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Scintillations effects on satellite to Earth links for telecommunication and navigation purposes
telecommunication navigation purposes
2015/9/14
Radio wave scintillations are rapid fluctuations in both amplitude and phase of signals propagating through the atmosphere. GPS signals can be affected by these disturbances which can lead to a comple...
Time-accurate simulation of helicopter rotor flows including aeroelastic effects
Time-accurate simulation helicopter rotor flows including aeroelastic effects
2015/7/1
The following work presents recent developments in the simulation of helicopter rotor flows in the hover and forward flight regimes. The simulations are carried out by solving the full time-accurate c...
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...
The Effects of Local Ionospheric Decorrelation on LAAS:Theory and Experimental Results
Local Ionospheric Decorrelation LAAS Theory Experimental Results
2015/6/29
Solar cycle 23 is expected to reach a maximum in the year 2000. This has produced a recent flurry of research about the possible adverse effects of the ionosphere on the millions of GPS users. The int...
Ionospheric Scintillation Effects on Single and Dual Frequency GPS Positioning
Ionospheric Scintillation Effects Dual Frequency GPS Positioning
2015/6/26
The low latitude ionosphere poses a challenge to both GPS users and Satellite-Based Augmentation System(SBAS) providers. Single and dual frequency GPS receivers used in low-latitude regions can suffer...
The Joint Precision Approach and Landing System (JPALS) is being developed to provide navigation to support aircraft landings for the U.S. military. One variant of this is sea based JPALS, which will ...
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...
Temporal Variation of Loran ASFs and their Effects on HEA Navigation
Temporal Variation Loran ASFs HEA Navigation
2015/6/25
Dr. Gregory Johnson is a Senior Program Manager at Alion Science & Technology. He heads up the New London, CT office which provides research and engineering support to the U. S. C