"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:8f9c6c14-2692-47e1-90d6-414ad5ea13b7","http://resolver.tudelft.nl/uuid:8f9c6c14-2692-47e1-90d6-414ad5ea13b7","Time Delay Estimation Based on Multi-band Multi-carrier Signal in Multipath Environments","Dun, 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)","","2019","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.","","en","conference paper","ION - Inst. of Navigation","","","","","Accepted Author Manuscript","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:971a17cd-8755-4438-875d-a78a83ce3717","http://resolver.tudelft.nl/uuid:971a17cd-8755-4438-875d-a78a83ce3717","Positioning based on OFDM signals through phase measurements","Dun, 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)","","2018","High 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.","","en","conference paper","IEEE","","","","","","","","","","Mathematical Geodesy and Positioning","","",""
"uuid:e7ab7e53-656f-4c51-90ed-02c73e4aee75","http://resolver.tudelft.nl/uuid:e7ab7e53-656f-4c51-90ed-02c73e4aee75","Mapping motorway lanes and real-time lane identification with single-frequency precise point positioning test","De Bakker, P.F.; Knoop, V.L.; Tiberius, C.C.J.M.; Van Arem, B.","","2014","Modern advanced motorway traffic control requires lane-specific observations, and provide vehicles with lane-specific control measures. Single-Frequency Precise Point Positioning (SF-PPP) was previously demonstrated to provide sub-meter accurate positions in real-time using a low-cost mass-market receiver and patch antenna. Next to an accurate current position of the vehicle, accurate maps of the lanes of the motorway are also needed to identify in which lane the vehicle is actually driving. Theoretical derivations indicate that the lanes of the motorway can in fact be mapped using the same SF-PPP results from a number of previous runs over the motorway. In this paper the proposed technique is tested in practice and a map of the lanes of a motorway is created. To this end, a vehicle equipped with a mass-market GPS device runs 100 times up and down a stretch of the A13 motorway between Delft and Rotterdam in the Netherlands (approximately 5.5 km each direction, in total for 100 runs about 17 hours of driving). A detailed assessment of the quality of the SF-PPP solution is presented in this paper. The errors in each of the horizontal directions are smaller than 1.1 meters in 95% of the epochs. The root-mean-square error (rmse) in these directions is in the order of 50 cm. A moderate bias in the cross track direction is observed, which could be a result of multipath from the vehicle itself (given the fact that the antenna is located asymmetrically on the roof, close to the right side of the vehicle). However, despite this bias, and given the fact that lanes on Dutch motorways are 3.5 meters wide, the availability of a SF-PPP lane identification system would be about 99% for this dataset.","","en","conference paper","Nederlands Instituut voor Navigatie","","","","","","","","Civil Engineering and Geosciences","Geoscience & Remote Sensing","","","",""
"uuid:62444c4e-650b-41b2-ac23-d9fc8a543a2b","http://resolver.tudelft.nl/uuid:62444c4e-650b-41b2-ac23-d9fc8a543a2b","A tool for GNSS integrity verification based on statistical extreme value theory","Veerman, H.; Van Kleef, A.; Wokke, F.; Ober, O.; Tiberius, C.C.J.M.; Verhagen, A.A.; Bos, A.; Mieremet, A.","","2012","The paper presents a short introduction to the mathematical theory of the EVT, the consecutive steps that are made in the software tool to address MI probability estimation and proof of range error distribution overbounding. Finally some early results obtained by GIMAT are presented.","","en","conference paper","Institute of Navigation","","","","","","","","Civil Engineering and Geosciences","Geoscience & Remote Sensing","","","",""