一种新的子空间投影抗干扰改进算法

摘要

子空间投影算法是一类重要的天线阵抗干扰算法。在强干扰环境下，子空间投影抗干扰算法能够有效抑制强干扰，但同时也会造成有用信号损耗。本文从天线阵列增益的角度出发，提出一种基于子空间投影的抗干扰新算法，以有效降低有用信号损耗。仿真实验结果证明，本文提出的新算法可使阵列输出载噪比至少提高1.2dB。%Subspace projection algorithm is a kind of important GNSS (Global Navigation Satellite System)antenna anti-jamming algorithm.Under the condition of strong interference,subspace projection anti-jamming algorithm can suppress strong interference to the maximum extent,while it will also cause a large loss of useful signal.From the perspective of ar-ray gain,we propose a new GNSS system anti-jamming algorithm based on subspace projection to reduce the useful signal loss effectively,First,a general signal model of GNSS antenna array is established;then,on the basis of deriving the ex-pression of the interference suppression,improved algorithm proposed in this paper and subspace projection algorithm are compared and analyzed.Simulation results show that when the input noise ratio is 30dB,the array output carrier to noise ra-tio of the new algorithm is improved 1.2dB,compared with the subspace projection algorithm.