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CARBON DIOXIDE MONITORING FROM THE GOSAT SATELLITE
Atmosphere Monitoring Global-Environmental-Databases Infrared
2015/7/29
Interoperation and Integration of Satellite Based Augmentation Systems
Interoperation Integration Satellite Based Augmentation Systems
2015/6/29
In recent years there has been widespread growth in the independent development of Satellite Based Augmenta tion Systems (SBASs). The Federal Aviation Admini stration’s Wide Area Augmentation System (...
Analytical and Experimental Observations of Ionospheric and Tropospheric Decorrelation Effects for Differential Satellite Navigation during Precision Approach
Ionospheric Tropospheric Decorrelation Effects Differential Satellite Navigation Precision
2015/6/29
The introduction of the Global Positioning System(GPS) ushered in a new era of affordable precise navigation.Differential GPS (DGPS) corrections have reduced positioning errors from about 100 meters t...
LAAS Monitoring For A Most Evil Satellite Failure
LAAS Monitoring Most Evil Satellite Failure
2015/6/29
The objective of Signal Quality Monitoring (SQM) is to improve integrity of the space segment of Local Area Aug mentation System (LAAS) by detecting satellite generated GPS signal faults. As seen in t...
GPS Receiver Satellite/Antenna Selection Algorithm for the Stanford Gravity Probe B Relativity Mission
GPS Receiver Satellite Antenna Selection Algorithm Stanford Gravity Probe B Relativity
2015/6/29
This paper presents a GPS receiver satellite/antenna selection algorithm for the Stanford Gravity Probe B Relativity Mission.
Flight Trials of a Geostationary Satellite Based Augmentation System at High Latitudes and for Dual Satellite Coverage
Flight Trials Geostationary Satellite Based Augmentation System High Latitudes Dual Satellite Coverage
2015/6/29
Several flight demonstrations have taken place over the past few years to show how the Wide-Area Augmentation System (WAAS), currently under development for the Federal Aviation Administration, will i...
Satellite Autonomous Integrity Monitoring and its Role in Enhancing GPS User Performance
Satellite Autonomous Integrity Monitoring Role GPS User Performance
2015/6/29
One of the difficulties inherent in use of Global Naviga tion Satellite Systems (GNSS) for safety-critical applica tions is the need to insure user integrity in the face of an unbounded array of...
L5 Satellite Based Augmentation Systems Protection Level Equations
L5 Satellite Based Augmentation Systems Level Equations
2015/6/25
The current L1 Space Based Augmentation System (SBAS) protection level equations were agreed upon nearly a decade ago. These equations are provided for L1-only users and are based upon covariance prop...
Using Loran for Broadcast of Integrity Information for Modernized Global Navigation Satellite Systems (GNSS)
Using Loran Broadcast Integrity Information Modernized Global Navigation Satellite Systems (GNSS)
2015/6/25
The United States (US) Federal Aviation Administration (FAA) has been examining the potential of using an enhanced Loran (eLoran) to provide back up for aviation. The 2004 FAA Loran technical evaluati...
Providing Integrity for Satellite Navigation:Lessons Learned (Thus Far) from the Financial Collapse of 2008 – 2009
Providing Integrity Satellite Navigation Financial Collapse
2015/6/25
This paper examines the failures in risk assessment and risk management that contributed directly to the worldwide financial crisis of 2008 - 2009 and identifies lessons that are applicable to risk ma...
GPS in Mid-life with an International Team of Doctors:Analyzing IIF-1 Satellite Performance and Backward-Compatibility
GPS Mid-life with International Team Doctors:Analyzing IIF-1 Satellite Performance
2015/6/25
With the launch of the first GPS IIF satellite, IIF-1 or SVN 62 on May 27, 2010, the U.S. GPS enters its mid-life. The IIF-1 satellite is the very first GPS satellite with an operable L5 payload. The ...
The WAAS/L5 Signal for Robust Time Transfer:Adaptive Beamsteering Antennas for Satellite Time Synchronization
WAAS/L5 Signal Robust Time Transfer Adaptive Beamsteering Antennas Satellite Time Synchronization
2015/6/25
Geostationary satellites of the Wide Area Augmentation System (WAAS) offer a novel, robust, and cost-effective means of synchronizing time at widely-separated ground facilities, to levels of ~50ns, wi...
Measuring Code-Phase Differences due to Inter-Satellite Hardware Differences
Measuring Code-Phase Differences due Inter-Satellite Hardware Differences
2015/6/24
This paper focuses on the hardware demonstration of pseudorange domain errors from nominal signal deformation, as seen at the output of actual hardware receivers.
The Need for a Robust Precise Time and Frequency Alternative to Global Navigation Satellite Systems
Robust Precise Time Frequency Alternative Global Navigation Satellite Systems
2015/6/24
Positioning, Navigation, and Timing (PNT) services are key enablers of both essential safety and security applications and economically beneficial capacity and efficiency applications worldwide.
COMPARISON OF TWO SATELLITE IMAGING PLATFORMS FOR EVALUATING SAND DUNE MIGRATION IN THE UBARI SAND SEA (LIBYAN FAZZAN)
Sand dunes Sahara , Remote Sensing
2015/5/7
Sand dunes can change location, form or dimensions depending on wind direction and strength. Sand dune movements can be effectively monitored through the comparison of multi-temporal satellite image...