Results 11 to 20 of about 20,060,135 (189)

Evaluation of Inter-System Bias between BDS-2 and BDS-3 Satellites and Its Impact on Precise Point Positioning [PDF]

open access: yesRemote Sensing, 2020
The BeiDou navigation satellite system (BDS) currently has 41 satellites in orbits and will reach its full constellation following the launch of the last BDS satellite in June 2020 to provide navigation, positioning, and timing (PNT) services for global ...
Wen Zhao   +4 more
doaj   +5 more sources

Estimation of Inter-System Biases between BDS-3/GPS/Galileo and Its Application in RTK Positioning

open access: yesRemote Sensing, 2021
For the development of a global navigation satellite system (GNSS), the third generation of BeiDou Navigation Satellite System (BDS-3) achieved full constellation for worldwide service on 23 June 2020.
Wei Li, Song Zhu, Zutao Ming
doaj   +3 more sources

Real-Time Estimation of GPS-BDS Inter-System Biases: An Improved Particle Swarm Optimization Algorithm

open access: yesRemote Sensing, 2021
The restart of the receiver will lead to the change in the non-overlapping frequency inter-system biases (ISB), which will make it difficult to apply the tightly combined RTK method of pre-calibrating ISB to the actual scene. Particle swarm optimization (
Wenhao Zhao   +4 more
doaj   +3 more sources

Parameter-Dependent Agreement and Proportional Bias Between a Domestically Developed Scheimpflug-Based Imaging System and Pentacam HR [PDF]

open access: yesClinical Ophthalmology
Wei Cui,1– 3,* Kun Liu,1– 3,* Fanqin Kong,1– 3 Jie Wu1– 3 1Eye Institute of Shandong First Medical University, Qingdao Eye Hospital of Shandong First Medical University, Qingdao, People’s Republic of China; 2State Key Laboratory ...
Cui W, Liu K, Kong F, Wu J
doaj   +2 more sources

Agreement and Reliability of the G-Force System: Force Plate and Load Cell for the Isometric Mid-Thigh Pull in Physically Active Adults: A Repeated-Measures Method-Comparison Study [PDF]

open access: yesSensors
Objectives: We aimed to compare the agreement and reliability of the G-Force system (force plate and load cell) for the mid-thigh isometric pull test in physically active adults. Methods: Eighteen participants (age: 27.6 years; BMI: 27.8 kg/m2) performed
Héctor Fuentes-Barría   +9 more
doaj   +2 more sources

Evaluation of BDS-2 and BDS-3 Satellite Atomic Clock Products and Their Effects on Positioning

open access: yesRemote Sensing, 2021
The BeiDou Navigation Satellite System (BDS) has completed third phase construction and currently provides global services, with a mixed constellation of BDS-2 and BDS-3. The newly launched BDS-3 satellites are equipped with rubidium and passive hydrogen
Shengfeng Gu   +5 more
doaj   +1 more source

Investigation of Tightly Combined Single-Frequency and Single-Epoch Precise Positioning Using Multi-GNSS Data

open access: yesRemote Sensing, 2020
The loose combination (LC) and the tight combination (TC) are two different models in the combined processing of four global navigation satellite systems (GNSSs).
Chenlong Deng   +6 more
doaj   +1 more source

GNSS/RNSS Integrated PPP Time Transfer: Performance with Almost Fully Deployed Multiple Constellations and a Priori ISB Constraints Considering Satellite Clock Datums

open access: yesRemote Sensing, 2023
Currently, the space segment of all the five satellite systems capable of providing precise time transfer services, namely BDS (including BDS-3 and BDS-2), GPS, GLONASS, Galileo, and Quasi-Zenith Satellite System (QZSS), has almost been fully deployed ...
Gen Pei   +3 more
doaj   +1 more source

Assessment and Analysis of the Four-Satellite QZSS Precise Point Positioning and the Integrated Data Processing With GPS

open access: yesIEEE Access, 2021
The Quasi-Zenith Satellite System (QZSS), which serves Japan and its surrounding areas, is a regional navigation satellite system developed by Japan Aerospace Exploration Agency.
Xuanping Li, Lin Pan, Wenkun Yu
doaj   +1 more source

Inter-rater and intra-rater reliability of isotonic exercise monitoring device for measuring active knee extension [PDF]

open access: yesPeerJ, 2023
Background The goal of this study was to assess the reliability of electromyography and range of motion measurements obtained using a knee exercise monitoring system. This device was developed to collect data on knee exercise activities.
Chonnanid Limsakul   +4 more
doaj   +2 more sources

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