Differential GPS has been widely used nowadays. The data between reference station and mobile one is transmitted by RTCM SC-104.In this paper,both the thought and the flow of decoding program are emphasized.

• 差分定位技术的广泛应用和推广具有重要的经济意义,而参考站与流动站之间的数据传输是差分定位技术的重要组成部分,而两站间的数据传输正是以RTCM SC-104标准进行的。