New Advanced RAIM with Improved Availability for Detecting Constellation-wide Faults, Using Two Independent Constellations

摘要

There has been much interest in providing a robust LPV-200 service worldwide through the 2020s relying on RAIM. However, conventional RAIM methods that were developed for the en route through non-precision approach phases of flight and based on the assumption of at most a single fault at any given time are not adequate for LPV-200 applications. For these applications, constellation-wide faults may need to be considered, among which faults caused by erroneous Earth orientation parameters (EOPs) have been identified to be of particular concern. Inter-constellation comparison (ICC) methods, which were previously proposed to detect constellation-wide faults, do not provide as high an LPV-200 availability as desired. This paper presents a new method that can detect constellation-wide faults using two independent constellations and examines its LPV-200 availability. This method has been shown to be very effective in detecting the EOP fault and provides significantly higher LPV-200 availability than the ICC methods.