Results 71 to 80 of about 843 (194)

Positioning Accuracy Model of Sailing‐Circle GPS‐Acoustic Method

Earth and Space Science, 2021
Sailing‐circle GPS‐acoustic method, prevalently applied for measuring ocean floor crustal deformation, allows the precise positioning of an underwater transponder in a global frame.
Xinhua Chen, Hongmei Zhang, Jianhu Zhao, Wenbiao Liang, Jie Feng   +4 more
doaj   +1 more source

Multistatic Synthetic Aperture Radar Autofocus for Back Projection Imaging of a Moving Target

Electronics Letters, Volume 61, Issue 1, January/December 2025.
This paper presents a new metric‐based autofocus approach, called Localised Threshold Sharpness (LTS), which employs Multistatic SAR data to localise and focus a target moving with up to six degrees of freedom motion on a real‐time, pulse‐by‐pulse basis.
Anmol Rattan, Daniel Andre, Mark Finnis
wiley   +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

Study on the Influence of Space–Time Adaptive Processor on Single Point Position and Real‐Time Kinematic for GNSS Antenna Array Anti‐jamming Receiver

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
This paper studies the influences of STAP algorithms on SPP and RTK systematically. Simulation and experiment results show that the STAP algorithms will deteriorate the performances of SPP and RTK. Results of this paper will provide reference for evaluating the performance of the GNSS antenna array anti‐jamming receiver.
Yaoding Wang, Xiaozhou Ye, Si Chen, Zhenxin Liu   +3 more
wiley   +1 more source

Multi‐Objective Optimization of Cislunar Navigation Constellations and Mission Validation for Lunar Re‐Exploration

Advances in Astronomy, Volume 2025, Issue 1, 2025.
To address the limitations of traditional navigation systems in lunar exploration missions regarding positioning accuracy and coverage, this study proposes a multi‐objective optimization framework for the Lunar Navigation Satellite System (LNSS) to support the lunar re‐exploration mission.
Xiao Chen, Zhongkai Zhang, Chonghui Li, Yong Zheng, Lan Du, Jianguo Yan   +5 more
wiley   +1 more source

Distributed angle‐only orbit determination algorithm for non‐cooperative spacecraft based on factor graph

IET Radar, Sonar &Navigation, Volume 18, Issue 9, Page 1494-1514, September 2024.
Two distributed algorithms based on factor graphs are proposed, utilising multiple CubeSats angle measurements for the orbit determination of the non‐cooperative spacecraft. The algorithms are applied to the sub‐parent and distributed cluster spacecraft architectures, respectively.
Zhixun Zhang, Keke Zhang, Leizheng Shu, Zhencai Zhu, Meijiang Zhou   +4 more
wiley   +1 more source

Efficient CoMoS Catalysts Supported on Bio-Inspired Polymer Coated Alumina for Hydrotreating Reactions

, 2017
International audienceOrganic additives are widely used in order to improve theperformance of hydrotreating catalysts. Yet, the use ofpolymers, in particular bio-polymers, is less widespread.
Uzio, Denis, Munirathinam, Rajesh, Pirngruber, Gerhard, Laurenti, Dorothée   +3 more
core   +1 more source

The use of anthropogenic areas helps explain male brown bear movement rates and distance travelled during the mating season

Journal of Zoology, Volume 324, Issue 1, Page 83-96, September 2024.
This paper investigated the movement behaviour of GPS‐tracked male brown bears in Finland during the mating vs. non‐mating season and the potential influence of anthropogenic presence. Throughout the year, male bears selected forested/shrub habitats and increased movement rates near main roads, as well as roaming behaviour during the mating season. All
D. Falcinelli, M. del Mar Delgado, I. Kojola, S. Heikkinen, C. Lamamy, V. Penteriani   +5 more
wiley   +1 more source

A Low-Cost Underground Garage Navigation Switching Algorithm Based on Kalman Filtering

Sensors, 2019
Modern parking lots have gradually developed into underground garages to improve the efficient use of space. However, the complex design of parking lots also increases the demands on vehicle navigation. The traditional method of navigation switching only
Ningbo Li, Yanbin Gao, Ye Wang, Zhejun Liu, Lianwu Guan, Xin Liu   +5 more
doaj   +1 more source

Research on Design and Staged Deployment of LEO Navigation Constellation for MEO Navigation Satellite Failure

Remote Sensing
Low Earth orbit (LEO) satellites have unique advantages in navigation because of their high signal intensity and rapid geometric changes in a short period.
Wen Xue, Min Hu, Yongjing Ruan, Xun Wang, Moyao Yu   +4 more
doaj   +1 more source