Hybrid Schemes for Carrier Point Positioning Solution Quality Improvement

Faisal A. Khan, Andrew G. Dempster, and Chris Rizos

Peer Reviewed

Abstract: Operation of GNSS receivers in noise- and interference-dominated environments results in degraded positioning solution quality. Locata, operating on similar principles to GNSS, suffers from similar issues. This paper introduces the concept of a projected loop bandwidth, which offers similar improvements to the widely accepted adaptive bandwidth tracking loops but with reduced algorithm complexity. It is shown that the use of projected bandwidth along with appropriate measurement weighting offers the same advantages as adaptive bandwidth. Improvements offered by both adaptive and projected bandwidth loops are quantized and compared in terms of solution accuracy and precision. To achieve improvements at the navigation engine level, a new variance estimation method is proposed which outperforms CNIR-based variance estimation models used for measurement weighting. Implementation results are presented for the proposed schemes which show that solution accuracy and precision improvements of up to 36% and 35% can be achieved when compared to the conventional approach.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 57, Number 3
Pages: 231 - 247
Cite this article: Khan, Faisal A., Dempster, Andrew G., Rizos, Chris, "Hybrid Schemes for Carrier Point Positioning Solution Quality Improvement", NAVIGATION, Journal of The Institute of Navigation, Vol. 57, No. 3, Fall 2010, pp. 231-247.
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