Remote-Controlled, Continuously Operating GPS Anomalous Event Monitor

摘要

Continuous realtime monitoring of the Global Positioning System (GPS) to detect and flag satellite anomalous events remains a key factor in guaranteeing its integrity and availability for use in safety-of-life applications such as the Local Area Augmentation System (LAAS). The reference receivers used in such systems must be able to detect, measure, and differentiate between satellite anomalies and the many error sources such as interference, multipath, ionosphere and troposphere. Currently available receivers focus on achieving the best measurement accuracies for a given update rate. They largely lack the signal observability required for high-fidelity monitoring and have difficulty distinguishing between the various types of local or satellite anomalies. Most often, when severe anomalies occur, receivers simply report a loss of lock condition and no further insight can be obtained.rnOhio University's Avionics Engineering Center has been conducting research and development in the area of GPS transform-domain receivers with one of the main focal points being signal quality and satellite anomalous event monitoring [1]. This paper reports on the development and deployment of a remotely controlled, continuously operating GPS anomalous event monitor (GAEM).