实时GPS L1软件接收机定位精度改进  

Improvement of Real-Time GPS L1 Software Receiver Positioning Precision

作　　者：翟传润[1] 徐敏[1] 战兴群[1] 张炎华[1] 

机构地区：[1]上海交通大学空天科学技术研究院,上海200240

出　　处：《上海交通大学学报》2008年第4期670-673,共4页Journal of Shanghai Jiaotong University

基　　金：上海市2005年科技攻关计划重大项目资助(05dz15006)

摘　　要：为了实现软件接收机实时性,码跟踪环中的本地码与所接收到的数字中频信号之间存在一定的码相位误差,这部分误差体现在软件接收机的伪距计算中,成为影响实时GPS软件接收机定位精度的主要因素.采用两种改进算法,不同程度地改进了实时GPS软件接收机的定位精度.其中,提高DLL分辨率只增加存储量而不需要增加计算量即可实现定位精度的显著改进,可以应用在实时软件接收机中.Code phase error between the local replica C/A code and received GPS signal will be enlarged in real-time GPS software receiver. In the process of pseudorange calculating, it is the main cause of poor positioning precision. This paper introduced two algorithms to improve positioning precision for real-time GPS software receiver respectively. Especially, one of the algorithms which increase the DLL resolution can greatly improve the positioning precision with reduced calculation load, although the trade off is a bigger storage space. This algorithm can be used in real-time software receiver.

关 键 词：全球定位系统 实时软件接收机 C/A码相关性 延迟锁定环 码相位误差 

分 类 号：P228.4[天文地球—大地测量学与测量工程]