Single-epoch Compass Carrier-phase Ambiguous Resolution Using Three Civil Frequencies and Special Constellations

J. Qu, H.Yuan, X. Zhang, G. Ouyang

Abstract:	Tremendous research efforts have been made towards carrier phase ambiguity resolution (AR) and position estimation using three or more GNSS signals over the past decade. With Compass/BeiDou-2 system, there are three frequency bands available, one of which is only used for Authorized Service. Many people overlook a problem. Compass system is the combination of Radio Navigation Satellite Service (RNSS) and Radio Determination Satellite Service (RDSS). RDSS provide a third civil frequency for Compass system, which allow Compass to choose three frequencies for high-precision navigation. But the third civil frequency only exist on the Geostationary Orbit (GEO) Satellites. And RDSS signal transmission is different from RNSS signals. There exit still some problems and limitations when these methods are used directly. A new technique for Compass carrier-phase single-epoch ambiguity resolution for short baseline is described in this paper. The Compass combined RDSS+RNSS differential carrier-phase positioning method is first proposed. Then a modified TCAR method on three Compass civil frequencies was used. Specifically, it uses a two-dimensional positioning method to achieve accurate AR for GEO satellites. Based on these, it then use the integer least-squares (ILS) search method in one-dimensional position domain to obtain an accurate AR for Non-GEO satellites. Test results show that, if baseline distance is less than 20km, the single epoch AR can be achieved with high success rate (>99.8%).
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	310 - 316
Cite this article:	Qu, J., H.Yuan,, Zhang, X., Ouyang, G., "Single-epoch Compass Carrier-phase Ambiguous Resolution Using Three Civil Frequencies and Special Constellations," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 310-316.
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