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Adaptive Array Processing for GPS Interference Rejection
Adaptive Array Processing GPS Interference Rejection
2015/6/26
One area of active interest in the GNSS community is determining the vulnerability of multi-antenna signal processing algorithms given calibration errors in antennas and analog front-end hardware. Err...
With its wide bandwidth and large amplitude spikes,atmospheric noise can dominate the Loran band (90-110kHz). Data collection efforts over the spring and summer of 2005 in Norman, OK and over th...
Effects of Signal Deformations on Modernized GNSS Signals
Signal Deformation Modernized GNSS Signals
2015/6/26
Satellite-based navigation requires precise knowledge of the structure of the transmitted signals.For GPS, accurate knowledge of the shape of the code correlation peaks is required to ensure no biases...
Analysis of Noise and Cycle Selection in a Loran Receiver
Analysis of Noise Cycle Selection Loran Receiver
2015/6/25
Thermal and atmospheric noise distort envelope measurements in a Loran receiver, and may cause the receiver to select the wrong cycle during signal acquisition. A cycle error would persist during sign...
With its large-amplitude and short-duration pulses,atmospheric noise, produced by electrical discharges within clouds, dominates the low-frequency spectrum. Unless mitigated, this noise, which enters ...
Ionospheric Scintillation Effects on GPS Receivers during Solar Minimum and Maximum
Ionospheric Scintillation Effects GPS Receivers Solar
2015/6/25
The ionosphere has practical importance in GPS (Global Positioning System) applications because it influences transionospheric radio wave propagation. Among various phenomena in the ionosphere, ionosp...
Multiple constellations and modernized GNSS signals promise to bring a wealth of ranging possibilities to navigation users. They offer improved geometry and redundancy, immunity to ionospheric errors,...
Evaluation of Deep Signal Fading Effects Due to Ionospheric Scintillation on GPS Aviation Receivers
Deep Signal Fading Effects Due Ionospheric Scintillation GPS Aviation Receivers
2015/6/25
Deep and frequent GPS signal fading due to strong ionospheric scintillation is major concern for aircraft navigation in the equatorial region during solar maximum periods. Deep signal fading can break...
The Signal Quality Monitor (SQM) is an integrity monitor for the Wide Area Augmentation System (WAAS). The monitor detects L1 signal waveform deformation of a GPS or a Geosynchronous (GEO) satellite m...
Validation of Multiple Hypothesis RAIM Algorithm Using Dual-frequency GNSS Signals
RAIM Algorithm Dual-frequency GNSS Signals
2015/6/25
A Multiple Hypothesis Solution Separation (MHSS) RAIM algorithm was developed at Stanford in recent years, with the purpose of meeting the stringent integrity requirements imposed by the Federal Aviat...
Skywave signals are an inherent part of low frequency transmissions such as Loran.Unfortunately for navigation users, skywave signals are a source of interference to the Loran groundwave signal used f...
Methodology and Case Studies of Signal-in-Space Error Calculation Top-down Meets Bottom-up
Signal-in-Space Error Calculation Top-down Meets Bottom-up
2015/6/25
Signal in space (SIS) errors are a major error source for the Global Positioning System (GPS). They are defined as any errors related to satellite transmission, mainly satellite position and clock err...
Design and Performance of a Minimum-Variance Hybrid Location Algorithm Utilizing GPS and Cellular Received Signal Strength for Positioning in Dense Urban Environments
Design Performance Minimum-Variance Hybrid Location Algorithm GPS and Cellular Received Positioning in Dense Environments
2015/6/25
This paper shows how the complementary advantages of GPS and cellular received signal strength (RSS) positioning methods improves hybrid location estimation performance in dense urban environments. In...
Characterization of Signal Deformations for GPS and WAAS Satellites
Characterization Signal Deformations GPS WAAS Satellites
2015/6/25
Signal deformations are caused by imperfections or faults in the signal generating hardware onboard the satellites.Left uncorrected, these can lead to range errors. Thus they need to be measured and u...
In the next few years GPS will start broadcasting civil signals suitable for aviation use on both the L1 and L5 frequencies. In addition, Galileo and other constellations will offer an even greater nu...