Based On The Public Network Differential Gps Technology

With development and improvement of GPS technology as well as the further exploration of application domains, it come into being a series of research hotspots which is related to the GPS positioning technology as the vehicle monitoring system being one of them. Due to the fact the accuracy of GPS positioning technology can not meet the requirements, differential GPS positioning technology came into being. The adoption of this technology makes the positioning accuracy greatly improved.Based on the vehicle monitoring system which has been developed, this paper has studied the differential GPS positioning technology with Internet and mobile communications network as data transmission links in order to improve accuracy of positioning and meet user's requirements for positioning accuracy. In this paper, we have studied the differential GPS technology theories, including measurement error, positioning theory and differential GPS positioning selection, and proposed the systematic design program on the basis of the comprehensive grasp of differential GPS positioning system. According to the design requirements, we have completed a series of preparatory work, including the test of coordinates of the base station, serial communication between PC and GPS, and some problems in the Internet data transmission that has been solved. Finally, in light of differential algorithm and model and functions of differential system, we have designed the software to realize differential system, get the differential data, and amendment coordinates of monitoring target with the result of achieving preset goal.