Ionospheric slab thickness is defined as the ratio of TEC to maximum electron density of the F-region (NmF2), proportional to the square of the F2-layer critical frequency (foF2). It is an important parameter in that it is linearly correlated with scale height of the ionosphere, which is related to electron density profile. It also reflects variation of the neutral temperature. Therefore, ionos...

Strong ionosphere storms are a potential threat for the Local Area Augmentation System (LAAS). During these storms, very large spatial gradients of ionosphere delays might cause significant errors in user position estimation. Therefore, LAAS needs to continuously monitor ionosphere behavior in order to ensure integrity against the ionosphere anomalies. This paper introduces a new ionosphere mon...

ionospheric slab thickness is defined as the ratio of tec to maximum electron density of the f-region (nmf2), proportional to the square of the f2-layer critical frequency (fof2). it is an important parameter in that it is linearly correlated with scale height of the ionosphere, which is related to electron density profile. it also reflects variation of the neutral temperature. therefore, ionos...

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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...

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...

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 ...

Large spatial gradients in ionosphere delay are a potentially threatening error source for the Local Area Augmentation System (LAAS). Therefore a better understanding of the ionosphere behavior during strong magnetic storms is crucial for LAAS so that it can more accurately evaluate its integrity and availability during these events. In order to obtain spatially-dense information on severe iono...

We present data from the sixth Cassini flyby of Titan (T5), showing that the magnetosphere of Saturn strongly interacts with the moon’s ionosphere and exo-ionosphere. A simple electron ionisation model provides a reasonable agreement with the altitude structure of the ionosphere. Furthermore, we suggest that the dense and cold exo-ionosphere (from the exobase at 1430 km and outward to several T...