Augmentation of DGNSS With Dynamic Constraints For Marine Navigation

S. Ryan and G. Lachapelle

Abstract:	Reliable and accurate GPS positions are required for general marine navigation and specialized applications such as buoy tending. The GPS signals are often masked by obstructions, which results in degraded geometry and accuracy at best, and unavailability or unreliable positions at worst. The use of combined GPS-GLONASS results in a dramatic increase in the number of satellites available above the horizon. When this combined constellation is further augmented with height and clock constraints, it results in an improvement in the reliability and precision of the navigation solutions. However, depending on the masking environment and the operational requirements, this augmented case may still not meet the user’s requirements. The reliability and precision of the navigation solution can be improved even further by adding ship dynamic constraints. The improvement attained by adding the ship dynamics constraint is illustrated through software simulations and hardware simulations using a GPS Signal Simulator. These results clearly demonstrate the advantage of augmenting GPS-GLONASS with ship dynamic constraints for marine navigation.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	1303 - 1314
Cite this article:	Ryan, S., Lachapelle, G., "Augmentation of DGNSS With Dynamic Constraints For Marine Navigation," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 1303-1314.
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