Abstract: In order to obtain the high-precision position of the civil aviation aircraft before landing, this paper discusses a multi-sensor-based high-precision positioning method for the civil aviation aircraft. During the flight of the aircraft, the onboard data logger will record the GPS receiver, radio altimeter, inertial navigation system and other sensor data during the entire flight; after the aircraft lands, use the radio altimeter data and GPS data for position difference, and then Further optimization using inertial navigation data can greatly improve the positioning accuracy before landing. The results show that the positioning accuracy is greatly improved two kilometers before the entrance of the airport runway, and the vertical positioning accuracy can reach the meter level, which can meet the needs of subsequent investigations.

Key words: multi-sensor, aircraft, positioning, high-precision