Bell system reference system
geocentric geodetic system
geodetic reference spheroid
World Geodetic System 84 Datum 1984
World Geodetic System 84， WGS84 1984
World Geodetic System 84
air data system and inertial reference system
altitude heading reference system
Attitude and Heading Reference System
Attitude And Heading Reference System Apparatus
attitude heading and position reference system
Attitude Heading Reference System
attitude reference system
automatic heading reference system
automatic position reference system
centralized reference system
Continuous Operational Reference System
连续运行卫星定位服务系统
连续运行参考站
连续运行卫星定位系统
连续运行参考站系统
连续运行参考系统