Results 11 to 20 of about 61 (48)
UGV‐UAV robust cooperative positioning algorithm with object detection
IET Intelligent Transport Systems, 2021 Traditional Global Navigation Satellite Systems (GNSS) experience their limitations in urban canyons. However, it is significant to improve the accuracy of positioning with the rapid development of smart cities.
Dongjia Wang +2 more
doaj +2 more sources
Optimised design of next‐generation multiplexing schemes for Global Navigation Satellite Systems
IET Radar, Sonar &Navigation, Volume 17, Issue 7, Page 1100-1104, July 2023., 2023 In the Global Navigation Satellite System domain, the demand of flexible and highly efficient multiplexing algorithms is increasing along with a diversified offer of positioning, navigation, and timing services. The authors’ technique can improve the multiplexing efficiency of multicarrier signals, regardless of the multiplexing algorithm employed, by ...
Andrea Nardin +4 more
wiley +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 +2 more
wiley +1 more source
Target‐driven visual navigation in indoor scenes using reinforcement learning and imitation learning
CAAI Transactions on Intelligence Technology, Volume 7, Issue 2, Page 167-176, June 2022., 2022 Abstract Here, the challenges of sample efficiency and navigation performance in deep reinforcement learning for visual navigation are focused and a deep imitation reinforcement learning approach is proposed. Our contributions are mainly three folds: first, a framework combining imitation learning with deep reinforcement learning is presented, which ...
Qiang Fang +3 more
wiley +1 more source
Positioning with medium frequency R‐Mode
NAVIGATION, Volume 68, Issue 4, Page 829-841, Winter 2021., 2021 Abstract R‐Mode is a terrestrial navigation system under development for the maritime domain that provides backup in case of a GNSS outage. This paper describes the first test results for real‐time positioning on board a ship using medium frequency R‐Mode signals.
Lars Grundhöfer +6 more
wiley +1 more source
Space Weather, Volume 19, Issue 3, March 2021., 2021 Abstract Soil Moisture and Ocean Salinity (SMOS) is an ESA mission observing Earth at 1.4 GHz with full polarimetry. SMOS images are affected by a noise of solar origin produced by the Sun appearing in the antenna's field of view. In this paper, we study whether this solar signal is of any use for scientific and space weather observations.
M. Flores‐Soriano +2 more
wiley +1 more source
Robust navigation using angle of arrival measurements [PDF]
The majority of conventional radionavigation systems are based on Time of Arrival (TOA) measurements of RF signals. By far the most common method is pseudoranging, mainly a result of the undisputed success of Global Navigation Satellite Systems (GNSS) as
Swaszek, Peter +4 more
core +1 more source
Wideband reconfigurable vector antenna for 3-D direction finding application [PDF]
, 2019 Direction finding plays a crucial role in various civilian and military applications, related to either radionavigation or radiolocation. Most of the direction finding antennas operate over a wide frequency band, but only a minority of them enable the ...
Duplouy, Johan
core
IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.To meet the high‐performance PNT requirements of the low‐altitude economy, this paper proposes OCDM‐BCS, a novel integrated navigation and communication modulation scheme. Leveraging its linear frequency modulation (LFM) characteristics, OCDM‐BCS demonstrates superior code tracking accuracy, anti‐interference robustness and anti‐multipath capabilities ...
Bofang Chen +4 more
wiley +1 more source
IET Intelligent Transport Systems, Volume 19, Issue 1, January/December 2025.This study presents a dual‐component reliability model for marine radionavigation systems, accounting for both gradual degradation and sudden failures under harsh maritime conditions. The approach integrates failure rate estimation, MTBF analysis and scenario‐based simulation to predict critical operational thresholds and optimise maintenance planning.
Oleksiy Melnyk +6 more
wiley +1 more source