Results 21 to 30 of about 1,168 (189)

HDOP and VDOP Analysis in an Ideal Placement Environment for Dual GNSSs

Sensors, 2022
Increasing the number of satellites in a global navigation satellite system (GNSS) improves the positioning accuracy and increases availability. However, it reduces the positioning accuracy improvement rate and increases the calculation loads, which can ...
JinHyeok Jang, Dana Park, Sangkyung Sung, Young Jae Lee   +3 more
doaj   +1 more source

Multi-Objective Design of a Lunar GNSS

Navigation, 2022
The success of future lunar missions depends on quality positioning, navigation, and timing (PNT) information. Earthbound GNSS signals can be received at lunar distances but suffer from poor geometric dilution of precision (GDOP) and provide no coverage ...
Filipe Pereira, Patrick M. Reed, Daniel Selva   +2 more
doaj   +1 more source

Application of the SBAS/EGNOS positioning method to determine UAV coordinates [PDF]

Przegląd Komunikacyjny, 2022
: The article presents the results of research on determining the UAV (Unmanned Aerial Vehicle) position using the SBAS (Satellite Based Augmentation System) positioning method for the EGNOS (European Geostationary Navigation Overlay Service) support ...
Henryk Jafernik, Kamil Krasuski, Janusz Ćwiklak, Damian Wierzbicki   +3 more
doaj   +1 more source

Weighted GDoP for improved position accuracy using NavIC and GPS hybrid constellation over Indian sub-continent

International Journal of Intelligent Networks, 2021
Positioning accuracy of any navigation system plays a vital role in precise positioning applications like CAT-1 aircraft landings, surveying, etc. GNSS positioning accuracy can be affected by many factors like multipath, refraction in atmospheric layers,
Ch. Rajasekhar, V.B.S. Srilatha Indira Dutt, G. Sasibhushana Rao   +2 more
doaj   +1 more source

TDOA positioning accuracy analysis based on time difference direction‐finding in distributed high‐frequency surface wave radar

IET Radar, Sonar &Navigation, Volume 17, Issue 10, Page 1498-1506, October 2023., 2023
Based on the time difference direction‐finding algorithm, new mathematical expressions of geometric dilution of precision (GDOP) are presented in Time Difference of Arrival positioning systems in this paper. The time difference direction‐finding reveals that the angle measurements are accurate for any length of baseline.
Yang Bai, Xin Zhang, Weibo Deng, Mengxiao Zhao   +3 more
wiley   +1 more source

Cooperative Navigation for Heterogeneous Air-Ground Vehicles Based on Interoperation Strategy

Remote Sensing, 2023
This paper focuses on the cooperative navigation of heterogeneous air-ground vehicle formations in a Global Navigation Satellite System (GNSS) challenged environment and proposes a cooperative navigation method based on motion estimation and a regionally
Chenfa Shi, Zhi Xiong, Mingxing Chen, Rong Wang, Jun Xiong   +4 more
doaj   +1 more source

VDES R‐Mode performance analysis and experimental results

International Journal of Satellite Communications and Networking, Volume 41, Issue 2, Page 158-177, March/April 2023., 2023
As maritime shipping relies almost exclusively on GNSS, there has been a demand for a backup system in case of a GNSS failure. We introduce and theoretically analyze the positioning performance of VDES R‐Mode as a candidate for an alternative maritime navigation system.
Markus Wirsing, Armin Dammann, Ronald Raulefs   +2 more
wiley   +1 more source

Subinertial Sea Surface Heights Anomalies Estimated Using High Frequency Radar Surface Current Data in the Mississippi Bight

Journal of Geophysical Research: Oceans, Volume 128, Issue 3, March 2023., 2023
Abstract Sea level studies in the Mississippi Bight (MSB) are less abundant than in other coastal waters of USA. This study investigates the subinertial (time scales >2 days) sea level anomalies in the MSB shelf. The diagnostics of the terms in the invariant form of the momentum equation were computed to determine which terms have the most influence on
Uchenna Nwankwo, Stephan Howden, Dmitri Nechaev, Brian Dzwonkowski   +3 more
wiley   +1 more source

Received Signal Strength‐Based Localization for Vehicle Distance Estimation in Vehicular Ad Hoc Networks (VANETs)

Journal of Sensors, Volume 2023, Issue 1, 2023., 2023
Vehicular ad hoc networks (VANETs) are an eminent area of intelligent transportation systems (ITS) which includes vehicle tracking, positioning, and emergency warnings. For protective applications, vehicle localization in the urban area is a significant problem.
Waqas Ahmad, Ghassan Husnain, Sheeraz Ahmed, Farhan Aadil, Sangsoon Lim, Huan Liu   +5 more
wiley   +1 more source

A Deep Learning Method for NLOS Error Mitigation in Coastal Scenes

Journal of Marine Science and Engineering, 2022
With the widespread use of automatic identification systems (AISs), some ships use deceptive information or intentionally close their AISs to conceal their illegal activities or evade the supervision of maritime departments.
Chao Sun, Meiting Xue, Nailiang Zhao, Yan Zeng, Junfeng Yuan, Jilin Zhang   +5 more
doaj   +1 more source