Differential positioning system base on GPS phone

Due to its popularity,GPS phone is used to replace expensive professional GPS receiver in some fields on less accuracy,which has became a trend.Improving GPS positioning accuracy of mobile phone has a wide application prospects.This paper studied on the real-time differential positioning system based on GPS phone,which uses position difference algorithm that base station broadcasts DGPS corrections and roving station real-time performs.It has some advantages,such as the higher positioning accuracy,the faster correction speed,the equipment is simple and easy to use.This paper analyzed the position error of DGPS and calculated the measured results.The test result indicated that the DGPS positioning accuracy improved 31 meters than absolute positioning based on GPS phone,positioning error of 4 meters,which could meet the accuracy requirement in some fields.