Development and Testing of the Stanford LAAS Ground Facility Prototype

Ming Luo, Sam Pullen, Junlin Zhang, Scott Gleason, Gang Xie, Jie Yang, Dennis Akos, Per Enge and Boris Pervan

Abstract:	With support from the U.S. Federal Aviation Administration (FAA), Stanford University has designed, implemented and tested a LAAS ground system prototype that performs the necessary Signal-in-Space (SIS) integrity monitoring functions. This prototype, known as the Integrity Monitor Testbed (IMT), is being used to evaluate whether the current Local Area Augmentation System (LAAS) ground system architecture meets the integrity requirements for Category I precision approaches. It also provides an infrastructure for work on enhanced LAAS ground systems. Tests of nominal (fault-free) IMT performance have been conducted using GPS signals received by three rooftop choke-ring antennas. In addition, specific classes of failures, such as satellite clock failures, have been injected into the IMT by a WelNavigate 40-channel GPS Signal Simulator and by the software insertion of failures into nominal data collected previously. These tests are done to verify that the IMT flags these failures sufficiently quickly to meet the Time-to-Alert and Mean-time-to-Detect requirements for Category I approaches. IMT test processes also provide an example set of evaluation tests for LAAS Ground Facility (LGF) certification. This paper summarizes the design of the IMT and its component integrity algorithms and presents the results of the first phase of nominal and failure testing. These results demonstrate the detection and exclusion capabilities of the IMT. Plans for future phases of testing and upgrades to the IMT software are also discussed.
Published in:	Proceedings of the 2000 National Technical Meeting of The Institute of Navigation January 26 - 28, 2000 Pacific Hotel Disneyland Anaheim, CA
Pages:	210 - 219
Cite this article:	Luo, Ming, Pullen, Sam, Zhang, Junlin, Gleason, Scott, Xie, Gang, Yang, Jie, Akos, Dennis, Enge, Per, Pervan, Boris, "Development and Testing of the Stanford LAAS Ground Facility Prototype," Proceedings of the 2000 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2000, pp. 210-219.
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