Accuracy, Integrity, and Availability of GLS-Based Autopilot-Coupled Aircraft Landings

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Abstract
The project Integrity of Satellite Navigation (ISAN) investigates the potential of GNSS (GPS and/or GLONASS) as part of a hybrid GNSS Landing System (GLS) for precision approach and landing down to Category (CAT) III. Specifically, accuracy, integrity, continuity of function, and availability are considered. The accuracy and continuity of function of the GLS were demonstrated in more than 400 flight tests in a commuter aircraft, and landing trials with a Boeing 757 aircraft during the Boeing Autoland Program. These flight tests demonstrated that the navigation system provides sufficient accuracy to perform landings according to suggested FAA requirements of CAT I to III. The present objectives of ISAN are the analysis and improvement of the system availability and establishment of a method to approve system integrity standards. A combination of GPS/GLONASS is considered for the GLS availability improvement. For reasons of integrity monitoring, satellite anomalies, atmospheric effects, and multipath problems on the signal-in-space, as well as GPS receiver failures, are taken into account in a GLS Closed Loop Simulation Test Bed installation, including a GPS Simulator to validate the system integrity in defined test scenarios.

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