Correcting GPS Measurement Errors Induced by System Motion over Uneven Terrain


Conference Paper

Many cart- and vehicular-based UXO detection systems employ GPS receivers to accurately determine the system's position. However, the unevenness of the terrain often causes the system to tilt during the data collection, introducing errors in the GPS measurements. In this paper, two approaches are considered to correct the errors in the GPS measurements caused by the tilting of the system; low-pass filtering and adaptive filtering using a hidden Markov model (HMM). The low-pass filter smooths the data collection path recorded by the GPS receiver. Although this filter does not explicitly model the system motion, it does remove dramatic, and unrealistic, jumps in the GPS measurements. In contrast, the movement of the system can be explicitly modeled by an HMM. The HMM characterizes the cart motion so that the subsequent filtering is appropriate for the type of motion encountered. The error correction techniques are first applied to simulated data, in which both the sources of error and the ground truth are known so that the performance of the algorithms can be compared. The algorithms are then applied to measured data collected with a cart-based system to evaluate the robustness of their performance.

Full Text

Duke Authors

Cited Authors

  • Tantum, SL; Collins, LM; Khadr, N; Barrow, BJ

Published Date

  • November 26, 2003

Published In

Volume / Issue

  • 5089 / 2

Start / End Page

  • 1105 - 1115

International Standard Serial Number (ISSN)

  • 0277-786X

Digital Object Identifier (DOI)

  • 10.1117/12.487244

Citation Source

  • Scopus