Results 71 to 80 of about 2,505 (209)

Kinematic Absolute Positioning with Quad-Constellation GNSS [PDF]

, 2019
The absolute positioning technique is based on a point positioning mode with a single Global Navigation Satellite System (GNSS) receiver, which has been widely used in many fields such as vehicle navigation and kinematic surveying.
Cai, Changsheng, Cui, Xianqiang, Pan, Lin, Zhu, Jianjun   +3 more
core   +2 more sources

Precise Orbit and Clock Products of Galileo, BDS and QZSS from MGEX Since 2018: Comparison and PPP Validation [PDF]

, 2020
In recent years, the development of new constellations including Galileo, BeiDou Navigation Satellite System (BDS) and Quasi-Zenith Satellite System (QZSS) have undergone dramatic changes. Since January 2018, about 30 satellites of the new constellations
Li, Xingxing, Liu, Gege, Xiong, Yun, Yuan, Yongqiang, Zheng, Kai, Zhu, Yiting   +5 more
core   +1 more source

A Robust Stochastic Modelling Approach for Tight Integration of Precise Point Positioning and Ultra‐Wide Band

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
(1) A robust stochastic modelling approach is proposed for PPP/UWB tightly coupled integration using optimised variance component estimation. (2) In our proposed approach, the VCE‐based stochastic model is optimised with a robust estimation strategy and an adaptive moving window filter technique.
Tonghui Shen, Changsheng Cai, Wenping Jin   +2 more
wiley   +1 more source

Characteristics of Onefold Clocks of GPS, Galileo, BeiDou and GLONASS Systems

Sensors, 2021
This research is focused on searching for frequency and noise characteristics for available GNSS (Global Navigation Satellite Systems). The authors illustrated frequency stability and noise characteristics for a selected set of data from four different ...
Qingsong Ai, Kamil Maciuk, Paulina Lewinska, Lukasz Borowski   +3 more
doaj   +1 more source

A priori knowledge-free fast positioning approach for BeiDou receivers

, 2022
A Global Navigation Satellite System (GNSS) receiver usually needs a sufficient number of full pseudorange measurements to obtain a position solution. However, it is time-consuming to acquire full pseudorange information from only the satellite broadcast
Cui, Xiaowei, Lu, Mingquan, Zhao, Sihao
core   +1 more source

Low Profile and Multiband Antenna Based on Binary Encoding and Multiobjective Optimization With Artificial Intelligence

International Journal of Antennas and Propagation, Volume 2025, Issue 1, 2025.
This paper presents a low profile and multiband antenna based on binary encoding and multiobjective optimization using artificial intelligence (AI). The antenna adopts a single‐arm helical structure on the top layer and two metal parasitic middle layers above the ground. The parasitic layers are composed of 10 × 10 rectangular squares, being similar as
Wenbo Geng, Guolin Tong, Ayan Chatterjee
wiley   +1 more source

Doppler effects in UAV‐to‐vehicle multipath channels under 6D mobility

IET Microwaves, Antennas &Propagation, Volume 18, Issue 12, Page 1042-1054, December 2024.
In this paper, a geometry‐based stochastic model framework for U2V communication is studied, with consideration of the movement of a UAV in both three‐dimensional (3D) translational and 3D rotational directions, as well as a ground vehicle capable of moving in arbitrary directions with varying velocities. The Doppler shift expressions for various paths
Junwei Bao, Zhuangzhuang Cui, Yang Miao, Qiuming Zhu, Kai Mao, Boyu Hua   +5 more
wiley   +1 more source

Positioning buried utilities in difficult environments [PDF]

, 2016
Recently an increasing number of underground pipes have been established, particularly in city centres, for different applications such as sewage, electricity, gas, water and drainage.
de Ligt, Huib, Hancock, Craig, Lau, Lawrence, Quan, Yiming, Roberts, Gethin Wyn, Zhang, Penghe   +5 more
core  

Midlatitude Plasma Blob‐like Structures Along With Super Equatorial Plasma Bubbles During the May 2024 Great Geomagnetic Storm

Geophysical Research Letters, Volume 51, Issue 21, 16 November 2024.
Abstract Plasma blob is generally a low‐latitude phenomenon occurring at the poleward edge of equatorial plasma bubble (EPB) during post‐sunset periods. Here we report a case of midlatitude ionospheric plasma blob‐like structures occurring along with super EPBs over East Asia around sunrise during the May 2024 great geomagnetic storm.
Wenjie Sun, Guozhu Li, Biqiang Zhao, Shun‐Rong Zhang, Yuichi Otsuka, Lianhuan Hu, Guofeng Dai, Xiukuan Zhao, Haiyong Xie, Yi Li, Jianfei Liu, Yu Li, Baiqi Ning, Libo Liu, Atsuki Shinbori, Michi Nishioka, Septi Perwitasari   +16 more
wiley   +1 more source

Advanced receiver autonomous integrity monitoring using triple frequency data with a focus on treatment of biases [PDF]

, 2016
Most current Advanced Receiver Autonomous Integrity Monitoring (ARAIM) methods are designed to use dual-frequency ionosphere-free observations. These methods assume that receiver bias is absorbed in the common receiver clock offset and bound satellite ...
El-Mowafy, Ahmed
core   +1 more source