一种子阵级平面相控阵相干源超分辨新方法

A New Super-Resolution Method at Subarray Level in Planar Phased Array for Coherent Source

二维子阵级超分辨方法对于多功能相控阵雷达具有重要意义.提出了应用于相干源的子阵级WSF的信号模型.应用简化阵列流形是降低大型相控阵校正成本与代价的十分有效的途径.为此引入子阵级加权网络并构造出基于近似高斯方向图的简化阵列流形,使超分辨测向的灵活性大大提高.该方法克服了直接简化阵列流形方法测向范围无法调整且旁瓣源不能够被完全抑制的缺陷,与基于高斯方向图的简化阵列流形方法相比,运算代价得到显著降低,而测向性能却基本保持不变.仿真结果证实了所提出方法的有效性.

2-D super-resolution methods at subarray level possess important significance for multi-function phased array radar. The WSF method at subarray level suitable for coherent source is presented. The application of simplified array manifolds is a quite effective approach to reduce calibration cost and expense of phased array. Therefore, weighting network at subarray level is introduced so that simplified array manifold based on approximate Gaussian patterns is constructed, thereby the flexibility of super-resolution direction finding is improved greatly. This method overcomes the disadvantage of the method based on direct simplified army manifold whose available direction finding area can＇ t be changed and the sidelobe sources can＇ t be suppressed completely. Compared with the simplified array manifold based on the Gaussian pattems, cost and complexity of calculation is reduced remarkably and the direction finding performance is basically not degraded at the same time. Simulation results demonstrate the validity of the proposed method.