Study Of The Raim Prediction Program In Civil Aviation Of China

At present, the civil aviation is the use of the ground navigation system, the precision is low, waste of airspace resource, but also the ground navigation system error is with the aircraft from the navigation station distance increases. At present, Chinese civil aviaton is actively promoting the implementation of PBN technology, the GPS navigation system application in the civil aviation industry will be increasingly extensive, because GPS can not satisfy the PBN navigation in integrity requirements, must use the RAIM technology to monitor its integrity.But RAIM technical requirements receiver horizon has5or more geometric distribution better satellite, it is to work properly, so the RAIM in certain time and place is not used, the existence of "RAIM hole".If the RAIM is not available, airborne equipment cannot ensure the integrity of the results of GPS positioning, civil aviation safety still will be affected seriously.Civil Aviation Administration of China issued advisory circular AC-91FS-01"using the global positioning system (GPS) for route and terminal area IFR flight and non precision approach operation guide", requirement must be RAIM prediction before the plane takes off. RAIM prediction is in before the plane takes off, according to the GPS satellite position prediction, prediction of the position of the aircraft and the GPS satellite signal long-term statistical parameters, combined with the receiver in RAIM algorithm, to specify the location, specified time RAIM availability judgment, auxiliary ATC and dispatch release permit. Therefore, this article will mainly study RAIM prediction algorithm, civil aviation requirements and focusing on the the RAIM prediction algorithm simulation experiments, assessment of simulation results, and system software design.