This paper investigates techniques to sustain dualfrequency ionosphere performance when a dual-frequency airborne user loses all but one GPS frequency while descending into the radio frequency interference (RFI) field. In this paper, we are particularly interested in the case where the user transitions from L1-L5 to having L5only. That is because the uncertainty of the L5-only ionospheric delay...

The Local Area Augmentation System (LAAS) is intended to provide real-time differential GPS corrections with the high accuracy, availability, and integrity required for Category II/III landings. In order to meet these requirements, errors due to ionospheric effects must be bounded such that integrity is maintained with minimal loss of availability. This paper describes the process by which arch...

As one significant component of space environmental weather, the ionosphere has to be monitored using Global Positioning System (GPS) receivers for the Ground-Based Augmentation System (GBAS). This is because an ionospheric anomaly can pose a potential threat for GBAS to support safety-critical services. The traditional code-carrier divergence (CCD) methods, which have been widely used to detec...

GPS receivers have been profitably employed by researchers for investigations into ionospheric and atmospheric science. However, a number of improvements in measurement accuracy are necessary for today’s applications. The ionosphere has practical importance in GPS applications because it influences transionospheric radio wave propagation. Total Electron Content (TEC) is one of the parameters of...