By Dabove, Paolo; Manzino, Ambrogio; De Agostino, Mattia
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Additional resources for Achievable positioning accuracies in a network of GNSS reference stations
See Fig. 14(b). 7. Conclusions This Chapter focused on high sensitivity signal acquisition problems. Throughout the chapter, some challenges to HS signal acquisition such as unknown data transitions, Doppler effects on carrier frequency and PRN code rate, local oscillator instability as well as sensitivity-complexity trade-off were discussed in details in order to deﬁne the requirements of HS acquisition strategies suitable for different operational scenarios. Then three HS acquisition approaches, namely stand-alone, external-aiding and channel combining, have been introduced.
E. (2001). Geolocation and assisted GPS, IEEE Computer 34(2): 123–125. Dodds, D. & Moher, M. (1995). Spread Spectrum Synchronization for a LEO Personal Communications Satellite System, Canadian Conference on Electrical and Computer Engineering 1995 (CCECE ’95), Montreal, PQ, Canada, pp. 20–23. , Boiero, G. & Ghinamo, G. (2010). A Test-bed Implementation of An Acquisition System for Indoor Positioning, GPS Solutions 14(3): 241–253. Elders-Boll, H. & Dettmar, U. (2004). Efﬁcient Differentially Coherent Code/Doppler Acquisition of Weak GPS Signals, Proceedings of the IEEE International Symposium on Spread Spectrum Techniques and Applications (ISSSTA 2004), Sydney, Australia, pp.
MN } being the data sequence provided by the assisted data. However, at the acquisition stage, the signal snap-shot and the assisted data are not synchronized. Therefore, in order to determine the correct bit sequence for the signal snap-shot, the acquisition stage needs to test all possible data sequence in a predetermined uncertainty. Then the maximum likelihood estimator is used for decision. e. 4D search-space). e. a data bit sequence candidate), the whole search-space must be re-computed. e.
Achievable positioning accuracies in a network of GNSS reference stations by Dabove, Paolo; Manzino, Ambrogio; De Agostino, Mattia