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A multitude of applications would benefit from precise indoor navigation. Anywhere from automating storage in warehouses to tracking firemen in hazardous environments would make such an endeavor worth...
Testing and Research on Interference to GPS from UWB Transmitters
Testing Research Interference GPS UWB Transmitters
2015/6/29
Ultra-Wideband (UWB) signal transmission is a potentially promising technology that is defined by a large fractional bandwidth. Most UWB systems are based on very short pulses of radio frequency energ...
A Local-Area GPS Pseudolite-Based Mars Navigation System
Local-Area GPS Pseudolite-Based Mars Navigation System
2015/6/29
Tasks envisioned for future generation Mars rovers sample collection, area survey, resource mining, habitat construction, etc.– will require greatly enhanced navigational capabilities over those posse...
Finding Source of Electromagnetic Interference (EMI) to GPS Using a Network Sensors
Electromagnetic Interference (EMI) GPS Network Sensors
2015/6/29
Any electromagnetic interference (EMI) to GPS must invoke a fast location and removal response, because of the high military and civilian reliance on GPS. In this report, we present an approach, which...
Improving GPS Coverage and Continuity:Indoors and Downtown
Improving GPS Coverage Continuity:Indoors Downtown
2015/6/26
These days, GPS use is being extended into areas where hitherto it simply was not available. For years, it has served society remarkably well for survey, aviation use, maritime use and a host of other...
We compared positioning performance of GPS and DGPS to that of GPS/DGPS integrated with non-interfering UWB transponders. Simulations of a simple test case predict 15% horizontal accuracy improvement ...
Estimation of ICAO Threat Model Parameters For Operational GPS Satellites
Estimation ICAO Threat Model Parameters GPS Satellites
2015/6/26
The ICAO Second Order Step threat model defines a class of signal deformations that present a potential integrity threat to GPS-based aircraft landing systems such as the Local Area Augmentation...
Sensitivity Analysis of the JPALS Shipboard Relative GPS Measurement Quality Monitor
Sensitivity Analysis JPALS Shipboard Relative GPS Measurement Quality Monitor
2015/6/26
The Joint Precision Approach and Landing System (JPALS) is being developed as a single replacement for the navigation, precision approach and landing systems currently used by military aircraft. Shipb...
Analysis of a Three-Frequency GPS/WAAS Receiver to Land an Airplane
Three-Frequency GPS/WAAS Receiver Land an Airplane
2015/6/26
This paper investigates the vertical guidance performance of a multiple frequency Global Positioning System (GPS) (L1, L2, and L5)/Wide Area Augmentation System (WAAS) receiver in the presence of incl...
An Inexpensive and Robust GPS/INS Attitude System for Automobiles
Inexpensive Robust GPS/INS Attitude System Automobiles
2015/6/26
Many of the sophisticated control systems of modern automobiles require measurements of the vehicle’s attitude. Commercial GPS attitude systems are the method of choice for measuring attitude in many ...
GPS Modernization:Capabilities of the New Civil Signals
GPS Modernization:Capabilities Civil Signals
2015/6/26
Currently, the Global Positioning System (GPS) is undergoing stunning changes that will enhance both military and civil capabilities. We say that GPS is being modernized. In fact, this modernization i...
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...
Performance Analysis and Architectures for INS-Aided GPS Tracking Loops
Performance Analysis Architectures INS-Aided GPS Tracking Loops
2015/6/26
Santiago Alban is a Ph.D. candidate in the Aeronautics and Astronautics Department of Stanford University. He received his B.S. in Aerospace Engineering in 1996 from the University of Texas at Austin,...
Paired Overbounding and Application to GPS Augmentation
Paired Overbounding Application GPS Augmentation
2015/6/26
The relationship between range-domain and position-domain errors remains an open issue for GPS augmentation programs, such as the Federal Aviation Administration’s Local Area Augmentation System (LAAS...
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 ...