GPS Risk Assessment for Civil Aviation

摘要

JHU/APL conducted an independent risk assessment (seernReference [1]) to determine the ability of GPS and itsrnaugmentations to provide navigation performance for thernfuture National Airspace System (NAS). The mainrnconclusions were: (a) GPS with appropriaternWAAS/LAAS configurations can satisfy the requiredrnnavigation performance as the only navigation systemrninstalled in the aircraft and the only navigation servicernprovided by the FAA; (b) Risks to GPS signal receptionrncan be managed, but steps must be taken to minimize therneffects of intentional interference (with assumed availablernsurveillance radars and with onboard anti-jam systems);rn(c) A definitive national GPS plan and managementrncommitment is needed to establish system improvements with civil aviation users and to provide greaterrninformational access to the civil aviation community.rnThe evaluation relied heavily on statistical simulationrnanalyses to assess performance of GPS, GPS/WAAS, andrnGPS/LAAS against requirements as expressed byrnaccuracy, integrity, continuity, and availability forrnOceanic through Category III Precision Approachrnoperations. The most significant risks and their associatedrnmitigations (if necessary) were also evaluated forrnacceptability. A significant technical contribution of therneffort was the unique simulation methodology used tornevaluate the very small probability values given in thernnavigation requirements. In addition, the assessment wasrnvery wide in scope and therefore, provided a consistentrnand comprehensive evaluation of GPS performance forrncivil aviation.