Results 21 to 30 of about 14,854 (254)

Long-Baseline Real-Time Kinematic Positioning: Utilizing Kalman Filtering and Partial Ambiguity Resolution with Dual-Frequency Signals from BDS, GPS, and Galileo

Aerospace
This study addresses the challenges associated with single-system long-baseline real-time kinematic (RTK) navigation, including limited positioning accuracy, inconsistent signal reception, and significant residual atmospheric errors following double ...
Deying Yu, Houpu Li, Zhiguo Wang, Shuguang Wu, Yi Liu, Kaizhong Ju, Chen Zhu   +6 more
doaj   +2 more sources

Precision analysis of partial ambiguity resolution-enabled PPP using multi-GNSS and multi-frequency signals

Advances in Space Research, 2020
A single-receiver integer ambiguity resolution-enabled precise point positioning (PPP-RTK) user experiences a long convergence time when the rather weak single-constellation dual-frequency ionosphere-float model is used.
Dimitrios Psychas, Sandra Verhagen, Peter J G Teunissen   +2 more
exaly   +2 more sources

The indexing ambiguity in serial femtosecond crystallography (SFX) resolved using an expectation maximization algorithm [PDF]

IUCrJ, 2014
Crystallographic auto-indexing algorithms provide crystal orientations and unit-cell parameters and assign Miller indices based on the geometric relations between the Bragg peaks observed in diffraction patterns.
Haiguang Liu, John C.H. Spence
doaj   +4 more sources

Improving Ambiguity Resolution for Medium Baselines Using Combined GPS and BDS Dual/Triple-Frequency Observations

Sensors, 2015
The regional constellation of the BeiDou navigation satellite system (BDS) has been providing continuous positioning, navigation and timing services since 27 December 2012, covering China and the surrounding area.
Wang Gao, Chengfa Gao, Shuguo Pan, Denghui Wang, Jiadong Deng   +4 more
doaj   +2 more sources

Partial Ambiguity Resolution for Ground and Space-Based Applications in a GPS+Galileo scenario: A simulation study

Advances in Space Research, 2015
Integer Ambiguity Resolution (IAR) is the key to fast and precise GNSS positioning. The proper diagnostic metric for successful IAR is provided by the ambiguity success rate being the probability of correct integer estimation.
Li, B., Teunissen, Peter, Nardo, A.
core   +3 more sources

A Partial Carrier Phase Integer Ambiguity Fixing Algorithm for Combinatorial Optimization between Network RTK Reference Stations

Sensors, 2021
In the face of a complex observation environment, the solution of the reference station of the ambiguity of network real-time kinematic (RTK) will be affected.
Shouhua Wang, Zhiqi You, Xiyan Sun
doaj   +1 more source

A Multi-Frequency Galileo PPP-RTK Convergence Analysis with an Emphasis on the Role of Frequency Spacing

Remote Sensing, 2021
The single-receiver integer ambiguity resolution-enabled variant of precise point positioning (PPP), namely PPP-RTK, has proven to be crucial in reducing the long convergence time of PPP solutions through the recovery of the integerness of the user ...
Dimitrios Psychas, Peter J. G. Teunissen, Sandra Verhagen   +2 more
doaj   +1 more source

Evaluation of Real-Time Kinematic Positioning and Deformation Monitoring Using Xiaomi Mi 8 Smartphone

Applied Sciences, 2022
Modern low-cost electronic devices can achieve high precision for global navigation satellite systems (GNSSs) and related applications. Recently, the pseudo-range and carrier phase have been directly obtained from a smartphone to establish a professional-
Shulin Zeng, Cuilin Kuang, Wenkun Yu
doaj   +1 more source

Quantifying neptunium oxidation states in nitric acid through spectroelectrochemistry and chemometrics

Frontiers in Nuclear Engineering, 2023
Controlled-potential in situ thin-layer spectropotentiometry was leveraged to generate visible/near-infrared (VIS/NIR) absorption spectral data sets for the development of chemometric models to quantify Np(III/IV/V/VI) oxidation states in HNO3.
Luke R. Sadergaski, Hunter B. Andrews, Sara E. Gilson, Adam J. Parkison   +3 more
doaj   +1 more source

Integrity Monitoring of PPP-RTK Positioning; Part I: GNSS-Based IM Procedure

Remote Sensing, 2021
Nowadays, integrity monitoring (IM) is required for diverse safety-related applications using intelligent transport systems (ITS). To ensure high availability for road transport users for in-lane positioning, a sub-meter horizontal protection level (HPL)
Kan Wang, Ahmed El-Mowafy, Weijin Qin, Xuhai Yang   +3 more
doaj   +1 more source