Results 51 to 60 of about 387 (165)

BeiDou and Galileo, Two Global Satellite Navigation Systems in Final Phase of the Construction, Visibility and Geometry [PDF]

TransNav, 2016
Spatial segment is one of three segments of each satellite navigation systems (SNS). Nowadays two SNSs, GPS and GLONASS, are fully operational, two next SNSs, BeiDou in China and Galileo in Europe, are in final phase of the construction.
Jacek Januszewski
doaj   +1 more source

Positioning of Lightning Electromagnetic Radiation Sources With Satellite Constellations: Simulation and Preliminary Validation

Earth and Space Science, Volume 12, Issue 3, March 2025.
Abstract Satellites, equipped with electromagnetic sensors, can detect and locate the lightning electromagnetic radiation sources (LERS) in the thunderstorm over the globe surface of the Earth, delivering data regarding occurrence time, geolocation, and intensity. This paper presents the study on the three‐dimensional (3D) positioning of LERS utilizing
Xiao Li, Zongxiang Li, Xiaoqiang Li, Xiong Zhang, Yunfen Chang, Kai Zhang, Yongli Wei, Baofeng Cao, Peng Li   +8 more
wiley   +1 more source

A Fast Satellite Selection Algorithm Based on Hierarchical Clustering and Iterative Subset Optimization

Remote Sensing
When calculating positions, finding the optimal satellite subset is often a compromise between real-time performance and accuracy. This paper proposes a satellite selection method based on hierarchical clustering and iterative optimization.
Dan Jing, Weidie Li, Liang Han, Xinchen Li, Liangchao Li, Yan Zhang, Liang Guo, Mengdao Xing   +7 more
doaj   +1 more source

A Multilevel Optimised Algorithm for UWB Positioning in Indoor Environment

IET Communications, Volume 19, Issue 1, January/December 2025.
In ultra‐wideband indoor positioning systems, complex environmental factors such as multipath effects, occlusions, and non‐line‐of‐sight propagation often leads to decreased positioning accuracy and limited system robustness. To address this issue, this paper proposes a multilevel optimised estimation algorithm that integrates Particle Filtering with ...
Deshu Guo, Aihua Zhang, Haowen Xia
wiley   +1 more source

Implementation and Performance Analysis of RTK‐GNSS in Wearable Devices for Athletes in Harsh Environments

Electronics Letters, Volume 61, Issue 1, January/December 2025.
This study investigates the implementation of real‐time kinematic global navigation satellite system (RTK‐GNSS) technique in wearable electronic performance and tracking system for football players to obtain highly accurate positioning data, even in harsh environments.
Mingu Kim, Bit Kim, Chulwoo Park, Jinsung Yoon   +3 more
wiley   +1 more source

Optimal Ground‐Based Anchor Placements for Least‐Squares Multilateration

Electronics Letters, Volume 61, Issue 1, January/December 2025.
We investigate the optimal placement of ground‐based anchors for three‐dimensional multilateration using a least‐squares approach. By analysing the error variance under the equidistance assumption, we derive a target‐independent cost function and propose optimal placements for both norm‐constrained and boundary‐constrained scenarios.
Junsung Ko, Cheol‐Sun Park, Sun‐Phil Nah, WonZoo Chung   +3 more
wiley   +1 more source

Loran‐C Ground Wave Transmission Path Correction for High Elevation Based on the Huygens–Fresnel Principle

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
In this paper, based on the Huygens–Fresnel principle, we analyse the Loran‐C groundwave path and propose the groundwave path accumulation (GPA) algorithm, which calculates the groundwave transmission path in complex terrain in segments. It can improve the accuracy of Loran‐C users' packet positioning in high‐altitude areas significantly.
Ao Gao, Bing Ji, Guang Zheng, Miao Wu, Sisi Chang, Deying Yu, Wenkui Li   +6 more
wiley   +1 more source

A Deep Reinforcement Learning–Based Low Earth Orbit Satellite‐Enhanced Mobile Edge Computing Framework for Efficient Task Off‐Loading

IET Signal Processing, Volume 2025, Issue 1, 2025.
With the rapid advancement of the Internet of Things (IoTs) and 6G technologies, traditional terrestrial networks are becoming less capable of supporting demanding computational tasks. This limitation stems from their restricted coverage and poor adaptability to changing environmental conditions.
Erlong Wei, Yihong Wen, Xuebo Liu, Weiwei Jiang   +3 more
wiley   +1 more source

Research on Direction Cooperative Localization Model and Error Analysis for Manned–Unmanned Aircraft

International Journal of Aerospace Engineering, Volume 2025, Issue 1, 2025.
To achieve cooperative reconnaissance and localization of manned and unmanned aircraft, based on the traditional direction‐finding cross‐localization method, a direction cooperative localization model has been developed based on different baseline criteria. Compared with the traditional methods which require the reconnaissance platforms locating at the
Wenhuan Cao, Chao Chen, Wei Cui, Huixu Dong, Siming Zhang, Vijayanandh Raja   +5 more
wiley   +1 more source

Deghosting method for cross localization in distributed high frequency surface wave radar

The Journal of Engineering, Volume 2024, Issue 11, November 2024.
To address the ghosts emerging during the cross localization in a novel distributed high frequency surface wave system, a multi‐stage deghosting method is utilized, which is based on the geometric characteristics, the velocity features, and the motion features of the targets across multiple frames.
Na Cui, Xuekun Chen, Changjun Yu
wiley   +1 more source