Nominal Deformations Analysis of BDS Navigation Signal
KANG Li1,2,3, WANG Xue1,2,3, XIONG Ding-xi4, RAO Yong-nan1,2, LU Xiao-chun1,2,3, HE Cheng-yan1,2
1. National Time Service Center, Chinese Academy of Sciences, Xi'an, Shaanxi 710600, China;
2. Key laboratory of Precision Navigation, Positioning and Timing, National Time Service Center, Chinese Academy of Sciences, Xi'an, Shaanxi 710600, China;
3. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, China;
4. Beijing Tracking and Communication Technology Institution, Beijing 100094, China
Abstract：Beidou satellite navigation system (BDS) contains subtle nominal deformations.The traditional research focuses on deformation of single satellite and cannot quantitatively calculate the ranging biases due to nominal deformations.This paper analyzes BDS B1I signal nominal deformations based on time waveform,channel characteristics and ranging biases.The data are from big antenna receiving system combined with software receivers.Firstly,the cumulative averaging method and standard chip correlation technique are used to extract the details of signal deformations,and the digital distortion value of each satellite is calculated.Then,channel characteristics of all satellite signals are analyzed based on least square method.Lastly B1I signal natural ranging biases and the maximum ranging biases are analyzed quantitatively by S-curve bias.The nominal deformations of B1I signal are comparatively studied from multiple dimensions and the results presented could provide a new thought for signal-in-space assessment and receiver design.
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2018, Vol. 46 
