Abstract:The prerequisite for retrofitting BeiDou Navigation Satellite System (BDS)airborne equipment in civil aircraft is to meet its airworthiness requirements. However, due to the differences between BDS and the Global Positioning System (GPS) in terms of constellation structure, signaling system and functions, the current airworthiness standards related to the Global Navigation Satellite System (GNSS) are not fully applicable to BDS airborne equipment. According to the integrity requirements of different airspace in the required navigation performance (RNP), and combining with the relevant airworthiness standards such as Radio Council for Aeronautics (RTCA) and industrial standards, the airworthiness compliance technology of the integrity of the Beta class BDS airborne receivers is researched. The weighted parity vector method is used as the theoretical basis of receiver autonomous integrity monitoring (RAIM), and a standardized test environment is established to propose test conditions, test methods, test procedures and airworthiness compliance indexes. It is set that the fault-free receiver can correctly detect system faults and eliminate faulty satellites with 99.9% probability and the probability of false alarms is 0.002/hour under the ideal test environment without interference sources. The test uses a trouble-free receiver to receive the broadcast ephemeris of the BDS B1C signal on February 4, 2024, and evaluates the RAIM performance for the BDS-3 system and based on the non-precision approach (NPA) phase in static and dynamic scenarios on a global scale. The research results can provide corresponding theoretical and methodological support for the airworthiness verification of BDS airborne receiver integrity applicable to non-precision approach and the following operation stages.
