WAAS/LAAS Interference Test Results

Trent A. Skidmore and Fan Liu

Abstract:	Potential radio frequency interference to the Global Positioning System (GPS) and the FAA’s Wide Area and Local Area Augmentation System (WAAS 62 LAAS) is an important issue in GPS receiver design and the use of GPS for precision approach. To seek certification, GPS/WAAS receivers are subject to meeting the requirements specified in RTCA Minimum Operational Performance Standards (MOPS) for Global Positioning System / Wide Area Augmentation System Airborne Equipment. In addition, manufacturers may also consider Global Navigation Satellite System (GNSS) Sensor ARINC Characteristic 743A-1. This paper presents both the theoretical derivation of signal-to-noise requirements for broadband interference and measured test results. Tests were conducted on different GPS receivers at different interference levels, including the nominal signal and noise level, the WAAS MOPS broadband interference specification, and excessive interference. Results from various GPS receivers are compared with the theoretical calculations. This paper is of particular interest to: 1) GPSlWAASiLAAS manufacturers whose sensors must meet the performance standards and 2) Aviation authorities who are responsible for certifying GNSS sensors.
Published in:	Proceedings of the 1997 National Technical Meeting of The Institute of Navigation January 14 - 16, 1997 Loews Santa Monica Hotel Santa Monica, CA
Pages:	839 - 848
Cite this article:	Skidmore, Trent A., Liu, Fan, "WAAS/LAAS Interference Test Results," Proceedings of the 1997 National Technical Meeting of The Institute of Navigation, Santa Monica, CA, January 1997, pp. 839-848.
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