Results 11 to 20 of about 188 (137)

Over‐the‐Horizon Direct Positioning With Ionospheric Heights Priors

IET Radar, Sonar & Navigation
This study addresses positioning errors in high‐frequency (HF) over‐the‐horizon (OTH) localisation that arise from inaccuracies in ionospheric virtual height measurements.
Shuyu Zheng, Haiying Zhang, Xiuquan Dou
doaj   +2 more sources

Adaptive Transient And Cw Rf Interference Mitigation In Hf Oth Radar: Experimental Results [PDF]

, 2008
We introduce an adaptive technique for the joint mitigation of transients and continuous-wave radio-frequency co-channel interference (CW RFI) in high-frequency (HF) over-the-horizon radars (OTHRs). The performance of this technique is illustrated using data from an operational surface-wave radar (SECAR) and from recent experimental trials with sky ...
Turcaj, P., Abramovich, Y., Frazer, G.
openaire   +3 more sources

Surface waves magnitude estimation from ionospheric signature of Rayleigh waves measured by Doppler sounder and OTH radar. [PDF]

Sci Rep, 2018
International audienceSurface waves emitted after large earthquakes are known to induce atmospheric infrasonic waves detectable at ionospheric heights using a variety of techniques, such as high frequency (HF) Doppler, global positioning system (GPS ...
Occhipinti G, Aden-Antoniow F, Bablet A, Molinie JP, Farges T.   +4 more
europepmc   +3 more sources

A CFAR‐like detector based on neural network for simulated high‐frequency surface wave radar data

IET Radar, Sonar &Navigation, Volume 17, Issue 5, Page 859-875, May 2023., 2023
This article presents a deep neural network‐based constant false alarm rate detector for high‐frequency surface wave radar. A deep neural network is trained to identify fluctuation parameters of each cell of a range‐Doppler power spectrum based on the patterns present in the neighbouring cells.
Rômulo Fernandes da Costa, Diego da Silva de Medeiros, Osamu Saotome, Renato Machado   +3 more
wiley   +1 more source

Generation and Assimilation of Propagation Advice for HF Skywave Radar Systems [PDF]

, 2008
HF skywave (OTH) radars operate in a very challenging environment so the objective of optimizing the radar resources to address the surveillance missions can be achieved only with the aid of a variety of support systems and models.
ANDERSON S, BIANCHI C., BERIZZI, FABRIZIO   +2 more
core   +3 more sources

Joint correction method for ionospheric phase pollution of high‐frequency sky‐surface wave radar based on adaptive optimal path

IET Radar, Sonar &Navigation, Volume 17, Issue 4, Page 701-718, April 2023., 2023
Abstract The high‐frequency (HF) hybrid sky‐surface wave system is a new early warning radar. However, due to the influence of bistatic angle and ionospheric phase path disturbance, the echo spectrum will be widened, which seriously affects the ability of detecting slow targets of ships.
Yajun Li, Zhuoqun Wang, Wenhao Zhang, Zhuhao Lu, Lin Xu, Zhicheng Wang   +5 more
wiley   +1 more source

Impacts of Auroral Precipitation on HF Propagation: A Hypothetical Over‐the‐Horizon Radar Case Study

Space Weather, Volume 19, Issue 12, December 2021., 2021
Abstract Over‐the‐horizon radar (OTHR) systems operating in the high‐frequency (HF) band (3–30 MHz) are unique in their ability to detect targets at extreme ranges, offering cost‐effective large‐area surveillance. Due to their reliance on the reflective nature of the ionosphere in this band, OTHR systems are extremely sensitive to ionospheric ...
Joshua J. Ruck, David R. Themens
wiley   +1 more source

Challenges in Specifying and Predicting Space Weather

Space Weather, Volume 19, Issue 2, February 2020., 2021
Abstract Physics‐based Data Assimilation (DA) has been shown to be a powerful technique for specifying and predicting space weather. However, it is also known that different data assimilation models simulating the same geophysical event can display different space weather features even if the same data are assimilated.
R. W. Schunk, L. Scherliess, V. Eccles, L. C. Gardner, J. J. Sojka, L. Zhu, X. Pi, A. J. Mannucci, A. Komjathy, C. Wang, G. Rosen   +10 more
wiley   +1 more source

A general presentation about the OTH-Radar NOSTRADAMUS [PDF]

, 2006
International audienceONERA, funded by the French Ministry of Defence has conducted the realization and experimentations of the Doppler Skywave OTH Radar called NOSTRADAMUS.
Dorey, P., Bazin, V., Rannou, V., Munoz, J., Auffray, Gilbert, Lesturgie, Marc, Molinie, J.P., Saillant, S.   +7 more
core   +1 more source

LED lighting systems for smart buildings: a review

IET Smart Cities, Volume 2, Issue 3, Page 126-134, September 2020., 2020
This study presents a review of smart light‐emitting diode (LED) lighting systems applied to smart buildings. The study is focused on drivers, protocols, technologies, communication networks and applications. An extended overview of the methodologies used for LED lighting control in smart buildings is addressed.
Héctor F. Chinchero, J. Marcos Alonso, Hugo Ortiz T   +2 more
wiley   +1 more source