Results 201 to 210 of about 166,231 (222)

Doppler shift estimation using broadcast ephemeris in satellite optical communication

2016 25th Wireless and Optical Communication Conference (WOCC), 2016
There is severe Doppler shift in satellite optical communication, which greatly affects the coherent demodulation and should be eliminated. This paper is a preliminary study of the optical phase-locked loop, using the broadcast ephemeris to estimate the Doppler shift and pulling it down into a range in which it can be captured by digital processing.
Yunxiang Xu, Bin Wu
openaire   +2 more sources

Autonomous broadcast ephemeris improvement for GNSS using inter-satellite ranging measurements

Advances in Space Research, 2012
Abstract This paper discusses the concept of using inter-satellite ranging (ISR) measurements of the satellites of a Global Navigation Satellite System (GNSS) for autonomous broadcast ephemeris improvement. Firstly the inter-satellite ranging is modeled to obtain the clock and orbit error observables.
Hongliang Xu, Jinling Wang, Xingqun Zhan
openaire   +2 more sources

Frequency stability estimation of Compass On-board clock based on smoothed broadcast ephemeris

2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC), 2013
For Compass and Galileo systems which are currently in their stage of construction, it is difficult to obtain precise on-board clock short-term stability for common users. In this paper, a simple estimation method based on smoothed broadcast ephemerides is proposed, which only needs observation from one single receiver.
Wang Feixue, Xiangwei Zhu, Hai Sha, Hang Gong, Wenke Yang   +4 more
openaire   +2 more sources

Precision Analysis of CNAV Broadcast Ephemeris and Its Impact on the User Positioning

2017
GPS broadcast ephemeris error is an important factor affecting the real-time positioning accuracy. Since April 2014, the IGS provided two new broadcast ephemeris products, namely LNAV (Legacy Navigation Message) and CNAV (Civil Navigation Message). Compared with LNAV, CNAV was broadcasted only on Block IIR-M and IIF satellites.
Junping Chen, Ahao Wang, Jiexian Wang
openaire   +2 more sources

Improved method for BDS-3 satellite clock parameterization in the broadcast ephemeris, real-time service (RTS) and IGS final products

Measurement, 2022
Haojun Li, Huimin Ding, Baoxin Feng, Qi Kang   +3 more
semanticscholar   +1 more source

Assessment of BDS-3 terrestrial reference frame realized by broadcast ephemeris: comparison with GPS/Galileo

GPS Solutions, 2021
Guo Chen, N. Wei, Min Li, Qile Zhao, Yujiao Niu, Hongliang Cai, Yinan Meng   +6 more
semanticscholar   +1 more source

Evaluation of GPS and BDS-3 broadcast earth rotation parameters: a contribution to the ephemeris rotation error

GPS Solutions, 2023
Wenwen Li, Guo Chen, Min Li, N. Wei, Yubin Wang, Qile Zhao   +5 more
semanticscholar   +1 more source

A Novel Method to Provide URE in Broadcast or Extended Ephemeris

ION Pacific PNT, 2017
Yang Gao, Wentao Zhang
openaire   +1 more source

Multi-GNSS broadcast ephemeris errors assessment and weight determination of different constellations for SPP

Advances in Space Research
Hang Shen, Ran Li, Shuhui Li, Jingbin Liu, Xiao Chen, Jiajia Xu   +5 more
semanticscholar   +1 more source

Comprehensive outage compensation of real-time orbit and clock corrections with broadcast ephemeris for ambiguity-fixed precise point positioning

, 2021
Qing Zhao, Wang Gao, Chengfa Gao, S. Pan, Xing Yang, Jun Wang   +5 more
semanticscholar   +1 more source