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Dual-Frequency GPS/GLONASS Real-Time Ambiguity Resolution for Medium-Range Kinematic Positioning
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dai, Liwen |
| Copyright Year | 2000 |
| Abstract | Precise GPS/GLONASS kinematic positioning to centimeter accuracy requires carrier phase ambiguities to be correctly resolved, and preferably in real-time. Because satellite orbit errors, and the residual atmosphere delay, especially due to the ionosphere, are distance dependent, ambiguity resolution over mediumrange distances (defined here as being of the order of 50-100km) becomes very difficult, and even impossible, if only GPS data is considered. On the other hand, because of the different signal frequencies for the GLONASS satellites, the standard double-differencing procedure used for carrier phase data processing cannot be implemented in its straightforward form as in the case of GPS. This paper describes the implementation, and presents results, of a dual-frequency GPS and GLONASS ambiguity resolution algorithm suitable for real-time application, for baseline lengths of several tens kilometers or more. The proposed procedure consists of three steps. The first step is widelane ambiguity determination using the double-differenced GPS and the single-differentied GLONASS pseudo-range data, and both doubledifferented widelane carrier phase combinations. The second step is to resolve the L1 (or L2) ambiguities using the ionosphere-free combination and the widelane fixed solution (with the resolved widelane ambiguities). The last step involves a quality control procedure that includes ambiguity validation, fault detection and automatic adaptation. The performance of this proposed algorithm is demonstrated through case study examples of kinematic positioning using static and kinematic data. The experiments show that the additional GLONASS observations can significantly improve the performance of single epoch positioning. The results indicate that the widelane ambiguities can be resolved instantaneously with 99.6% success rate, and the L1 and L2 ambiguities can be reliably fixed to their correct values after the widelane ambiguities have been resolved to their integer values. |
| Starting Page | 1071 |
| Ending Page | 1080 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.gmat.unsw.edu.au/snap/publications/dai_2000.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
