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Strong ionosphere storms are a potential threat for the Local Area Augmentation System (LAAS). During these storms, large spatial and temporal gradients of the ionosphere component on the GPS signals could cause significant errors in user position estimation. Mitigating these errors is demanding for LAAS, especially for Category III LAAS. Dual-frequency GPS techniques are known to be an effecti...

Ionospheric perturbations in plasma parameters have been observed before large earthquakes, but the correlation between different parameters has been less studied in previous research. The present study is focused on the relationship between electron density (Ne) and temperature (Te) observed by the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite ...

The D-region of the ionosphere is remotely probed by ground-based radar. The method used is referred to as the partial reflection-drift experiment. The partial-reflection experiment is used to determine the horizontal-drift velocity of ionized irregularities in the ionosphere. If a point radio source is used, the stratified irregularities produce a diffraction pattern over the ground. By sensin...

Several recent papers have analyzed the potential threat of severe ionosphere spatial gradients on LAAS users [14]. To support this work, a comprehensive methodology has been developed to analyze WAAS Supertruth data as well as both raw and JPL-processed data from the IGS/CORS receiver network to search for anomalous gradients. Anomalous gradients that result from this method are used to popula...

Space weather events adversely impact the operations of Global Navigation Satellite Systems (GNSS). Understanding space mechanisms, interactions in atmosphere, and extent their are useful developing prediction mitigation models. In this study, hourly lightning occurrence its on ionospheric disturbances, quantified using Rate Total electron content Index (ROTI), were assessed. The linear correla...

A radio wave correlation experiment using a Mills Cross technique can be used to observe the cosmic noise intensity from the ground for the purpose of determining the absorption in the ionosphere. To ensure a time resolution of 10 to 20 s of the absorption observations, it is necessary that the autocorrelation function of the signal received within a wanted spatial resolution and in a given rec...

This paper presents an innovative method to mitigate ionosphere delay error for single frequency receivers. Traditional approach to ionosphere delay correction is carried out through modeling the total electron content (TEC) along each satellite signal path. Because of the large deviation of the TEC during different times of the day, season, and solar cycle from any mean measurements, the ionos...

The Local Area Augmentation System (LAAS) provides differential GPS corrections for Category I precision approach to aviation users within tens of kilometers of the LAAS Ground Facility (LGF). To ensure integrity, any circumstance that may lead to hazardously misleading information (HMI) being transmitted to the user must be identified. If the probability of the situation exceeds the allocated ...