基于近似理想方向图的子阵级超分辨测向方法  

Subarray level super-resolution direction finding approaches based on approximate ideal patterns

作　　者：胡航[1] 景秀伟[1] 

机构地区：[1]哈尔滨工业大学电子与信息技术研究院,黑龙江哈尔滨150001

出　　处：《电波科学学报》2007年第4期646-651,658,共7页Chinese Journal of Radio Science

基　　金：航天支撑基金(No.2003-HG18)

摘　　要：二维子阵级超分辨测向应用于相控阵雷达具有重要意义。提出了子阵级MUSIC的数学模型并应用了简化的阵列流形。通过引入加权网络对子阵输出进行后处理,大大提高了阵列处理的灵活性。构造了基于近似理想子阵方向图的简化阵列流形。基于这一简化阵列流形的超分辨方法克服了基于直接简化阵列流形的方法的测向范围无法调整且旁瓣源不能够被完全抑制的局限性;与基于理想子阵方向图的简化阵列流形的方法相比,大大降低了运算代价,而测向性能却与之十分接近。仿真结果证实了所提出方法的有效性。The application of 2-D super-resolution direction finding approaches at subarray level to phased array radar has an importal measing. The mathematics model of MUSIC at subarray level was proposed and simplified array manifolds were adopted. Subarray outputs were post-processed by introducing a weighting network, which improved the flexibility of array processing greatly. The simplified array manifold based on approximate ideal subarray patterns was constructed. The super-resolution approach based on this array manifold can overcome the limitations of that based on direct simplified array manifold, that is, the available direction finding region can＇t be regulated and sidelobe sources can＇t be suppressed completely. Compared with the approach based on ideal subarray patterns, this approach can reduce computation cost largely, while performances of direction finding are very close. Simulation results demonstrate the validity of the presented approaches.

关 键 词：超分辨测向 子阵级相控阵 简化的阵列流形 子阵方向图 

分 类 号：TN957.51[电子电信—信号与信息处理] TN911.7[电子电信—信息与通信工程]