ON ESTIMATING MAP MODEL ERRORS AND GPS POSITION ERRORS: APPLYING MORE SCIENCE TO THE ART OF NAVIGATION

Peter Kielland and Tony Tubman

Peer Reviewed

Abstract: To decide whether a desired maneuver can or cannot be undertaken safely, a prudent navigator must be aware of both the current spatial uncertainty of the vehicle’s positioning system and the spatial uncertainty of the navigational map model being used to depict the theater of operations. This paper discusses the electronic chart (EC) implications of both GPS vessel positioning errors and the relatively large data modeling errors specific to bathymetric map models (charts). It proposes and demonstrates software solutions that statistically evaluate both of these spatial uncertainties and graphically integrates the two stochastic models within an EC environment. The depicted estimates of bathymetric map model errors were computed using a modified kriging algorithm that interpolates both a g-ridded seafloor model and a stochastic surface that describes the fidelity of this model. This algorithm is being developed as part of an international effort to define quality standards for digital bathymetric data. The paper also describes how GPS real-time position error estimates were validated experimentally, and how enhancements to the estimation algorithm were devised.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 41, Number 4
Pages: 479 - 500
Cite this article: Kielland, Peter, Tubman, Tony, "ON ESTIMATING MAP MODEL ERRORS AND GPS POSITION ERRORS: APPLYING MORE SCIENCE TO THE ART OF NAVIGATION", NAVIGATION, Journal of The Institute of Navigation, Vol. 41, No. 4, Winter 1994-1995, pp. 479-500.
Full Paper: ION Members/Non-Members: 1 Download Credit
Sign In