WAAS Integrity Investigation for Canadian Latitudes.

摘要

The WAAS provides satellite-based augmentation of GPS for commercial aviation applications over the CONUS, Hawaii, Puerto Rico, Alaska, Canada and Mexico. The WAAS provides satellite clock, satellite orbit and ionospheric corrections for GPS users. NAV CANADA is working to implement the Canadian WAAS which will offer seamless service with the current WAAS. A concern for Canadian implementation, however, is the overall limited number of stations in the Canada, and the nature of ionospheric phenomena which may develop at higher latitudes. Therefore, to be able to evaluate WAAS performance at the Canadian latitudes during highly active ionospheric periods, Canadian ionospheric conditions must be simulated to determine if WAAS methods will provide the necessary integrity at Canadian latitudes. The ionospheric delays from 29 WRSs provided as input to the WAAS algorithm to obtain estimated ionospheric delays and associated error bounds. Both the current planar fit and future kriging methods are used.