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Extremely low frequency plasma turbulence recorded by the DEMETER satellite in the ionosphere over the Abruzzi region prior to the April 6, 2009, L’Aquila earthquake
ionosphere turbulence earthquake
2015/8/24
The present study analyzes the low frequency fluctuations of the magnetic and electric fields prior to the earthquake with magnitude M.6.3 on April 6, 2009, in the Abruzzi region in Italy. This includ...
The Effects of the Ionosphere and C/A Frequency on GPS Signal Shape:Considerations for GNSS-2
Effects Ionosphere C/A Frequency GPS Signal Shape Considerations
2015/6/29
By greatly increasing the chipping rate of the pseudo random noise (prn) code, it may be possible to measure the ionosphere (TEC) in near real time, by exploiting the dispersive nature of the ionosphe...
An Ionosphere Estimation Algorithm for WAAS Based on Kriging
Ionosphere Estimation Algorithm WAAS Based Kriging
2015/6/26
GPS alone cannot provide the integrity needed for air navigation. Several error sources deteriorate the precision of the position estimate. One of the largest and more unpredictable sources of error f...
Application of Spatial Statistics to Ionosphere Estimation for WAAS
Spatial Statistics Ionosphere Estimation WAAS
2015/6/26
Now that the Wide Area Augmentation System (WAAS)has finalized the algorithms providing Lateral Navigation/Vertical Navigation (LNAV/VNAV) service,an increasing level of attention is being given to th...
LAAS Ionosphere Spatial Gradient Threat Model and Impact of LGF and Airborne Monitoring
LAAS Ionosphere Spatial Gradient Threat Model Airborne Monitoring
2015/6/26
The ionosphere spatial gradient and its temporal rate of change in the vicinity of a LAAS-equipped airport are likely to influence the architecture required to meet the Category II/III precision appro...
Measurement Noise versus Process Noise in Ionosphere Estimation for WAAS
Measurement versus Process Noise Ionosphere WAAS
2015/6/26
One of the parameters driving the performance of the Wide Area Augmentation System (WAAS) is the Grid Ionospheric Vertical Error (GIVE). The GIVE bounds the estimation error of the ionospheric delay a...
With the successful implementation of the Wide Area Augmentation System (WAAS) for the North America, there is interest in implementing similar systems in other parts of the world. The ionosphere over...
Ionosphere Threat to LAAS: Updated Model,User Impact,and Mitigations
Ionosphere Threat LAAS Updated Model
2015/6/26
Several severe ionosphere storms have occurred in recent years that tripped the WAAS storm detector and caused partial WAAS service shutdowns. Under extreme conditions, these spatial gradients can thr...
Ionosphere Spatial Gradient Threat for LAAS: Mitigation and Tolerable Threat Space
Ionosphere Spatial Gradient Threat LAAS:Threat Space
2015/6/26
The ionosphere spatial gradients under extreme conditions are likely to influence the LAAS architecture,particularly for Category II/III precision approach and landing systems. In previous study, a “m...
LAAS Study of Slow-Moving Ionosphere Anomalies and Their Potential Impacts
Ionosphere Anomalies Potential Impacts
2015/6/26
Triggered by several severe ionosphere storms that have occurred in recent years, research has been done to studying those anomalies, the physics behind them, and their potential impact on augmented G...
Analysis of Ionosphere Gradient Using Japan GEONET Data
Ionosphere Gradient Japan GEONET Data
2015/6/26
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...
A Comprehensive Ionosphere Storm Data Analysis Method to Support LAAS Threat Model Development
Ionosphere Storm Support LAAS Threat Model
2015/6/26
Several recent papers have analyzed the potential threat of severe ionosphere spatial gradients on LAAS users [1-4]. To support this work, a comprehensive methodology has been developed to analyze WAA...
Verification of Low Latitude Ionosphere Effects on WAAS During October 2003 Geomagnetic Storm
Low Latitude Ionosphere Effects WAAS During Geomagnetic Storm
2015/6/26
The Federal Aviation Administration’s Wide Area Augmentation System (WAAS) provides high integrity GPS-based precision navigation service to users in the conterminous United States. In October 2003, o...
Position-Domain Geometry Screening to Maximize LAAS Availability in the Presence of Ionosphere Anomalies
Geometry Screening LAAS Availability Presence Ionosphere Anomalies
2015/6/26
All fault modes in the Local Area Augmentation System should be mitigated within the specified integrity risk allocation to guarantee the safety of a landing aircraft.However, monitoring within the LA...
Assessment of Nominal Ionosphere Spatial Decorrelation for LAAS
Assessment Ionosphere Spatial Decorrelation LAAS
2015/6/26
The Local Area Augmentation System (LAAS) is a ground-based differential GPS system being developed to support aircraft precision approach and landing navigation with guaranteed integrity. To quantita...