Results 21 to 30 of about 2,062 (173)
Noncontact assessment for fatigue based on heart rate variability using IR-UWB radar
Scientific Reports, 2022 Physical fatigue can be assessed using heart rate variability (HRV). We measured HRV at rest and in a fatigued state using impulse-radio ultra wideband (IR-UWB) radar in a noncontact fashion and compared the measurements with those obtained using ...
Sarfaraz Ahmed +5 more
doaj +1 more source
HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network [PDF]
Frontiers in Marine Science, 2017 High Frequency Radar (HFR) is a land-based remote sensing instrument offering a unique insight to coastal ocean variability, by providing synoptic, high frequency and high resolution data at the ocean atmosphere interface. HFRs have become invaluable tools in the field of operational oceanography for measuring surface currents, waves and winds, with ...
Rubio, Anna +17 more
openaire +6 more sources
A comparison of satellite scintillation measurements with HF radar backscatter characteristics [PDF]
Annales Geophysicae, 2005 We examine the correspondence between high latitude ionospheric scintillation measurements made at 250MHz with the occurrence of 10MHz HF coherent radar backscatter, on 13 and 14 December 2002.
S. E. Milan +3 more
doaj +1 more source
Mapping Wind Directions with HF Radar
Oceanography, 1997 BESIDES THE MEASUREMENT of ocean surface currents, high-frequency (HF) radar has also been demonstrated to be effective at measuring the wind direction at scales on the order of one to several kilometers and over areas of millions of square kilometers in the case of sky-wave HF radars (Georges et al.
Graber, Hans C. +3 more
openaire +2 more sources
Validation of HF Radar Measurements [PDF]
Oceanography, 1997 made? H F RADARS ARE A UNIQUE and powerful tool for measuring surface currents. They provide an unpa ra l l e l ed window into the spat ial var ia t ions of near-surface currents. But oceanographers who are more accus tomed to measur ing currents with instruments that actually get wet may reasonably ask how accurate can such remote measurements be made?
Rick Chapman, Hans Graber
openaire +1 more source
Phenomena induced by powerful HF pumping towards magnetic zenith with a frequency near the F-region critical frequency and the third electron gyro harmonic frequency [PDF]
Annales Geophysicae, 2009 Multi-instrument observational data from an experiment on 13 October 2006 at the EISCAT/HEATING facility at Tromsø, Norway are analysed. The experiment was carried out in the evening hours when the electron density in the F-region dropped, and the HF ...
N. F. Blagoveshchenskaya +6 more
doaj +1 more source
Introduction to Coastal HF Maritime Surveillance Radars
Polish Maritime Research, 2019 This paper presents the main technical characteristics and working performances of coastal maritime surveillance radars, such as low-power High-Frequency Surface Wave Radars (HFSWR) and Over the Horizon Radars (OTHR). These radars have demonstrated to be
Ilcev Dimov Stojce
doaj +1 more source
IEEE Access, 2019 High-frequency (HF) surface-wave (SW) radar systems have demonstrated their capability to capture the signals from seismic and non-seismic tsunami events using the estimation of surface current changes. Several ocean radar systems, operating in the upper
Anna Dzvonkovskaya +4 more
doaj +1 more source
Letter to the Editor: First complementary observations by ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar [PDF]
Annales Geophysicae, 1998 Experimental results are presented from ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar. Tomographic measurements on 10 October 1996, showing a narrow, field-aligned enhancement in electron density in the post-noon sector of
C. N. Mitchell +5 more
doaj +1 more source
First-order Sea Clutter Modeling and Simulation of High Frequency Passive Radar
Leida xuebao, 2015 High Frequency (HF) passive radar is a typical bistatic radar, and the modeling and simulation of sea clutter in bistatic radar are worth researching for HF passive radar.
Cheng Feng, Zeng Qing-ping, Gong Zi-ping
doaj +1 more source