功率倒置自适应抗干扰算法的性能分析与仿真

摘要

功率倒置算法不需要知道接收信号的先验信息，能够使天线产生指向干扰方向的波束零陷，达到抑制干扰的目的。特别适合卫星导航、扩频通信等强干扰、弱信号环境的抗干扰应用。在对功率倒置自适应算法原理分析的基础上，利用LMS算法迭代计算功率倒置的最优权值，然后针对四阵元天线仿真了功率倒置算法在不同干扰条件下的抗干扰性能，以及迭代步长等因素对算法收敛性能的影响，验证了功率倒置算法的自适应抗干扰性能，从而为后续硬件工程实现奠定了基础。%The priori information of received signals is not required by power inversion algorithm, which can suppress jamming by producing the antenna nulling pointing to the direction of jam-ming signal. It is particularly suitable to the strong jamming and weak signals environment, such as satellite navigation and spread spectrum communication. The principle of power inversion al-gorithm is introduced firstly, and then the optimal weighted value is iteratively calculated with the LMS algorithm. At last,the performance of anti-jamming of power inversion algorithm and the influence of iterative step on convergence performance are simulated based on four element antenna arrays. The adaptive anti-jamming performance of the algorithm is verified. It is an im-portant base for the engineering application.