Land Based JPALS Guidance Quality

E.E. Lagimoniere Jr, D. Rudy, B.R. Peterson

Abstract:	Both the Sea Based (SB) and Land Based (LB) Joint Precision Approach and Landing System (JPALS) have unique and application-specific requirements that govern the quality of guidance data needed for the system to perform its required operations. This paper describes recent validation efforts that explore the validity of currently defined Land Based JPALS guidance quality requirements and independently validates guidance quality requirements to support Precision Approach and Terminal Area Navigation operations. Precision Approach (PA) operations require the highest quality of guidance data for the obvious reason that these operations could result in catastrophic damage, and because the errors that are allowable before a catastrophic incident occurs are relatively small. To ensure that this operation can be safely executed within known statistical boundaries requires the imposition of certain accuracy, integrity and continuity requirements on the guidance data used. The analysis performed to evaluate these guidance quality requirements considered, for multiple configurations of aircraft types and landing field environments, the desired success rate for the operation and the various error sources present within the system components. The guidance quality requirements examined in this paper are evaluated and conclusions are drawn with regard to what guidance quality is necessary to support current Land Based JPALS capabilities. Terminal Area Navigation (TAN) operations, as defined for Land Based JPALS, include Take Off, Departure, Missed Approach, Rollout and Taxi. These operations are also critical to the success of Land Based JPALS and are potentially as hazardous. The investigation and development of guidance quality requirements for each of these TAN operations requires analysis similar to that of the PA case to identify corresponding accuracy, integrity and continuity requirements. These investigations made use of FAA, ICAO, RTCA and other supporting standards for background and comparison. The results of this paper are significant because they represent a critical analysis of the existing Land Based JPALS guidance quality requirements and provide independent validation of the guidance quality requirements needed to support Autoland and TAN operations, per current JPALS capabilities. This analysis also highlights where potential problems may exist in providing sufficient guidance quality to meet the desired performance requirements.
Published in:	Proceedings of the 19th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2006) September 26 - 29, 2006 Fort Worth Convention Center Fort Worth, TX
Pages:	696 - 704
Cite this article:	Jr, E.E. Lagimoniere, Rudy, D., Peterson, B.R., "Land Based JPALS Guidance Quality," Proceedings of the 19th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2006), Fort Worth, TX, September 2006, pp. 696-704.
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