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A Civil User Perspective on Near-Term and Long-Term GPS Modernization
Near-Term Long-Term GPS Modernization
2015/6/26
Sam Pullen is a Senior Research Engineer at Stanford University, where he is the director of the Local Area Augmentation System (LAAS) research effort. He has supported the FAA in developing LAAS and ...
Signal Deformations On Nominally Healthy GPS Satellites
Signal Deformations Nominally Healthy GPS Satellites
2015/6/26
This paper describes the collection and analysis of real data from twenty-four current, nominally healthy GPS satellites in the context of the ICAO second-order step (2OS) fault model.
Precise Phase Calibration of a Controlled Reception Pattern GPS Antenna for JPALS
Phase Calibration Controlled Reception Pattern GPS Antenna JPALS
2015/6/26
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 JPALS is the Shipboard Relative GPS (...
Performance Analysis and Experimental Validation of a Doppler-Aided GPS/INS Receiver for JPALS Applications
Doppler-Aided GPS/INS Receiver JPALS Applications
2015/6/26
The Joint Precision Approach and Landing System (JPALS) is the next generation aircraft precision approach and landing system being sponsored by US Department of Defense. This GPS-based system will pr...
GPS Receiver Performance Using Inertial-Aided Carrier Tracking Loop
GPS Receiver Performance Inertial-Aided Carrier Tracking Loop
2015/6/26
Radio frequency interference (RFI) has been a perplexing problem, affecting the navigation quality of the Global Positioning System (GPS). The presence of the RFI, or even hostile jamming, will reduce...
Evaluation of Two Types of Dual-Frequency Differential GPS Techniques under Anomalous Ionosphere Conditions
Dual-Frequency Differential GPS Techniques Ionosphere Conditions
2015/6/26
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 c...
Further Development of Galileo-GPS RAIM for Vertical Guidance
Further Development Galileo-GPS RAIM Vertical Guidance
2015/6/25
With the much anticipated deployment of Galileo, a new partner will rise on the sky of Global Navigation Satellite Systems (GNSS). Equally anticipated is the launch of the modernized block III GPS sat...
In the next ten years the number of pseudorange sources and their quality is expected to increase dramatically:The United States is going to add two new civil frequencies (L5 and L2C) in the modernize...
Performance of Hybrid Positioning System Combining GPS and Television Signals
Performance Hybrid Positioning System Combining GPS Television Signals
2015/6/25
In spite of the global coverage and the penetration into a daily life of GPS (global positioning system), GPS receivers have not been able to overcome the critical weakness of a GPS signal in indoor a...
Performance of TOA and TDOA in a Non-homogeneous Transmitter Network Combining GPS and Terrestrial Signals
Performance TOA TDOA Non-homogeneous Transmitter GPS Terrestrial Signals
2015/6/25
The time of arrival (TOA) and the time difference of arrival (TDOA) measurements are transformable to each other without a loss of information regarding positioning and thus the position estimations b...
Bounding Higher Order Ionosphere Errors for the Dual Frequency GPS User
Bounding Higher Order Ionosphere Errors Dual Frequency GPS User
2015/6/25
The advent of a second civil GPS frequency heralds a new phase of GPS performance. For single-frequency GPS users, the signal delay due to refraction through the ionosphere is the largest and most var...
Navigation Accuracy and Interference Rejection for an Adaptive GPS Antenna Array
Navigation Accuracy Interference Rejection Adaptive GPS Antenna Array
2015/6/25
In the Joint Precision Approach and Landing System (JPALS) both the differential GPS reference station and the airborne user will employ Controlled Reception Pattern Array (CRPA) antennas.
We present the design and implementation of a highly portable multi-antenna datalogging system which can log several minutes of multi-channel raw GPS L1 baseband.
Standalone GPS-Based Flight Inspection System
Standalone GPS-Based Flight InspectionSystem
2015/6/25
The Instrument Landing System (ILS) is the current primary landing guidance system worldwide. The Microwave Landing System (MLS) may also become important in the future. Since proper guidance is extre...
Multiple Hypothesis RAIM with Real-Time FDE and Forecasted Availability for Combined Galileo-GPS Vertical Guidance
Multiple Hypothesis RAIM Real-Time FDE Forecasted Availability Galileo-GPS Vertical Guidance
2015/6/25
The number of ranging sources for the aviation user is expected to increase with the Galileo system becoming fully operational over the next decade, and the projected launch of a modernized GPS III co...