基于权值平滑的自适应调零算法研究与实现

Research and implementation of adaptive nulling algorithm based on weight smoothing

在卫星导航定位系统中,由于导航信号的功率较低,在到达地面时极易受到干扰,导致定位失败。自适应零陷技术可以有效地提高卫星导航接收机的抗干扰能力,然而由于常规的空时联合最小功率响应会时常出现零陷抖动,不能有效的对准干扰来向,从而导致接收机的抗干扰性能下降。对于该情况,本文提出对抗干扰算法中的权值进行平滑滤波处理的方法,并且通过仿真验证、FPGA实现、现场实测等手段验证了该算法的可行性。该方法可有效抑制系统权值以及零陷位置的抖动,从而提高抗干扰算法的稳定性和可靠性,对相关工程领域具有一定的参考价值。

In the satellite navigation and positioning system,due to the low power of the navigation signal,it is easy to be interfered when it reaches the ground,resulting in positioning failure.Adaptive null steering technology can effectively improve the anti-jamming ability of satellite navigation receiver.However,due to the common space-time combined minimum power response,null steering jitter often occurs,so the anti-jamming performance of the receiver can not be effectively aligned.In this case,the paper proposes a method of smoothing and filtering the weights in the anti-interference algorithm,and verifies the feasibility of the algorithm by means of simulation,FPGA implementation and field measurement.This method can effectively suppress the jitter of the system weight and the zero trap position,so as to improve the stability and reliability of the anti-interference algorithm,and has certain reference value for related engineering fields.