干涉仪与MUSIC算法的测向原理及精度对比

实际电磁环境中,在中频处理带宽内往往只有一个信号,此时是MUSIC算法还是干涉仪方法具有更高的测向精度未见公开定论。通过对MUSIC算法和干涉仪测向的原理分析,给出了二者的理论精度公式并进行了变形、比较,然后证明了MUSIC算法与干涉仪测向原理在二元阵、单信号情况下的等效性,仿真实验验证了在二元阵、单信号情况下干涉仪具有与MUSIC算法相同的渐近测向性能,而在单信号、多阵元条件下干涉仪的测向精度仅比MUSIC算法略低。这种分析对实际应用中测向算法的选择具有重要的指导意义。

Direction Finding Principles and Accuracy Contrast of Interferometer and MUISC

In practical environment, there is usually only one signal in the band of the intermediate frequency module. Either MUSIC or the interferometer perform higher accuracy is an open problem for the case of single source. The principles of MUSIC and the interferometer are presented in the paper and the equations of the accuracy of the two methods are given and analyzed. The equivalency of the two methods in principle is proved for the case of single source and two-element array. Simulation results show that the interferometer has the same accuracy with MUSIC for the case of single source and two-element array and a little poor accuracy than MUSIC for the case of single source and multi-element array. The analysis is useful for the selection between the interferometer and MUSIC for direction finding in applications.