基于空间域补偿的极化敏感阵列MUSIC测向算法

MUSIC Direction Finding Algorithm of Polarization Sensitive Array Based on Spatial Domain Compensation

摘要:

采用共形天线的反辐射导弹探测系统在对大入射角信号测向时,由于信号多路径、折射、绕射等情况产生的干扰,会直接被引入到极化敏感阵列空间谱估计理论模型中,从而导致测向误差偏大。针对该问题,基于均匀共形圆阵天线模型,提出了一种基于空间域补偿的极化敏感阵列多重信号分类(multiple signal classification, MUSIC)测向算法。该算法用误差补偿方法对空间域分量进行修正,结合MUSIC测向算法,构造四维极化敏感阵列空间谱函数,通过降维谱峰搜索实现目标信号的二维测向。经仿真验证,与经典极化敏感阵列MUSIC测向算法相比,所提算法修正了系统的前端误差,避免了测向过程中的空间域分量与算法理论模型失配问题,可实现对目标信号的高精度测向及跟踪。

Abstract:

Anti-radiation missile detection system with conformal antenna is used for direction finding of large incident angle signals. The interference caused by signal multipath, refraction and diffraction will be directly introduced into the model of the polarization sensitive array spatial spectrum finding theory, resulting in a large direction finding error. Aiming at the problem, based on conformal uniform array antenna model, a multiple signal classification (MUSIC) direction finding algorithm of polarization sensitive array based on spatial domain compensation is proposed. The algorithm adopts error compensation to correct the spatial domain components, which combine the music direction finding algorithm to construct a fourdimensional polarization sensitive array spatial spectrum function. And then applying the reducing dimension spectral peak search to achieve the two-dimensional direction finding of the target signal. Verified by simulation, comparing with the classical polarization sensitive array MUSIC direction finding algorithm, the proposed algorithm can suppress the front-end error of the system, avoid the mismatch between the spatial domain components and the theoretical model of the algorithm, and realize the high precision direction finding and tracking of the target signal.