Abstract
Hybrid operation with two or more Global Navigation Satellite Systems (GNSS) together with (Multi-GNSS) is now popular in the enhanced Signal-in-Space (SiS) scenario that is expected to provide several advantages. The accuracy of solution using GNSS is affected by satellite geometry, quantitatively expressed in terms of Dilution of Precision (DOP) parameters. DOP values indicate the impact of the spatial distribution of the satellites on the final accuracy of the position solution. Evaluation of Position Dilution of Precision (PDOP) is important for the optimum selection of visible satellites of an individual or combined constellation to obtain good accuracy in 3-dimensioanl (3d) position fix. A proposed formulation, to evaluate PDOP in GPS-only environment with 4 satellites using the knowledge of elevation and azimuth of satellites, has been modified here to accommodate Multi-GNSS satellite availability without having any restriction on the number of satellites used for the calculation. Computed PDOP values using this algorithm match well with the data from the GNSS receivers that suggests the appropriate applicability of the algorithm for any constellation combination. Results on the optimum number of satellites for the best satellite geometry are also presented here that shows 23–25 GNSS satellites provide saturated PDOP values below 1, the addition of more satellites does not improve PDOP much.
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