The Integrity Monitor Testbed and Multipath Limiting Antenna Test Results

Per-Ludvig Normark, Dennis Akos, Gang Xie, Sam Pullen, Ming Luo, and Per Enge

Abstract:	The Integrity Monitor Testbed (IMT) is a prototype of the Local Area Augmentation System (LAAS) Ground Facility (LGF). It is used to evaluate the integrity and continuity requirements on the LGF for Category I precision approach and as a research platform for Category II/III development. With support from the U.S. Federal Aviation Administration (FAA), Stanford University has developed IMT algorithms and has implemented them in real-time software with special emphasis on automated fault diagnosis and recovery. The IMT prototype platform is built from standard off-the-shelf hardware. Multipath Limiting Antennas (MLA) are expected to be an integral part in future LAAS systems in order to meet continuity and availability. In order to verify that Multipath Limiting Antennas do not pose any integrity threats and meets and/or improve the LGF requirements, Stanford has developed a interface to replay data collected from the FAA Technical Center’s LAAS Test Prototype (LTP). The LTP is used to evaluate the LAAS architecture and it is properly sited and equipped with four Multipath Limiting Antennas. However, currently it does not contain a full set of IMT integrity monitors. Applying the IMT algorithms to data collected using the FAA’s LGF prototype will provide insight into thresholds that could be expected from an actual LAAS installation. The paper briefly summarizes the Multipath Limiting Antennas and “virtual receiver” concept and how the LTP-IMT replay data interface is designed together with test results. Integrity test statistics and thresholds are compared using both SU/IMT data (survey grade antenna) and FAA/LTP data (MLA antenna) and examples of failure testing are presented.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	2596 - 2601
Cite this article:	Normark, Per-Ludvig, Akos, Dennis, Xie, Gang, Pullen, Sam, Luo, Ming, Enge, Per, "The Integrity Monitor Testbed and Multipath Limiting Antenna Test Results," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 2596-2601.
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