Results 71 to 80 of about 541 (116)
Some of the next articles are maybe not open access.
Sea Ice Observation With Oceanographic HF Radar
IEEE Transactions on Geoscience and Remote Sensing, 2020High-frequency (HF) ocean radar has the potential to observe sea ice, but this application has not been thoroughly investigated. In this article, we explore sea ice observation with HF radar (HFR) and develop a corresponding signal processing procedure.
Wei Zhang 0144 +8 more
openaire +1 more source
HF Radar and Auroral Absorption
Radio Science, 1970A description is given of a method, based on riometer observations, for the calculation of auroral absorption of HF radio waves propagating over high‐latitude paths. Emphasis is on HF radar, but the method is appropriate for use in predicting circuit performance of high‐latitude HF communications.
openaire +1 more source
1970
Abstract : Aircraft, ship, and clutter echoes have been studied using surface- wave propagation on the Chesapeake Bay. These studies show that coherent pulse doppler methods can be used for surface target detection. Required radar features for several applications can be estimated.
Frank E. Boyd +3 more
openaire +1 more source
Abstract : Aircraft, ship, and clutter echoes have been studied using surface- wave propagation on the Chesapeake Bay. These studies show that coherent pulse doppler methods can be used for surface target detection. Required radar features for several applications can be estimated.
Frank E. Boyd +3 more
openaire +1 more source
Behavioral model of ionospheric effects in HF radars
2017 11th European Conference on Antennas and Propagation (EUCAP), 2017The sky wave and the surface wave radars can be impacted by the instabilities of the ionosphere while they perform continuous surveillance of very large and far-off areas. When long-term integration is performed, those instabilities are leading to an increased false alarm rate. This is the typical case when detecting slow targets such as vessels.
Abi Akl, Marie José +3 more
openaire +2 more sources
2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM), 2011
This paper briefly reviews the theory behind wave measurement with HF radar. Data from a number of different deployments with different radars, at different frequencies, in different oceanographic conditions are used to demonstrate the wave mapping capability and to illustrate some of the problems that have arisen and solutions that have been ...
openaire +1 more source
This paper briefly reviews the theory behind wave measurement with HF radar. Data from a number of different deployments with different radars, at different frequencies, in different oceanographic conditions are used to demonstrate the wave mapping capability and to illustrate some of the problems that have arisen and solutions that have been ...
openaire +1 more source
The availability and accuracy of HF radar wave measurements
IEEE International Geoscience and Remote Sensing Symposium, 2003The possibility of measuring the ocean wave directional spectrum in real time at up to 350 locations every 10 minutes was demonstrated in the EuroROSE experiments at Fedje, Norway and Gijon, Spain in 2000. These experiments used the WERA HF radar which, at the operating frequency used, had a maximum range for wave measurements of about 20 km. Trials of
Lucy R. Wyatt, J. Jim Green
openaire +1 more source
Journal of Atmospheric and Terrestrial Physics, 1985
Abstract This paper provides an overview of six poster presentations contributed to the Open Symposium on Active Experiments in Space Plasmas at the XXIst General Assembly of URSI. The six poster presentations deal with HF ionospheric modification and are primarily experimental in nature.
openaire +1 more source
Abstract This paper provides an overview of six poster presentations contributed to the Open Symposium on Active Experiments in Space Plasmas at the XXIst General Assembly of URSI. The six poster presentations deal with HF ionospheric modification and are primarily experimental in nature.
openaire +1 more source
Calibration of HF radar systems with ships of opportunity
IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477), 2004This paper addresses the application of ships of opportunity to determine the proper phase corrections for HF ground-wave phased array radar systems. Such HF radar systems are being used more and more extensively for measurements of coastal ocean surface currents.
Daniel M. Fernandez +2 more
openaire +1 more source
Sixth International Conference on `HF Radio Systems and Techniques', 1994
HF over-the-horizon radars often use CW transmissions comprising repeated linear FM sweeps. The resolution and sidelobe performance in the range dimension are determined within each sweep, but Doppler information is extracted by processing together the outputs of a number of sweeps.
openaire +1 more source
HF over-the-horizon radars often use CW transmissions comprising repeated linear FM sweeps. The resolution and sidelobe performance in the range dimension are determined within each sweep, but Doppler information is extracted by processing together the outputs of a number of sweeps.
openaire +1 more source
1970
Abstract : Interference to communication reception near an HF radar is dependent on many factors. It is shown that the most important of these that can be controlled is the pulse shape of the radar. Under optimum conditions, acceptable reception should be possible with frequency separation as little as 21 kHz from the proposed radar.
Burton N. Navid, Frank E. Boyd
openaire +1 more source
Abstract : Interference to communication reception near an HF radar is dependent on many factors. It is shown that the most important of these that can be controlled is the pulse shape of the radar. Under optimum conditions, acceptable reception should be possible with frequency separation as little as 21 kHz from the proposed radar.
Burton N. Navid, Frank E. Boyd
openaire +1 more source