(GNSS) Based Augmentation System Low Latitude Threat Model
Effects Of Southern Hemisphere Ionospheric Activity On Global Navigation Satellite Systems (GNSS) Based Augmentation System Low Latitude Threat Model December 2014 Submitted to: Servicos de Defesa e Technologia de Processos (SDTP) And The U.S. Trade and Development Agency 1000 Wilson Boulevard, Suite 1600, Arlington, VA 22209-3901 Submitted by Mirus Technology LLC Prepared by the Mirus Technology, LLC (with Contributions from FAA, Stanford University, INPE, ICEA, Boston College, NAVTEC, and KAIST) Principal Investigator: Dr. Navin Mathur Executive Summary Ground-based Augmentation System (GBAS) augments the Global Positioning System (GPS) by increasing the accuracy to an appropriately equipped user. In addition to enhancing the accuracy of GPS derived accuracy, a GBAS provides the necessary integrity of accuracy (to a level defined by International Civil Aviation Organization, ICAO) required for a system that supports landing of an aircraft at an airport where GBAS is available. In addition, a GBAS system is designed to ensure the process of integrity and required continuity of GBAS operations and associated operational availability. The integrity of GBAS is threatened by several internal or external factors that can be broadly classified into three categories namely; Space Vehicle (SV) induced errors, environmental induced errors, and internally generated errors. Over the last decade, the US Federal Aviation Administration (FAA) has systematically defined, classified, characterized, and addressed each of the error sources in those categories that apply within CONUS. These efforts culminated in approval of several GBAS Category-I approaches within CONUS at various locations (such as Newark, Houston, etc.). Through the process of GBAS development for CONUS, the aviation and scientific communities realized that the Ionosphere is one of the key contributors to GBAS integrity threat.
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