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Calibri 83ffff̙̙3f3fff3f3f33333f33333.FTU Delft RepositorygrV(uuidrepository linktitleauthorcontributorpublication yearabstract
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departmentresearch group programmeprojectcoordinates)uuid:8f9c6c14-2692-47e1-90d6-414ad5ea13b7Dhttp://resolver.tudelft.nl/uuid:8f9c6c14-2692-47e1-90d6-414ad5ea13b7XTime Delay Estimation Based on Multi-band Multi-carrier Signal in Multipath EnvironmentsDun, H. (TU Delft Mathematical Geodesy and Positioning); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Circuits and Systems); Diouf, C.E.V. (TU Delft Mathematical Geodesy and Positioning)The matched filter is the most common approach for time delay estimation and ranging in positioning systems. The accuracy is mainly determined by the signal bandwidth and multipath propagation condition. Instead of occupying an enormous signal bandwidth, aggregating multiple signal bands, which are transmitted either simultaneously or sequentially from the same transmitter, can still provide a very high time resolution due to its large virtual signal bandwidth. This paper discusses time delay estimation based on multiband signals, considering precision, range ambiguity and resistance to multipath. Combining carrier phases from different bands, which are physically not perturbed by a sampling frequency offset, can also mitigate the bias of time delay estimation due to the sampling frequency error. Simulation results show that using two groups of multiband signals, which are sparsely placed in the signal spectrum, can significantly improve the accuracy of time delay estimation in the presence of multipath and sampling frequency offset.enconference paperION - Inst. of NavigationAccepted Author Manuscript$Mathematical Geodesy and Positioning)uuid:971a17cd-8755-4438-875d-a78a83ce3717Dhttp://resolver.tudelft.nl/uuid:971a17cd-8755-4438-875d-a78a83ce3717<Positioning based on OFDM signals through phase measurementsDun, H. (TU Delft Mathematical Geodesy and Positioning); Tiberius, C.C.J.M. (TU Delft Mathematical Geodesy and Positioning); Janssen, G.J.M. (TU Delft Circuits and Systems)zHigh accuracy terrestrial radio positioning systems, as a complement to a global navigation satellite system (GNSS), are attracting significant attention from academia and industry. This article investigates the feasibility of positioning based on carrier phase measurements of orthogonal frequency division multiplexing (OFDM) signals. Generally, the carrier phase cannot be obtained from a baseband central carrier (i.e., direct current (DC) subcarrier) of OFDM signals, so we derived the carrier phase by calculating the average phase from two symmetrically located pilot sub-carriers. The sampling clock error and the timing synchronization error, which often occur in practice, can be cancelled by measuring the phase difference between two symmetrically located sub-carriers. The presented approach is simulated for a positioning system based on IEEE 802.11p Wireless LAN. Due to the presence of an initial carrier phase offset, the integer carrier phase ambiguity can, as expected, not be properly resolved. Although we can only obtain a 'float' solution from the observation model, the position accuracy can still achieve decimetre level.IEEE
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