The 'GPS Navigation Sensor System Approach' (GNSSA) Module; A High Performance GPS Receiver for All Aircraft Precision Approach Applications Including CAT-IIIb

摘要

The GNSSA is a GPS receiver sub-assembly composedrnof a single printed-circuit card (PCB) which hosts twornindependent RF Decks; a Pentium? class processor;rnnumerous built-in test and self-monitoring provisions. Arncustom interface ASIC supports a wide assortment ofrndata interfaces, from conventional RS-232/422 with datarnrates exceeding 1Mbps, 9 ARINC inputs, and 5 ARINCrnindependent and fully monitored outputs to support allrnprecision approach applications.rnThe GNSSA is designed to meet and exceed the airbornernperformance required by DO-208, DO-229C (WAAS)rnand DO-253A (LAAS) and any certified ground stationrnapplications such the LAAS Ground Facility GPS SignalrnQuality Monitoring receiver. The software is developedrnin ADA according to DO-178B level A, but certified tornLevel B initially, upgradable to level A certification inrnanticipation of upcoming CAT-IIIb landing applications.rnThis paper describes in detail the GNSSA design andrndevelopment to meet the needs of all safety-critical,rnhigh-performance airborne navigation applications,rnspecifically precision approach including anticipatedrnLAAS CAT-IIIb requirements.