Gate-to-Gate with Modernized GPS, GALILEO and GBAS - Harmonization of Precision Approach Performance Requirements

W. Schuster, W. Ochieng

Abstract:	Satellite Navigation has become increasingly important in the optimization of the efficiency and safety within the aviation industry. ANASTASIA (Airborne New and Advanced Satellite techniques and Technologies in A System Integrated Approach) is a European Commission project within the Sixth Framework Program, with the basic objectives to define and implement future (beyond 2010) communication and navigation avionics based on satellite services, exploiting the multi-constellation and multi-frequency architectures in combination with multiple onboard sensors, to provide a worldwide gate-togate service. Included in the objectives are the preliminary development of advanced airborne systems for flight trial evaluation and the dissemination of results for standardisation activities. Studies have shown that stand-alone Global Navigation Satellite Systems (GNSS - GPS and GALILEO) or stand-alone GNSS augmented by Space Based Augmentation Systems (SBAS) cannot satisfy the demanding performance requirements of Category-II/III precision approaches or of surface movement. To satisfy these requirements, Ground Based Augmentation Systems (GBAS) are needed. To date, performance requirements have only been firmly established for the various phases of flight up to Category-I precision approach. Two methods have been used to derive the performance requirements for Category-II and III precision approaches: the ILS (Instrument Landing System) Look-Alike Method" and the "Autoland Method". The "ILS Look-Alike Method" is based upon the concept of matching system performance at the Navigation System Error (NSE) level through linearization of the ILS performance specifications at a given height. The "Autoland Method" is based on the idea of evaluating the required performance to protect the safety of the landing operation, rather than by extrapolating the equivalent NSE performance from existing ILS specifications. Both methods lead to significant discrepancies in the performance requirements. This paper analyses each method, and identifies key differences. Potential solutions to harmonize the performance requirements obtained from these two methods are proposed."
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:	437 - 448
Cite this article:	Schuster, W., Ochieng, W., "Gate-to-Gate with Modernized GPS, GALILEO and GBAS - Harmonization of Precision Approach Performance Requirements," 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. 437-448.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In