广域差分GPS中用户定位算法的研究

ALGORITHM OF USER STATION IN WADGPS

广域差分GPS中用户接收机多为较廉价的单频接收机 ,可以接收差分播发站发播的差分改正信号进行DGPS计算 ,由于WADGPS的算法和常规算法不一致 ,差分改正信号难以是标准的RTCM格式 ,因此必须研制专用的差分信号接收机和DSP运算平台 ,并在平台上集成用户定位的算法 ,用户定位软件可以实时对观测数据、差分改正信号进行解码 ,计算用户的三维位置和速度。

This paper introduces a positioning algorithm of user station in WADGPS. We select a trimble single frequency receiver SK8 which can track 8 satellites simultaneously. The receiver can be used for differential GPS applications. We design a special differential correction receiver and a DSP chip which integrates the process of user station positioning. The process not only decodes the message of SK8 and DGPS corrections, but also calculates the position and velocity as the output.