Filters








111 Hits in 5.5 sec

Wave Height and Wave Period Derived from a Shipboard Coherent S-Band Wave Radar in the South China Sea

Chen, Chen, Zhao, Wang
2019 Remote Sensing  
This radar provides a calibration-free way to measure wave parameters and is a novel underway coherent microwave wave radar.  ...  To expand the scope of ocean wave observations, a shipboard coherent S-band wave radar system was developed recently.  ...  To date, the microwave radars used to monitor ocean waves can be divided into two main types of systems: coherent and noncoherent.  ... 
doi:10.3390/rs11232812 fatcat:pcon3vf5p5dfrm2ffcg65qdsya

Surface-Wavefield Estimation From Coherent Marine Radars

Okey G. Nwogu, David R. Lyzenga
2010 IEEE Geoscience and Remote Sensing Letters  
In this letter, a more direct 7 approach is proposed to infer nonlinear sea-surface heights by 8 using radial-velocity measurements from coherent marine radars. 9 The radial velocities are initially integrated  ...  One major impediment to using marine radars for 4 real-time shipboard measurements of evolving ocean wavefields Q1 5 is the uncertainty in the transfer function that relates the radar 6 cross section to  ...  Coherent marine radars can be used to directly 40 measure near-surface wave orbital velocities, thereby avoiding 41 some of the pitfalls associated with deriving a physics-based 42 MTF, although problems  ... 
doi:10.1109/lgrs.2010.2043712 fatcat:fyoglqslc5fsxewu5zshco3utm

Multifrequency HF radar observations of currents and current shears

C. Teague
1986 IEEE Journal of Oceanic Engineering  
The measurement of current velocity with an HF radar depends on the ability of the radar to precisely measure the phase velocity and direction of propagation of ocean waves whose wavelength is one-half  ...  A portable coherent, pulsed-Doppler HF radar system was developed -at* Se u4and used in several experiments, both on land on the California coast and on board a ship during the JASIN experiment.  ...  In order to do this, a curvefitting procedure was used, based on a model the ocean-wave directional spectrum as a single-peaked distribution of the form cos'((0 -Oo)/2).  ... 
doi:10.1109/joe.1986.1145178 fatcat:cm3ly2ad3vhxfj6upqalpwm3ym

X band microwave backscattering from ocean waves

P. H. Y. Lee, J. D. Barter, K. L. Beach, C. L. Hindman, B. M. Lake, H. Rungaldier, J. C. Shelton, A. B. Williams, R. Yee, H. C. Yuen
1995 Journal of Geophysical Research  
Rungaldier, "Microwave scattering from internal wave modul_ited surface waves: A shipboard real aperture coherent radar study in the Georgia Strait Experiment", J. Geophys.  ...  No such correction is made for the RSRE data since a range-resolving radar in conjunction with a l°-beamwidth antenna was used for the measurement.  ... 
doi:10.1029/94jc02741 fatcat:fljxm3xburhvxfwajii4ur3aoy

Wind-wave-induced velocity in ATI SAR ocean surface currents: First experimental evidence from an airborne campaign

Adrien C. H. Martin, Christine Gommenginger, Jose Marquez, Sam Doody, Victor Navarro, Christopher Buck
2016 Journal of Geophysical Research - Oceans  
direction.  ...  Conventional and along-track interferometric (ATI) Synthetic Aperture Radar (SAR) senses the motion of the ocean surface by measuring the Doppler shift of reflected signals.  ...  Once corrected, SAR and ATI SAR can provide measurements of ocean surface currents and winds at high spatial resolution, which are valuable for a wide range of atmospheric and oceanographic issues, including  ... 
doi:10.1002/2015jc011459 fatcat:3vrkgqdv5jfmrer2ppameymetu

Measurement of Sea Waves

Giovanni Battista Rossi, Andrea Cannata, Antonio Iengo, Maurizio Migliaccio, Gabriele Nardone, Vincenzo Piscopo, Enrico Zambianchi
2021 Sensors  
Therefore, the main measurement techniques for their monitoring are here reviewed, including buoys, satellite observation, coastal radars, shipboard observation, and microseism analysis.  ...  Sea waves constitute a natural phenomenon with a great impact on human activities, and their monitoring is essential for meteorology, coastal safety, navigation, and renewable energy from the sea.  ...  Acknowledgments: The authors want to thank two anonymous reviewers, whose comments were useful to improve the paper.  ... 
doi:10.3390/s22010078 pmid:35009617 pmcid:PMC8747634 fatcat:qolp2buz7bgyzecnwrs2f4o3am

High-Frequency Radar Observations of Ocean Surface Currents

Jeffrey D. Paduan, Libe Washburn
2013 Annual Review of Marine Science  
HF radars, as the instruments are commonly called, remotely measure ocean surface currents by exploiting a Bragg resonant backscatter phenomenon.  ...  This article reviews the discovery, development, and use of high-frequency (HF) radio wave backscatter in oceanography.  ...  The evolving surface current fields of the eddies were mapped by HF radar and then used to direct shipboard trawl sampling for larval fishes in real time.  ... 
doi:10.1146/annurev-marine-121211-172315 pmid:22809196 fatcat:m4cws7pg7vg2vomyephralbdgq

A Motion-Stabilized W-Band Radar for Shipboard Observations of Marine Boundary-Layer Clouds

