通道不一致性对GPS天线自适应算法的影响  

Study on Effect of Channel Uncertainties on GPS Antenna Adaptive Algorithm

作　　者：张建军[1] 项建弘[1] 

机构地区：[1]中国西南电子技术研究所,四川成都610036

出　　处：《无线电工程》2010年第2期35-38,共4页Radio Engineering

摘　　要：GPS信号到达地面终端时通常非常微弱,极易受到传输环境和去其他信号的干扰。功率反演(Power-Inversion)算法应用于GPS自适应天线阵可以很好地抑制干扰信号,但由于阵列天线通道存在幅相不一致,这会对自适应抗干扰算法产生很大影响。通过对自适应天线阵列及通道不一致性进行建模,经过理论分析和计算机仿真,以QRD-SMI算法为例,验证了自适应算法在一定条件下能够克服天线通道不一致,从而有效地抑制干扰信号,所得结论有利于指导工程应用。The Global Positioning System (GPS) signals are very weak when they arrive to the ground,so they are very easy to be interfered by transmission environments and other signals.The adaptive antenna array of GPS can suppress interferences effectively based on the Power-Inversion (PI) algorithm.But the variance of gain and phase which exists among antenna channel takes bad effect on the performance of adaptive anti-interference algorithm.By using the antenna array model and academic analysis and the antenna channel discordant modeling with academic analysis and computer simulation,and by taking the QRD-SMI algorithm for example,it can be proved that the adaptive processing algorithm can overcome antenna channel uncertainties and suppress interferences under some certain conditions,and it has the advantage to engineering applications.

关 键 词：自适应算法 PI算法 通道不一致性 QRD-SMI算法 

分 类 号：TN828.5[电子电信—信息与通信工程]