Initial Design and Performance Results of the University of Oklahoma LAAS Far-Field Monitor

Chad Davis, Andy Archinal, John Dyer, Hengqing Wen and John Fagan

Abstract:	This paper introduces the concept of a Far-Field Monitor (FFM) that transforms the Ground Based Augmentation System proposed by the Federal Aviation Administration, known as the Local Area Augmentation System (LAAS), into a closed-loop system. The FFM is a standalone device that emulates an airborne LAAS receiver. It is the intent of the FFM to attempt to neither predict the integrity of the system nor the probability of error, only to detect Hazardous Misleading Information (HMI) and alert the LAAS Ground Facility (LGF) of its presence. A design for a prototype is presented and the performance is evaluated. The ability of the FFM to emulate the performance of an airborne navigator is evaluated statistically in terms of Navigation System Error. This ability also evaluates the health and performance of the Global Positioning System (GPS) space vehicle (SV) fleet to provide ranging source quality information. Sections relating to the detection of HMI are evaluated in terms of the time to notification of the LGF once HMI exists in the service volume of the FFM installation. Additionally, coverage of HMI conditions is presented, and the ability of the FFM to detect these conditions is evaluated. The LAAS FFM implementation described in this paper was designed, constructed, and tested at the University of Oklahoma in an effort to evaluate the performance and necessity of such a system to a LAAS Ground Facility (LGF). This paper presents the results of ongoing testing at the University of Oklahoma. These results indicate that the Far-Field Monitor is a valuable addition to the LAAS System Architecture and can be easily integrated into any existing LAAS installation.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	379 - 385
Cite this article:	Davis, Chad, Archinal, Andy, Dyer, John, Wen, Hengqing, Fagan, John, "Initial Design and Performance Results of the University of Oklahoma LAAS Far-Field Monitor," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 379-385.
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