暗室条件下强干扰信号多径效应对调零天线导航接收机测试影响分析

在有限暗室条件下对自适应调零天线导航接收机进行抗干扰试验时,强干扰测试信号的多径反射功率经吸收、衰减后仍远大于导航信号,其是否影响调零天线抗干扰性能评估是决定测试可信度重要因素.基于多径下天线阵信号接收模型,通过对接收信号协方差矩阵分析,量化分析了多径信号引入与特征值、特征向量之间的关系;然后基于最小功率的调零模型,仿...

Analysis of Influence of Multipath Interference on Test of GNSS Array Anti-Jamming in Microwave Anechoic Chamber

When GNSS array anti-jamming performance is tested in microwave anechoic chamber, the power of multipath interference signal is still stronger than the navigation signal after absorption and attenuation. Whether the multipath affects the anti-jamming performance is an important factor of the test reliability. Based on the signal receiving model of antenna array, focusing on the covariance matrix of the received signal, the relationship between multipath signal and eigenvalue and eigenvector is analyzed in the paper. Then, based on power inverting model, the influence of multipath signal is simulated. The results show that when the strength difference between the interference and its multipath is less than a certain value, the null point of the array antenna will be pulled from the actual position; However, with the increase of the strength difference, the influence of multipath on the position of the null point decreases gradually.