三峡库区航道的地理环境决定了航标遥测监控终端应具有低功耗、高精度定位及高可靠性等特点。终端采用双单片机架构设计，多层分级的数据处理方法，提高了终端的可靠性，功耗仅30 mA/4V；基于通用分组无线业务的虚拟专网(GPRS VPN)网络传送美国海运事业无线电委员会（RTCM）的差分数据，GPS定位精度达到0.9 m；基于S-57标准并进行适当的拓展作为数据管理和交换平台，以满足内河应用需求。系统已使用了近4年，经历寒暑变化，仍然可靠运行。

A remote terminal unit of pharos monitor system based on double MCUs is developed to lower its power cost down to 30 mA/4 V. Multi-buffer and multi-class are used to deal with pharos's data. RTCM is transferred through GPRS VPN to improve accuracy of GPS up to 0.9 m. The extended GIS based on S-57 is the platform for users. The system has been running in the Three Gorges along Yangtse River for almost 4 years, and it still works well.

吴允平（1971－），男，福建连江县人，博士，福建师范大学副教授，主要从事测控技术与智能系统、交通信息化的研究与教学