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.