Introduction Protecting Against Unsampled Ionospheric Threats (2008)
Todd Walter, Sriram Rajagopal, Seebany Datta-barua, Juan Blanch
Failure Detection and Exclusion via Range Consensus (2008)
Schroth, Georg, Ene, Alexandru, Blanch, Juan, Walter, Todd, Enge, Per
With the rise of enhanced GNSS services over the next decade (i.e. the modernized GPS, Galileo, GLONASS, and Compass constellations), the number of ranging sources (satellites) available for a...
Enhancements of the Range Consensus Algorithm (RANCO) (2008)
Schroth, Georg, Rippl, Markus, Ene, Alexandru, Blanch, Juan, Belabbas, Boubeker, Walter, Todd, ...
In anticipation of the future GNSS constellations becoming operational, it will no longer be possible to assume that the probability of failure for more than one satellite within a certain timeframe...
An Integrity Equation For Use With Space Based Augmentation Systems (2007)
Todd Walter Per, Todd Walter, Per Enge, Andrew Hansen
In recent years there has been widespread growth in the number of proposed Space Based Augmentation Systems (SBAS). Such systems are being developed by both civil authorities and commercial...
Richard Fuller, Donghai Dai, Todd Walter, Christopher Comp, Per Enge, J. David Powell
In recent years there has been widespread growth in the
Abstract Weighted RAIM for Precision Approach (2007)
The use of differential GPS is becoming increasingly popular for real-time navigation systems. As these systems migrate to safety-of-life applications (e.g. precision approach and landing), their...
Richard Fuller, Todd Walter, Sharon Houck, Per Enge
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...
Treatment of Biased Error Distributions in SBAS (2004)
T. Walter, J. Blanch, J. Rife, Todd Walter
The original protection level equations for SBAS assumed that all actual error distributions could be easily overbounded by zero-mean gaussian distributions. However, several error sources have since...
Robust Detection of Ionospheric Irregularities (2000)
Todd Walter, Andrew Hansen, Juan Blanch, Per Enge, Tony Mannucci, Xiaoqing Pi, ...
provide real-time differential GPS corrections and integrity information for aircraft navigation use. The most stringent application of this system will be precision approach, where the system guides...
WAAS MOPS: Practical Examples (1999)
Todd Walter Stanford, Todd Walter
The WAAS MOPS describes the method by which a Wide Area Augmentation System (WAAS) transmits its differential GPS corrections and integrity information to users in 250 bit messages. These messages...
Demonstration Of Waas Aircraft Approach And Landing In Alaska (1998)
Christopher Comp, Todd Walter, Richard Fuller, Andrew Barrows, Keith Alter, Demoz Gebre, ...
In August of 1998, a team of Stanford researchers demonstrated the e#ectiveness of the Wide Area Augmentation System #WAAS# to guide aircraft through precision approaches in Alaska. The #ight trials...
Ionospheric correction using tomography (1997)
Andrew J. Hansen, Todd Walter, Per Enge
The most demanding application of wide area di erential corrections to GPS is vertical positioning of aircraft on precision approach. Here the Wide Area Augmentation System (WAAS) combines accuracy...
Ionospheric estimation and integrity threat detection (1997)
Hansen's research is focused on ionospheric estimation using tomographic inversion and integrity monitoring of WAAS ionospheric corrections. Y.C. Chao is a Ph.D student of Aeronautics and...
A Proposed Integrity Equation for WAAS MOPS (1997)
Todd Walter Per, Todd Walter, Per Enge, Andrew Hansen
In recent years there has been widespread growth in the number of proposed differential augmentation systems for GPS. Such systems are being developed by both civil authorities and commercial...
A gyroscope clock for a null gravitational redshift experiment / (1993)
Thesis (Ph. D.)--Stanford University, 1994.