By Jiadong Sun, Wenhai Jiao, Haitao Wu, Mingquan Lu
China satellite tv for pc Navigation convention (CSNC) 2014 court cases presents chosen examine papers from CSNC2014, hung on 21-23 could in Nanjing, China. The subject matter of CSNC2014 is 'BDS software: Innovation, Integration and Sharing'. those papers speak about the applied sciences and functions of the worldwide Navigation satellite tv for pc method (GNSS) and the most recent development made within the China BeiDou method (BDS) specially. they're divided into nine subject matters to check the corresponding classes in CSNC2014, which greatly coated key themes in GNSS. Readers can know about the BDS and retain abreast of the newest advances in GNSS concepts and applications.
SUN Jiadong is the manager dressmaker of the Compass/ BDS and the Academician of chinese language Academy of Sciences (CAS); JIAO Wenhai is a researcher at China satellite tv for pc Navigation place of work; WU Haitao is a professor at Navigation Headquarters, CAS; LU Mingquan is a professor at division of digital Engineering of Tsinghua University.
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Extra resources for China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume II
The curve exhibited step at t = 0+, 12+24+, 36+ corresponds to the results of the above analysis and the rest were linear monotonically decreasing. Assuming that the reading point t was uniformly distributed on a full frame period (here, 48 s), we obtained the probability density function (PDF) by calculating the occurrence frequency of TCEDþGST within each section described as a 18 Y. Zhou et al. function where T indicated the value of xðtÞ that was the acquisition time of CED and GST parameters.
Comparative analysis shown that the Dual message structure had great reference value for lower TTFF. 7 Conclusion We emphatically discussed the relationship between message structure design and TTFF. The basic conclusions were following. Firstly, under the conditions that the maximum broadcast interval was 48 s and the GPS L2C CNAV was broadcasted by the way of data block, the acquisition time of CED and GST was about 64 s. 02 s that was the minimum time compared to other GPS and Galileo navigation message structure to obtain the CED and GST parameters at the same data rate and total amount, which was closely related to the almanac frame structure and the consistency of ephemeris parameters.
It was associated with CED and GST of CNAV2 being designed for two parts which one varied and the other one does not in the active interval of time. 4 Galileo Parameter Acquisition Time The relationship between message structure and TTFF of GPS NAV, Galileo F/NAV and I/NAV, Marco Anghileria proposed a detailed exposition and we only used the conclusion. To illustrate the impact of the message structure to TTFF, we normalized data rate to 50 bps to compare CED and GST acquisition time at 95 % confidence level.