RTK-GPS系统设计及VRS差分方式分析比较

为了满足精细农业中对高精度定位数据的需求，该文使用低成本的RTK-GPS OEM板和无线通讯模块，设计开发了一套可采用VRS差分的GPS接收系统，并对北京市VRS系统的RTCM/CMR两种差分数据源格式、GPRS/CDMA两种差分数据无线传输方式的稳定性进行了分析比较。实验结果表明，设计开发的系统性能稳定；VRS差分数据源稳定可靠，可满足不同精度要求的GPS定位需求；CDMA无线传输方式引起的数据延迟小于GPRS方式，但通信成本较高，用户可综合考虑成本和精度两方面因素进行通讯方式的选择。

Development of RTK-GPS receiver system and comparison of VRS differential modes

In order to meet the requirements of high accuracy position in precision agriculture, the GPS Receiver system based on VRS differential was developed by using RTK-GPS OEM board and CDMA wireless communication module. RTCM/CMR data format and GPRS/CDMA wireless transform mode of VRS differential data were analyzed and compared. The experiment results showed, the VRS differential data have good reliability and stability; the CDMA wireless transform mode has less delay than GPRS mode, but the communication cost was higher than GPRS mode. Based on an overall consideration of cost and accuracy, different wireless transform mode can be used.