Blogs

Where Time and Space Meet

November 1, 2010By
overview

Increasing availability and performance of state-of-the-art navigation sensors motivates the need for a highly accurate reference system commonly referred to as a time-space position information (TSPI) device. The Advanced Navigation Center at the Air Force Institute of Technology is working with the Air Force Flight Test Center to develop a next generation time-space position information (TSPI) system to be used for test and evaluation of modern navigation devices. read more

This article is tagged with and posted in Aviation, Tech Talk

Kick It in and Push!

July 13, 2010By

By Alan Cameron The Elephant Charge (“Dust, Sweat, and Gears”), an annual off-road motorsport charity event, brings together competitors, their families, and supporters for a wilderness weekend of GPS-driven fun and frenzy in the Zambian bush. I’m for fun, but I always wince when I see folks tearing up habitat in the name of saving it. Elephant Charge 2010 seeks... read more

This article is tagged with and posted in All Blogs, Editor's Wide Awake Blog, Road, Transportation

World Domination: The Sequel

April 19, 2010By

Perhaps we should call this The Interquel rather than The Sequel, as the latter will take place September 23 in Portland, Oregon, during the ION GNSS 2010 Conference. In January, 12 brave individuals joined me in San Diego to see if this thing would work at all.  It did!  The exercise revealed many adjustments needed to the game, but overall,... read more

This article is tagged with and posted in All Blogs, Editor's Wide Awake Blog, GNSS

Research and Other Hard Things

April 1, 2010By

Once again, I reach into the mail bag to pull out this gem, from someone both high up and deep down in administrative matters relating to GPS and other technologies. Herewith:   Two quotes — with Some Accompanying Thoughts “If we knew what we were doing, it wouldn’t be called research, would it?” —Albert Einstein Too often these days we... read more

This article is tagged with and posted in All Blogs, Editor's Wide Awake Blog, GNSS

Wide Awake Bridging the Gap

March 30, 2010By

I gave this talk at the Munich Satellite Navigation Summit, in a concluding session titled “Bridging the Gap: A Journalistic View on Progress and Problems of GNSS.” __________ Before telling you what I came here to say today, I should really attempt to answer the question posed by our moderator:Is the world ready for new GNSS applications and services? If... read more

This article is tagged with and posted in All Blogs, Editor's Wide Awake Blog, GNSS

The Spy Who Loved Me

February 16, 2010By

With apologies to James Bond, Ian Fleming, and, well, just about everybody else. Here is a grab from my mail bag.  The message was subject-lined: GPS Spy Applications. “I recently suspected my wife of cheating, having been involved with gps as a land surveyor since 1995, I used and application called mobile-spy. “In order to install the application onto an... read more

This article is tagged with , and posted in All Blogs, Editor's Wide Awake Blog, GNSS, Personal Tracking

Integer ambiguity validation: Still an open problem?

July 30, 2007By

By Sandra Verhagen High-precision Global Navigation Satellite System (GNSS) positioning results are obtained with carrier phase measurements, once the integer cycle ambiguities have been successfully resolved. The position solution is obtained in four steps: 1. Float solution:least-squares, discarding integer nature. 2. Integer solution: real-valued float ambiguities mapped to integer-valued ambiguities.Examples of integer estimators (Teunissen, 1998a): • Integer Least-Squares: optimal, requires... read more

This article is tagged with , and posted in Algorithms & Methods, Tech Talk

Antenna-induced biases in GNSS receivers May 17, 2007

May 17, 2007By

By Inder Jeet Gupta It is well known that the phase center of a GNSS antenna can vary with the satellite direction. This phase center movement leads to aspect dependent carrier phase and code phase biases in the satellite signal. For precise geo-location, one needs to characterize the antenna-induced carrier and code phase biases over the upper hemisphere. In the... read more

This article is tagged with , and posted in OEM, Tech Talk