柱面共形阵列天线WSF算法DOA估计性能分析

Performance Analysis of WSF Algorithm DOA Estimation of Cylindrical Conformal Array Antenna

天线是无线电通信及探测系统的重要组成部分,在未来航天飞行器、移动通信以及声纳领域中,共形阵列天线的广泛应用将极大地提高系统的整体性能。在建立三维柱面共形阵列天线导向矢量数学模型的基础上,将经典高分辨DOA(Direction Of Arrival)估计方法——WSF(Weighted Subspace Fitting)算法应用到柱面共形阵列天线中,并详细分析推导WSF算法在柱面共形阵列天线中的估计方差和克拉美-罗界(Cramer-Rao Bound,CRB),通过计算机仿真实验分析了WSF算法在柱面共形阵列天线中的估计效果,给出了WSF算法在柱面共形阵列天线中DOA估计性能的评估。实验表明WSF算法的DOA估计方差随着信噪比和阵元个数的增加逐渐达到CRB。

Antenna is one of the most important parts of wireless communication and detection system, whose functions, tasks, configuration and weight are highly required in the study of mobile and space communication fields. The integral performance of the system would be highly improved for that the conformal array antennas will be used widely in the future aircraft, mobile communication and sonar, etc. , fields. WSF （Weighted Subspace Fitting） algorithm, a classical high resolution method （DOA）, is replanted into the cylindrical conformal array antenna through modeling its 3D steering vector in this paper. The estimation variance of WSF and CRB for cylindrical conformal array antenna are carefully derived, and finally the performance and effect of DOA of bearing estimation is analyzed via computer simulations. The estimation results are gradually reached CRB shown in the computer simulations with the increasing of SNR and elements in matrix.