caa a22 4500 606162208 CHVBK 20210128100638.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10291-014-0365-9 doi (NATIONALLICENCE)springer-10.1007/s10291-014-0365-9 Dichotomous search of coarse time error in collective detection for GPS signal acquisition [Elektronische Daten] [Joon Cheong, Jinghui Wu, Andrew Dempster] Coarse time error (CTE) is an additional systematic absolute-timing-related bias that must be compensated in an assisted GPS (A-GPS)-based snapshot receiver where the complex baseband signal available for processing is finite and short. Resolving for CTE instead of waiting for the time of week string in the satellite's navigation message allows A-GPS receivers to achieve faster time to first fix in cold start and warm start conditions. This paper highlights the problem of CTE that is conventionally resolved using coarse time positioning (CTP)—a least-squares-based algorithm. Following this, the same problem is shown to occur when collective detection (CD)—a direct position estimation algorithm—is applied in place of CTP. Previous literature on CD has not discussed nor presented any resolution to the CTE problem. Directly augmenting CTE to be resolved together with the user's position and common clock bias in CD requires huge computational resources, which is impractical to be implemented using current generation consumer-grade computers. Therefore, the main contribution of this research is to propose and implement a dichotomous search jointly with CD to resolve for the CTE and position-common-clock-bias vector, respectively, at a relatively low computational burden. Empirical results using live satellite signals show that the proposed method is capable of effectively eliminating the positioning error biases caused by CTE. It is shown that the proposed compensation method can achieve equivalent performance to the conventional CTP method without losing the benefits of CD. Springer-Verlag Berlin Heidelberg, 2014 Collective detection nationallicence GPS signal acquisition nationallicence Coarse time error nationallicence Coarse time positioning nationallicence Dichotomous search nationallicence Assisted GPS nationallicence Cheong Joon School of Surveying and Geospatial Engineering, University of New South Wales, Sydney, Australia aut Wu Jinghui School of Surveying and Geospatial Engineering, University of New South Wales, Sydney, Australia aut Dempster Andrew School of Surveying and Geospatial Engineering, University of New South Wales, Sydney, Australia aut GPS Solutions Springer Berlin Heidelberg 19/1(2015-01-01), 61-72 1080-5370 19:1<61 2015 19 10291 https://doi.org/10.1007/s10291-014-0365-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10291-014-0365-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cheong Joon School of Surveying and Geospatial Engineering, University of New South Wales, Sydney, Australia aut NATIONALLICENCE 700 1- Wu Jinghui School of Surveying and Geospatial Engineering, University of New South Wales, Sydney, Australia aut NATIONALLICENCE 700 1- Dempster Andrew School of Surveying and Geospatial Engineering, University of New South Wales, Sydney, Australia aut NATIONALLICENCE 773 0- GPS Solutions Springer Berlin Heidelberg 19/1(2015-01-01), 61-72 1080-5370 19:1<61 2015 19 10291