Results 61 to 70 of about 1,004 (162)

PPP-based UAV modeling using Galileo HAS orbit/clock products and RTS smoother

Geodesy and Geodynamics
Unmanned aerial vehicle (UAV) remote sensing and mapping using real-time kinematic (RTK) require reference-station corrections and suffer from accuracy degradation over long baselines.
Jia Song, Peng Li, Lewen Zhao, Yuanjin Pan, Meilin He   +4 more
doaj   +1 more source

Characterizing North‐South Ionospheric Gradients During Geomagnetic Storms: A Variogram Enhancement for Wide Area Ionospheric Models

Space Weather, Volume 24, Issue 1, January 2026.
Abstract The intensified solar maximum of Cycle 25 has heightened space weather risks to Global Navigation Satellite Systems (GNSS), where geomagnetic storms critically challenge Positioning, Navigation, and Timing (PNT) availability. Current wide‐area ionospheric models may fail to resolve extreme latitudinal Total Electron Content (TEC) gradients ...
Tong Liu, Yiping Jiang, Bo Chen, Jian Liu, Yufang He, Wu Chen   +5 more
wiley   +1 more source

Robust Kalman Filter Aided GEO/IGSO/GPS Raw-PPP/INS Tight Integration

Sensors, 2019
Reliable and continuous navigation solutions are essential for high-accuracy location-based services. Currently, the real-time kinematic (RTK) based Global Positioning System (GPS) is widely utilized to satisfy such requirements.
Zhouzheng Gao, You Li, Yuan Zhuang, Honglei Yang, Yuanjin Pan, Hongping Zhang   +5 more
doaj   +1 more source

Regional Medium‐Scale Traveling Ionospheric Disturbance Propagation Model Based on BDS GEO Satellites

Space Weather, Volume 24, Issue 1, January 2026.
Abstract Accurate modeling of traveling ionospheric disturbances (TIDs) is essential for characterizing their spatiotemporal variations and mitigating their effects on Global Navigation Satellite System (GNSS) precise positioning. This study develops a regional medium‐scale TID (MSTID) propagation model using BeiDou geostationary orbit (GEO) total ...
Dengkui Mei, Xiaohong Zhang, Xiaodong Ren, Xuan Le, Wentao Yang, Ahmed Abdelaziz   +5 more
wiley   +1 more source

Abstracts

Molecular Oncology, Volume 20, Issue S1, Page 1-692, August 2026.
Abstracts submitted to the ‘EACR 2026 Congress: Innovative Cancer Science’, from 08–11 June 2026 and accepted by the Congress Organising Committee are published in this Supplement of Molecular Oncology, an affiliated journal of the European Association for Cancer Research (EACR).
wiley   +1 more source

A Study of Standalone GNSS Positioning Precision in Covered Agricultural Environments: ETFE Polytunnels Versus Glass Greenhouses

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
The paper presents an experimental study of the standalone positioning performance of a high‐end survey grade and a mass‐market dual‐frequency GNSS receiver in covered agricultural environments (CAEs) comparing an ETFE polytunnel and a Cambridge‐style glass greenhouse against an open‐field baseline.
Alex Schofield, Jasmine Zidan, Raphael Grech, Esther Anyaegbu, Emilio Loo‐Monardez, Paul A. Jennings, Matthew D. Higgins   +6 more
wiley   +1 more source

Accuracy Assessment of RTK, PPK, and PPP-AR Techniques for Direct Georeferencing in UAV-Based Photogrammetric Mapping [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
In the fields of mapping, surveying, and three-dimensional (3D) modeling, unmanned aerial vehicle (UAV) systems have become essential equipment in recent times. UAVs are increasingly widely used, especially in the field of photogrammetry. The integration
M. Arkalı, M. E. Atik
doaj   +1 more source

High-precision services of BeiDou navigation satellite system (BDS): current state, achievements, and future directions

Satellite Navigation
With the rapid development of technologies such as autonomous driving and robotic navigation, the demand for accurate and reliable positioning results with BDS has increased.
Weiguang GAO, Wei Zhou, Chengpan Tang, Xingxing Li, Yongqiang Yuan, Xiaogong Hu   +5 more
doaj   +1 more source

A Unified Model for BDS Wide Area and Local Area Augmentation Positioning Based on Raw Observations

Sensors, 2017
In this study, a unified model for BeiDou Navigation Satellite System (BDS) wide area and local area augmentation positioning based on raw observations has been proposed.
Rui Tu, Rui Zhang, Cuixian Lu, Pengfei Zhang, Jinhai Liu, Xiaochun Lu   +5 more
doaj   +1 more source

Enhancing PPP-RTK resilience: a comprehensive evaluation of atmospheric product extrapolation methods for handling transmission interruptions

Geo-spatial Information Science
Precise Point Positioning Real-Time Kinematic (PPP-RTK) represents a groundbreaking advancement in Global Navigation Satellite System (GNSS) positioning technology, enabling rapid centimeter-level accuracy without dependence on proximate reference ...
Hua Chen, Linyu He, Xingyu Zhou, Zhiyuan An, Zilu Cui, Qingyun Tang, Jiaoling Qin, Weiping Jiang   +7 more
doaj   +1 more source