LAMBDA Orientation Algorithm of Double-Antenna Based on GPS/BeiDou Navigation System

Global Navigation Satellite System (GNSS) can not only provide the information in terms of location and time, but also the course angle of its carrier through the processing of multiple antennas and specific data. This orientation approach has the advantage of none accumulative error, and its orientation accuracy is high. In this article, a novel two-antenna orientation method is provided, where GPS/BeiDou(BD) satellite navigation system(SNS) is used to determine the course angle of aircraft. First, through the discussion of the satellite navigation system oriented method based on carrier phase, the GPS/BeiDou double difference combined observation model of GPS/BeiDou system is established, and the details of the proposed orientation method is put forward based on the carrier phase double difference data. Second, the integer ambiguity of the carrier phase is calculated through depth studied of the LAMBDA algorithm. Finally, the ambiguity resolution program and the course angle calculation program will be deduced, and these algorithms will be verified by simulation and hardware experiment system.