GNSS ambiguity resolution: Which subset to fix?

GNSS ambiguity resolution: Which subset to fix?

Verhagen, A.A.
Teunissen, P.J.G.
Van der Marel, H.
Li, B.

Civil Engineering and Geosciences

Geoscience & Remote Sensing

2011-11-15

A key issue with GNSS carrier phase ambiguity resolution is that often the full set of ambiguities cannot be fixed fast and reliably. A possible strategy is then to resolve only a subset of ambiguities, one for which the probability of correct fixing, the so-called success rate, is sufficiently close to 1. However, a proper subset selection criterion is still lacking. This criterion should on the one hand guarantee an acceptably high success rate, and at the same time result in a significant performance improvement with respect to the remaining parameters, like the baseline parameters. The second requirement is important and has not yet been addressed in literature. As an extreme example consider the case where the float ambiguities are not correlated with the other float parameters. Ambiguity resolution would then be useless, since it will then not allow for an improvement of these other parameters. This indicates that resolving a subset of ambiguities (in the extreme example, an empty subset) may lead to the same, or almost same, performance improvement of the other parameters, notably the baseline solution. This contribution presents two approaches to subset selection, where both the requirements on success rate and performance improvement are taken into account. With this approach the user can set a threshold for the success rate to be obtained. It will be shown how much better the baseline solution will be after reliable fixing of the subset of ambiguities.

partial ambiguity resolution
success rate
precision and reliability

http://resolver.tudelft.nl/uuid:075deb5b-5253-4daf-97be-f7126519612b

IGNSS Symposium 2011, International Global Navigation Satellite Systems Society, University of New South Wales, Sydney, Australia, 15-17 November 2011

Institutional Repository

conference paper

(c) 2011 The Author(s)