Research On Application Of DGPS To Marshalling Station Monitoring System

This dissertation researches the application of DGPS and geographic information system (GIS) for a railway station. It realizes the communication between PC and GPS receivers, differential treatment, electronic map generation and map matching algorithms, real-time monitoring and alarm to the shunting locomotives in the station, operation matching, displaying, storage and statistical analysis and so on. It researches the following key technologies:It introduces the structure of the GPS positioning system and the algouthm of pseudorange positioning.It analyses and researches the coordinate transformation algorithms in detail, and realizes the coordinate transformation between WGS-84 and Beijing 54.It researches and realizes pseudo range positioning system, including the receiver output format (NEMA0183 format and RINEX format), real-time satellite orbit calculation, and real-time calculation of pseudorange correction.It researches the electronic map of a railway station, realizes the transformation from traditional CAD map to the map of the station monitoring system, and discusses the map matching of the receiving data in the electronic map.This paper presents the design of DGPS marshalling station monitoring system, including the system work flow, hardware selection, the design of software, the establish of database and the transformation of GPS data, the processing of GPS data and display.