Results 71 to 80 of about 96,176 (211)

Temporal stability of soil moisture and radar backscatter observed by the advanced Synthetic Aperture Radar (ASAR) [PDF]

, 2008
The high spatio-temporal variability of soil moisture is the result of atmospheric forcing and redistribution processes related to terrain, soil, and vegetation characteristics.
Annett Bartsch, Doubkova, Marcela, Bartsch, Annett, Pathe, Carsten, Scipal, K., Klaus Scipal, Günter Blöschl, Bloschl, G., Martinez-Fernandez, J., Pathe, C., Wolfgang Wagner, Alexander Löw, Scipal, Klaus, Hasenauer, Stefan, Doubkova, M., Bloschl, Guenter, Bartsch, A., José Martínez-Fernández, Sabel, Daniel, Löw, Alexander, Stefan Hasenauer, Loew, A., Daniel Sabel, Marcela Doubkova, Hasenauer, S., Wagner, W., Carsten Pathe, Martinez-Fernandez, Jose, José Martínez-Fernández, Wagner, Wolfgang, Günter Blöschl, Sabel, D., Alexander Löw   +32 more
core   +1 more source

Coordinated optical and radar observations of ionospheric pumping for a frequency pass through the second electron gyroharmonic at HAARP [PDF]

, 2007
On 4 February 2005, the High-frequency Active Auroral Research Program (HAARP) facility was operated in O and X mode while pointing into the magnetic zenith to produce artificial optical emissions in the ionospheric F layer. The pump frequency was set to
Senior, Andrew, Pedersen, T., Kosch, Mike J., Bristow, B., Mishin, E., Watkins, B., Hughes, J., Oyama, S.   +7 more
core  

An investigation of a frequency diverse array [PDF]

, 2009
This thesis presents a novel concept for focusing an antenna beam pattern as a function of range, time, and angle. In conventional phased arrays, beam steering is achieved by applying a linear phase progression across the aperture.
Antonik, P.
core  

Radar spectrum opportunities for cognitive communications transmission [PDF]

, 2008
In relation to opportunistic access to radar spectrum, the impact of the radar on a communication system is investigated in this paper. This paper illustrates that by exploring the spatial and temporal opportunities in the radar spectrum and therefore ...
Williams, C, Joe McGeehan, Wang, L, Chris Williams, Angela Doufexi, McGeehan, JP, Doufexi, A, Lingfeng Wang   +7 more
core   +1 more source

An Overview on Development of Passive Radar Based on the Low Frequency Band Digital Broadcasting and TV Signals

Leida xuebao, 2012
Starting from the detection principle and characteristics of passive radar, this paper describes the development of passive radar based on the low frequency band (HF/VHF/UHF) digital broadcasting and TV signal.
Wan Xian-rong
doaj   +1 more source

Compressed sensing of monostatic and multistatic SAR [PDF]

, 2013
In this letter, we study the impact of compressed data collections from a synthetic aperture radar (SAR) sensor on the reconstruction quality of a scene of interest.
Çetin, Müjdat, W. Clem Karlb, Mujdat Cetinc, Stojanovic, Ivana, Karl, W. Clem, Ivana Stojanovica   +5 more
core   +1 more source

Estimating Coastal Winds by Assimilating High-Frequency Radar Spectrum Data in SWAN. [PDF]

Sensors (Basel), 2021
Muscarella P, Brunner K, Walker D.
europepmc   +1 more source

Estimation of the Wind Field with a Single High-Frequency Radar

Remote Sensing
Over several decades, high-frequency (HF) radars have been employed for remotely measuring various ocean surface parameters, encompassing surface currents, waves, and winds. Wind direction and speed are usually estimated from both first-order and second-order Bragg-resonant scatter from two or more HF radars monitoring the same area of the ocean ...
Abïgaëlle Dussol, Cédric Chavanne
openaire   +2 more sources

The dependence of radar target detectability on array weighting function [PDF]

, 2009
Presented at the IET-Radar 2007 Conference Edinburgh 15-18 October 2007This paper describes simulation work to assess the detectability of targets by an airborne fire control radar (FCR) operating in a medium pulse repetition frequency (PRF) mode in ...
Alabaster, Clive M., Hughes, Evan J.
core  

Fractional fourier transform based monopulse radar for combating jamming interference [PDF]

, 2010
Monopulse radars are used to track a target that appears in the look direction beam width. The distortion produced when manmade high power interference (jamming).
S.A. Elgamel, Elgamel, Sherif A.E.H., Soraghan, J.J., J.J. Soraghan   +3 more
core   +1 more source