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Slawomir Cellmer
Approximation of ambiguity covariance matrix for integer
de-correlation procedure in single-epoch GNSS positioning
| Conference Information: |
9th International Conference “Environmental Engineering”, 22–23 May 2014, Vilnius, LITHUANIA |
| Source: |
ICEE-2014 - International Conference on Environmental
Engineering |
| Book Series: |
International Conference on Environmental Engineering
(ICEE) Selected papers |
| ISSN: |
eISSN 2029-7092 online |
| ISBN: |
eISBN 978-609-457-640-9 |
| ISBN: |
ISBN 978-609-457-690-4 CD |
| Year: |
2014 |
| Publisher: |
Vilnius Gediminas Technical University Press Technika |
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Abstract
An ambiguity resolution plays the key role in GNSS carrier phase processing.
Recently the LAMBDA method is widely used for this purpose. The algorithm of this
method contains integer de-correlation procedure. An ambiguity covariance matrix
is input data in this procedure. This matrix should to be positive definite.
In traditional approach the observation data has to be complemented with additional
group of code observations. It is necessary to obtain 'positive definiteness'
in the case of single-epoch positioning. In the article new formula for approximation of positive
definite ambiguity covariance matrix is presented. This formula does not require code observations.
The numerical tests were carried out in order to show the efficiency of proposed solution.
The results of these tests are presented.
Keywords: GNSS data processing; single-epoch positioning; ambiguity resolution.
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