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原文传递 High-Altitude ADS-B/GPS LPV Flight Tests on a NASA ER-2 Research Airplane.

题名：	High-Altitude ADS-B/GPS LPV Flight Tests on a NASA ER-2 Research Airplane.
作者：	Arteaga, R. A; Demidovich, N; Dinofrio, J; Greenlow, C; Nelson, J. G; Williams, T.
摘要：	Researchers from the National Aeronautics and Space Administration (NASA) Armstrong Flight Research Center (AFRC) (Edwards, California), the Federal Aviation Administration (FAA), and Regulus Group, LLC have teamed up to conduct a flight-test demonstration of an Automatic Dependent Surveillance-Broadcast (ADS-B) and Global Positioning System (GPS) Localizer Performance Vertical (LPV) guidance system on a high-altitude Earth Resources-2 (ER-2) research airplane (Lockheed Martin, Bethesda, Maryland). The unique ER-2 is a NASA-owned and operated airborne science version of the USAF/Lockheed Martin Aeronautics U-2S airplane. The research presents an ADS-B architecture and thorough analysis of GPS-based LPV approaches, emphasizing their pivotal role in enhancing precision and safety in aircraft surveillance and navigation to meet FAA certification standards. The advanced GPS LPV approach architecture builds on the existing GPS Satellite-Based Augmentation System (SBAS) avionics to provide increased lateral and vertical guidance precision, resulting in reduced lateral and vertical error margins compared to conventional Instrument Landing System approaches. The integration of avionics into the ER-2 proved to be highly challenging due to the unique military aircraft design, security protocols, and performance envelope. The most prominent challenge involved incorporating modern civilian avionics into the existing military legacy avionics. Flight-test objectives aimed to certify an ADS-B Out (1090ES) passive surveillance and GPS LPV SBAS system on the ER-2 platform for high-altitude science operations. From July through August of 2023, NASA carried out three flights in Palmdale, California, reaching altitudes of 65,000 ft mean sea level (MSL). Flights included GPS LPV approaches under Visual Metrological Conditions (VMC) in both Visual Flight Rules (VFR) and Instrument Flight Rules (IFR) constructs, descending to a Decision Height of 200-ft above ground level (AGL). The goal was to sustain the NASA ER-2 global mission of safety and operational efficiency to conduct science missions in the high- altitude flight regime.
总页数：	52 pages