Honeywell's DGPS Local Area Augmentation System Ground Station

Steve Serfling

Abstract:	Honeywell has introduced a Differential GPS (DGPS) Local Area Augmentation System (LAAS) that meets the requirements of RTCA/DO-217 (Minimum Aviation System Performance Standards DGNSS Instrument Approach System: Special Category I). Honeywell provides a total-system approach with both ground-based and airborne equipment. This paper describes Honeywell’s Fail Operational DGPS ground based equipment. Honeywell’s SLS-2000 Fail Operational DGPS Ground System is unique in that the architecture allows for continued operation in the presence of faults with less hardware than traditional systems. Basic system operation consists of multiple differential correction processors (DCP) that are synchronized by a fault tolerant clock resident in each processor function. Each DCP receives serial input data from remote GPS reference receivers to assure that all operations are performed using identical input data. The DCPs then calculate the differential corrections and perform multiple integrity checks on the GPS reference receiver. The output of each processor is compared (bit for bit) using a patented and proven Honeywell technique. Upon successful comparison, the data is output to the RF datalink for transmission.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	147 - 156
Cite this article:	Serfling, Steve, "Honeywell's DGPS Local Area Augmentation System Ground Station," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 147-156.
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