一种基于正交投影的远近效应消除方法  

A Method of Near-far Effect Cancellation Based on Orthogonal Projection

作　　者：何巍巍[1,2] 李涛护[3] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]武汉大学,湖北武汉430072 [3]北京航空航天大学电子信息工程学院,北京100191

出　　处：《计算机与网络》2011年第16期42-45,共4页Computer & Network

摘　　要：针对卫星定位应用中常见的远近效应问题,对卫星信号之间的正交性进行理论分析,提出了正交投影算法,该算法从接收信号中提取并减去在强信号分量上的投影,以减轻强信号对弱信号的捕获干扰,且具有无需改动接收机的硬件结构和估计信号分量幅度等优点。通过仿真与传统的滑动相关方法进行了捕获性能比较。仿真结果表明:正交投影算法能够有效地减轻远近效应的影响。A common difficulty in the use of GPS navigation is the near-far effect, which the strong signal component prevents a conventional receiver from detecting the weak component. A new solution based on the orthogonality of navigational signal is presented in this paper. It constructs the orthogonal projection of the strong component and then cancels out this projection from the received signal to reduce the interference of the strong component on acquiring the weaker. This solution needs neither to modify the receiver＇s hardware nor to estimate the amplitude of the signal component. Simulation results show that the performance of near-far resistance of this new method compared with conventional sliding detector is improved obviously.

关 键 词：正交投影算法 远近效应 GPS 捕获 

分 类 号：TN967.1[电子电信—信号与信息处理]