Application of the Recursive Signal Processing of the Floating Solution in Multipath Environment

S-L. Cho, C. Park, S-J. Lee

Abstract:	In general, a roving user experiences a limitation in the performance of a floating solution because it carried out independent signal processing of a single epoch measurement value for every epoch. The existing carrier-phase differential GPS (CDGPS) using multi-epoch measurements is capable of achieving good floating solution performance because it employs a batch signal processing technique aimed at precise positioning at a fixed location. However, because it uses the measurement values in all epochs, it has the drawback of an exponential increase in the computational cost. In this paper, we apply a recursive signal processing technique for improving the performance of an initial floating solution for the roving users of the CDGPS. The applied signal processing technique estimates a floating solution at the current time using a position determined by the measurements at the previous times and the measurement at the current time. The applied signal processing technique incurs a computational cost comparable to that of the epoch-by-epoch signal processing technique and demonstrates the same floating solution performance as the batch signal processing technique, as proven in tests using actual signals in multipath environment. Users at a fixed position use multi-epoch measurements to determine the accurate initial position and integer ambiguities. The batch signal processing technique using the existing multi-epoch-based batch signal processing technique has the drawback of an exponentially increasing computational cost as the number of multi-epoch measurements increase. This makes it inappropriate for roving users, and therefore, it has been mostly used for post-processing precise positioning. The recursive signal processing technique proposed in this paper improved floating solution precision and reduced computational cost as compared to the existing epoch-by-epoch and batch signal processing techniques by effectively employing multi-epoch measurements. The performance analysis results revealed that the applied technique had a performance level comparable with the batch signal processing technique and exhibited a computational time similar to that of the existing epoch-by-epoch signal processing technique despite the increased multi-epoch measurements in multipath environment.
Published in:	Proceedings of the 2014 International Technical Meeting of The Institute of Navigation January 27 - 29, 2014 Catamaran Resort Hotel San Diego, California
Pages:	181 - 185
Cite this article:	Cho, S-L., Park, C., Lee, S-J., "Application of the Recursive Signal Processing of the Floating Solution in Multipath Environment," Proceedings of the 2014 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2014, pp. 181-185.
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