By Jiadong Sun, Wenhai Jiao, Haitao Wu, Mingquan Lu
China satellite tv for pc Navigation convention (CSNC) 2014 complaints presents chosen examine papers from CSNC2014, hung on 21-23 may perhaps 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 procedure (GNSS) and the newest development made within the China BeiDou procedure (BDS) specifically. they're divided into nine themes to check the corresponding classes in CSNC2014, which widely coated key subject matters in GNSS. Readers can know about the BDS and continue 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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Extra info for China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume II
14 MHz respectively, Each band consist of data-component and pilot-component, we named it B2a_D, B2a_P, B2b_D and B2b_P, and the power ratio of four signals is 1:1:1:1, after tedious mathematical derivation one can obtain the power spectral density (PSD) expression of CBFH signals with 4fsc sampled subcarrier and 8fsc sampled subcarrier. GCBFH GCBFH 4ð f Þ ¼ 1 cos2 ðpfTc Þ½1 À cosðuÞ Á 2p2 f 2 Tc cos2 ðuÞ 2 pffiffi 3 u pffiffi 2 cos2 ðuÞ À 2 2 cosðuÞ cos 6 7 pffiffi 2u cos2 ðpfTc Þ4 pffiffi pffiffi 5 À 2 cosðuÞ þ 4 2 À 1 cos þ2 2À 2 2 8ð f Þ ¼ 2p2 f 2 Tc cos2 ðuÞ Here u ¼ pf =2fsc , fsc is subcarrier frequency, Tc is the width of PRN code.
Firstly, we considered the factor of g, that was the almanac frame having appropriate proportion of the total frame size: too bigger was not conducive to reduce the CED and GST acquisition time and too small gone against the average speed to obtain the almanac and ionosphere parameters, which were all undesirable for navigating; Secondly, the consistency of the ephemeris parameters during the active interval time should be considered; Finally, the CED and GST parameters should be designed in a independent subframe to avoid being separated by the parity bits, that was to be designed more 2 GNSS Message Structure Optimization 23 Fig.
For lower TTFF, the amount of essential data must be compendious, and if the total frame were 900, 450 bits needed for CED and GST in part A, and just 9 s with 50 bps data rate to first obtain positioning information, and then just 6 s with 75 bps. However, the reduction of the amount of data means that the accuracy of satellite orbit model would inevitably be reduced as well as the user positioning accuracy, which might lead to 5 m user range error (URE). The remaining CED, GST and almanac parameters were broadcasted in part B.