雷达降维空时自适应处理

Reduced rank spacetime adaptive processing for arbitrarily looking phased array airborne radars

研究了机载雷达相控阵任意方向安装情况下降维空时二维自适应处理技术．由于阵列轴线与载机航线夹角α不为零，天线锥角余弦与载机航向锥角余弦（即杂波多普勒频率）的关系不再是与距离无关的线性函数关系，而是非线性函数关系，且依赖于距离，使得空时二维自适应处理（ＳＴＡＰ）较复杂．笔者对比分析了α＝０（正侧面阵）和α≠０（非正侧面阵）情况下杂波谱特征，探讨了ＳＴＡＰ机理，研究了先多普勒滤波预处理后多通道联合处理的降维ＳＴＡＰ方案，并分析了这种简化方案的性能．

This paper deals with reducedrank spacetime adaptive processing (STAP) for arbitrarily looking phased array airborne radars. When the angle, denoted by α, between the axis of a linear array (or subarray) and that of platform flight is not zero, the relationship between the Doppler frequency of clutter return and the cosine of the angle of arrival (from the flight axis) is a quadratic function depending on the range. In this case, the STAP is more complex. In this paper, we analyze the characteristics of the clutter spectrum in bath α=0 and α≠0 cases by comparison, then describe a reducedrank STAP scheme based on Doppler prefiltering. The computer simulations demonstrate its effectiveness.