Journal of Systems Engineering and Electronics 2010, 21(6) 1046-1053 DOI:   10.3969/j.issn.1004-4132.2010.06.018  ISSN: 1004-4132 CN: 11-3018/N

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Keywords
Hatch filter
adaptive
ionosphere delay
multipath
differential correction
local area augmentation system
Authors
PubMed

Novel adaptive Hatch filter to mitigate the effects of ionosphere and multipath on LAAS

Lin Zhao, Liang Li*, Ming Sun, and Xiaoxu Wang

College of Automation, Harbin Engineering University, Harbin 150001, P. R. China

Abstract��

It has been proven that carrier smoothing and differential global positioning system (DGPS) are effective to improve the accuracy of pseudorange by reducing the noise in it and eliminating almost all the common mode errors between the ground station and user. However, another issue coming with local area augmentation system (LAAS) is how to find an adaptive smoothing window width to minimize the error on account of ionosphere delay and multipath. Based on the errors analysis in carrier smoothing process, a novel algorithm is formulated to design adaptive Hatch filter whose smoothing window width flexibly varies with the characteristic of ionosphere delay and multipath in the differential carrier smoothing process. By conducting the simulation in LAAS and after compared with traditional Hatch filers, it reveals that not only the accuracy of differential correction, but also the accuracy and the robustness of positioning results are significantly improved by using the designed adaptive Hatch filter.

Keywords�� Hatch filter   adaptive   ionosphere delay   multipath   differential correction   local area augmentation system  
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DOI: 10.3969/j.issn.1004-4132.2010.06.018
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