Results 71 to 80 of about 16,109,979 (360)

Projected speciality career choices amongst undergraduate dental students in Scotland [PDF]

, 2018
Background: Despite increased numbers of dental specialists, around 90% of dentists in the UK continue to work in general practice. Previous research shows that undergraduate students indicate interest in speciality careers, however few studies have ...
Lee, Yung, Ross, Alastair
core   +1 more source

Principle and performance of BDSBAS and PPP-B2b of BDS-3

Satellite Navigation, 2022
Within the framework of differential augmentation, this paper introduces the basic technical framework and performance of the BeiDou Global Navigation Satellite System (BDS-3) Satellite-Based Augmentation System (BDSBAS), including orbit products ...
Yuanxi Yang, Qun Ding, Weiguang Gao, Jinlong Li, Yangyin Xu, Bijiao Sun   +5 more
semanticscholar   +1 more source

Clustering Code Biases between BDS-2 and BDS-3 Satellites and Effects on Joint Solution

Remote Sensing, 2020
China’s BeiDou navigation satellite system (BDS) has finished global constellation construction and can achieve joint solution, simultaneously relying on the B1I + B3I signals of the BDS-2 and BDS-3 satellites.
Liang Chen, Min Li, Ying Zhao, Fu Zheng, Xuejun Zhang, Chuang Shi   +5 more
doaj   +1 more source

Protoplanetary Disk Masses from Stars to Brown Dwarfs [PDF]

, 2013
We present SCUBA-2 850um observations for 7 very low mass stars (VLMS) and brown dwarfs (BDs): 3 in Taurus, 4 in the TWA, and all classical T Tauri (cTT) analogs. We detect 2 of the 3 Taurus disks, but none of the TWA ones.
Apai, Daniel, Greaves, Jane, Lodato, Giuseppe, Looper, Dagny, Mohanty, Subhanjoy, Mortlock, Daniel, Pascucci, Ilaria, Scholz, Aleks, Thompson, Mark   +8 more
core   +2 more sources

Analysis of BDS-3 Onboard Clocks Based on GFZ Precise Clock Products

Remote Sensing, 2022
The characteristics and performance of satellite clocks are important to the positioning, navigation, and timing (PNT) services of Global Navigation Satellite System (GNSS) users.
Tao Geng, Rui Jiang, Yifei Lv, Xin Xie
doaj   +1 more source

Characterization and Performance Assessment of BeiDou-2 and BeiDou-3 Satellite Group Delays [PDF]

, 2022
Based on one year of data, a comprehensive assessment of broadcast group delays and differential code biases (DCBs) from network solutions is presented for all open BeiDou signals.
Hauschild, André, Montenbruck, Oliver, Steigenberger, Peter, Wang, Ningbo   +3 more
core   +1 more source

Dual-frequency to five-frequency real-time precise point positioning using new BDS-3 PPP-B2b service

Earth, Planets and Space
BeiDou global navigation satellite system (BDS-3), a developed GNSS by China, has the ability to support five different signals, including B1I, B3I, B1C, B2a, and B2b. Meanwhile, BDS-3 has officially provided the satellite-based precise point positioning
Haochen Yang, X. Ren, Mingxiu Liu, Xiaohong Zhang   +3 more
semanticscholar   +1 more source

High-Accuracy Clock Offsets Estimation Strategy of BDS-3 Using Multi-Source Observations

Remote Sensing, 2022
Satellite clock offsets are the critical parameters for The Global Navigation Satellite Systems (GNSSs) to provide position and timing (PNT) service. Unlike other GNSSs, BDS-3 uses the two-way superimposition strategy to measure satellite clock offsets ...
Jianhua Yang, Chengpan Tang, Sanshi Zhou, Yezhi Song, Jinhuo Liu, Yu Xiang, Yuchen Liu, Qiuning Tian, Yufei Yang, Zuo Yang, Xiaogong Hu   +10 more
doaj   +1 more source

Adapting empirical solar radiation pressure model for BDS-3 medium Earth orbit satellites

GPS Solutions, 2023
For the precise orbit determination (POD) of global navigation satellite systems (GNSS) constellation, it is very difficult to precisely model the solar radiation pressure (SRP) force acting on GNSS satellites.
Xinghan Chen, M. Ge, Yang Liu, Lina He, H. Schuh   +4 more
semanticscholar   +1 more source

Performance Assessment of BDS-2/BDS-3/GPS/Galileo Attitude Determination Based on the Single-Differenced Model with Common-Clock Receivers

Remote Sensing, 2021
Global navigation satellite system (GNSS)-based attitude determination has been widely applied in a variety of fields due to its high precision, no error accumulation, low power consumption, and low cost. Recently, the emergence of common-clock receivers
Mingkui Wu, Shuai Luo, Wang Wang, Wanke Liu   +3 more
doaj   +1 more source