This paper analyzes the components and features of GPS, discusses differential dynamic positioning technology with GPS in real time and its error sources.
分析了全球定位系统GPS的组成及功能，探讨了GPS实时差分动态定位技术及其误差来源。
2
The major error source of GPS systems, especially of differentialGPS, is the multipath signals. It will deteriorate the precision of positioning.
GPS测量，尤其是差分GPS测量，多径信号是主要的误差来源，会引起定位精确度的恶化。
3
For the test requirement of precision agriculture, differential systems of GPS position were adopted to increase the position accuracy of GPS system.