Tag Archives: Understanding GPS

GPS Accurate to a Centimeter

How to find peace, love, and joy in the midst of the storms ahead in all that we do:

I have chosen to include God in all that I do, and that has made all the difference in my life.  I have learned that as we ask, seek, and knock (Matt. 7:7), God will put thoughts into our minds and inspire our doings.  I believe my master’s thesis, which gave birth to the Allan variance (AVAR), was inspired by God: Allan Variance – Spirit of Revelation | It’s About Time (itsabouttimebook.com).  Similar experiences have occurred over my professional career, and I give God the glory.  As an example, before I retired from the lab in Boulder, I was pondering on the problem of the inaccuracies in determining the positions of the GPS satellites; the vertical error component is the largest.  And the idea came into my mind that Kepler’s Third Law could solve this problem.  I asked my good friend, Professor Neil Ashby, to help me do the simulations.  We got some impressive results and presented a paper in the UK and later at an Institute of Navigation GPS conference in 2001 in Salt Lake City, UT: A New Paradigm for High Accuracy Orbit Determination at the Centimeter Level (allanstime.com).
Continue reading GPS Accurate to a Centimeter