By Jiadong Sun, Wenhai Jiao, Haitao Wu, Mingquan Lu
China satellite tv for pc Navigation convention (CSNC) 2014 court cases presents chosen study papers from CSNC2014, hung on 21-23 could in Nanjing, China. The subject matter of CSNC2014 is 'BDS program: Innovation, Integration and Sharing'. those papers talk 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) specifically. they're divided into nine issues to compare the corresponding periods in CSNC2014, which widely coated key subject matters in GNSS. Readers can find out about the BDS and preserve abreast of the newest advances in GNSS innovations and applications.
SUN Jiadong is the executive 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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Additional info for China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume II
36 %. 4 Simulation Results In this section, our proposed modulation signal is analyzed by simulation and compared with ACED. 023 MHz. Four PRN codes exploit Galileo E5 signal’s primary codes, no secondary codes are considered, so code length is 10,230, and code period is 1 ms. 3 is the signal’s constellation diagram when four signals’ power ratio is 1:1:3:3. 3a is the case of DEAl-BOC, and Fig. 3b is ACED. From the view of time domain, in order to generate this signal, the required control-clock frequency for DEAl-BOC is 8 times of subcarrier frequency, but there are 32 possible phases in Fig.
Namely p2 = p1 = 1, p3 = p4 = c. Then the total power ratio is 1:1:c2:c2. We get several optimal numerical solutions for different total power ratios. 11). 1a shows the combination efficiency of optimal solution and analytical solution versus power ratio c2. It illustrates that the difference of power between lower sideband and upper sideband is greater; the maximal combination efficiency is higher. In addition, we can find that the difference of combining efficiency between analytical solution and numerical optimal solution is less than 1 %.
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. 8 bps. Finally, we presented the key factor of navigation message structure designing to reduce the TTFF which was mainly about the following three points: (1) the almanac frame proportion of the total frame size should be appropriate; (2) the ephemeris parameters should be consistent during the effective interval; (3) the message parameters should be more compact.