基于CORS网络的单频GPS实时精密单点定位新方法

利用单频接收机实现大范围、高精度快速实时定位是卫星大地测量研究的热点和难点问题之一.本文提出了一套基于连续运行参考站系统(CORS)的误差实时建模数据处理方法,设计并实现了一种新的GPS单频接收机实时精密单点定位服务方法.然后,利用山西省CORS网内一组实测动态数据,以及从湖北省CORS网和武汉市CORS网选取的一组实测静态数据进行测试,验证分析了所提出方法用于实时定位服务的可行性.结果表明:对于站间平均距离小于71 km的参考网,网内单频用户按照实时处理模式,在经过数秒钟的初始化后即可获得厘米级的动态精密单点定位结果.这为GPS单频接收机用户实现快速实时精密单点定位提供了一种可行的新方法.

A new kind of real-time PPP method for GPS single-frequency receiver using CORS network

The method of rapid and precise positioning using relatively cheaper single-frequency receivers in a wide area has become one of the research hot spot in the present satellite geodesy at home and abroad.The author has proposed a new real-time modeling method based on the regional CORS network.And a new precise point positioning service for single-frequency receiver is also designed and realized.Through serial analysis of practical examples from the CORS networks of Shanxi Province,Hubei Province and Wuhan in China,this paper testifies the feasibility of providing real-time positioning service for single-frequency users based on the methods developed.The results verify that,for the reference network with a station separation of less than 71 km,user′s single-differenced L1 ambiguity can be fixed within several seconds.Once the ambiguity is fixed,the single-frequency user could gain rapid and cm-level positioning service in absolute positioning mode.Our work provides a new way for the research of single-frequency rapid and precise point positioning.