基于延迟矢量跟踪环的变步长LMS空时滤波算法

为了克服空时联合抗干扰技术计算复杂度高、收敛速度慢、稳健性差的缺点,该文提出一种基于延迟矢量跟踪环VDLL的变步长LMS空时滤波算法——VD-ILMS算法。其中,VDLL通过粗捕获码的特殊结构为空时滤波提供参考信息;然后利用改进的变步长LMS算法压制干扰,增强卫星信号;最后,抑制掉干扰的导航信号用于VDLL跟踪,解算出伪距。仿真结果表明,改进的方法能够在降低计算量的同时有效地提高收敛速度,增强接收机的在强干扰环境下的稳健性,从而在一定程度上改善导航接收机的性能。

PRECONDITIONED METHODS FOR SPACE-TIME ADAPTIVE PROCESSING

This paper introduces the preconditioned methods for Space-Time Adaptive Processing(STAP).Using the Block-Toeplitz-Toeplitz-Block(BTTB)structure of the clutter-plus-noise covari-ance matrix,a Block-Circulant-Circulant-Block(BCCB)preconditioner is constructed.Based on thepreconditioner,a Preconditioned Multistage Wiener Filter(PMWF)which can be implemented by thePreconditioned Conjugate Gradient(PCG)method is proposed.Simulation results show that thePMWF has faster convergence rate and lower processing rank compared with the MWF.