Ken Moran, Sergio Pezoa, Chris Fairall, Chris Williams, Tom Ayers, Alan Brewer, Simon P. de Szoeke, Virendra Ghate
2011 Boundary-layer Meteorology  
Cloud radars at X, Ka and W-bands have been used in the past for ocean studies of clouds, but the lack of suitable stabilization has limited their usefulness in obtaining accurate measurements of the velocity  ...  A 94 GHz (W-band) radar suitable for use on shipboard studies of clouds has been developed that is small and lightweight and can maintain the radar's beam pointing in the vertical to reduce the affects  ...  The W-band radar does not use coherent pulse integration and therefore NCI = 1.  ... 
doi:10.1007/s10546-011-9674-5 fatcat:zufrjcxbn5chpi7hqhe6rctepq

Atmospheric Latent Heating Distributions in the Tropics Derived from Satellite Passive Microwave Radiometer Measurements

William S. Olson, Christian D. Kummerow, Ye Hong, Wei-Kuo Tao
1999 Journal of applied meteorology (1988)  
Although instantaneous estimates of rain rates are high-biased with respect to coincident radar rain estimates, precipitation patterns are reasonably correlated with radar patterns, and composite rain  ...  An estimate of the areal coverage of convective precipitation within the radiometer footprint is used as an additional constraint on the contributing model profiles.  ...  We would also like to thank Peter Dodge of NOAA/AOML/ HRD for providing digitized radar observations of Hurricane Andrew. This research was funded by the TRMM science program.  ... 
doi:10.1175/1520-0450(1999)038<0633:alhdit>2.0.co;2 fatcat:ikd6pez4ajb2niarcswuv72ut4

Effects of rain on Ku-band backscatter from the ocean

Robert F. Contreras
2003 Journal of Geophysical Research  
Coincident with the backscatter measurements, measurements of rain rate, wind speed, wind direction, and fluxes of heat and momentum were made.  ...  1] During the Kwajalein Experiment (KWAJEX) in July and August 1999, measurements of the normalized radar cross section of the ocean, s o , were made at Ku-band with HH and VV polarizations from the R/  ...  For SeaWinds, which determines wind speed and direction over the ocean from microwave return at incidence angles of 46°a nd 54°, rain changes the basic signal used for the measurement both by causing scattering  ... 
doi:10.1029/2001jc001255 fatcat:wlibtdtg7zaq5jcv7q3skzhzj4

Shipboard Radar Rainfall Patterns within the TOGA COARE IFA

David A. Short, Paul A. Kucera, Brad S. Ferrier, John C. Gerlach, Steven A. Rutledge, Otto W. Thiele
1997 Bulletin of The American Meteorological Society - (BAMS)  
Radar rainfall measurements over the equatorial western Pacific warm pool were collected by two shipboard Doppler  ...  The overall radar program was conducted under the direction of Chief Scientists O. W. Thiele (NASA/Goddard Space Flight Center; NOAA/TOGA radar) and S. A.  ...  Rutledge (Colorado State University; MIT radar). The R/V Xiang Yang Hong #5, from the State Oceanic Administration of the People's Republic of China, carried the NOAA/TOGA radar and the R/V J. V.  ... 
doi:10.1175/1520-0477(1997)078<2817:srrpwt>2.0.co;2 fatcat:u54cvev6jja4fdgaaqnipismjq

Surface current variability east of Okinawa Island obtained from remotely sensed and in situ observational data

Yukiharu Hisaki, Tsutomu Tokeshi, Wataru Fujiie, Kenji Sato, Satoshi Fujii
2001 Journal of Geophysical Research  
(One of the few exceptions is the study by Teague [1986], who used a portable shipboard HF radar system.)  ...  The HF-radar-derived ocean currents agree with those measured by a current meter.  ...  The GFD-DENNOU Library (http:// dennou.gaia.h.kyoto-u.ac.jp/arch/dcl/) was used in drawing the figures.  ... 
doi:10.1029/2000jc000784 fatcat:dbdoy5hdqnbzpmxaxygb2j4vdm

On radar imaging of current features: 1. Model and comparison with observations

V. Kudryavtsev
2005 Journal of Geophysical Research  
Wave breaking plays a key role in the radar imaging model.  ...  It is shown that modulation of wave breaking significantly influences both radar returns and short wind waves.  ...  JOWIP: TRW Run 81B [63] During the JOWIP experiment, shipboard real aperture coherent radar studies of internal waves were carried out [Kwoh et al., 1988] .  ... 
doi:10.1029/2004jc002505 fatcat:3nzt4udvknhqrhhzkg7jxhxgwm

Remotely Sensed Winds and Wind Stresses for Marine Forecasting and Ocean Modeling

Mark A. Bourassa, Thomas Meissner, Ivana Cerovecki, Paul S. Chang, Xiaolong Dong, Giovanna De Chiara, Craig Donlon, Dmitry S. Dukhovskoy, Jocelyn Elya, Alexander Fore, Melanie R. Fewings, Ralph C. Foster (+22 others)
2019 Frontiers in Marine Science  
The measurement characteristics of the HF radar winds are related to the frequency of the radar as well as the receiver antenna technology used.  ...  By looking at the same patch of the ocean from different directions using a monostatic HF radar system this ambiguity can be resolved.  ...  No use, distribution or reproduction is permitted which does not comply with these terms.  ... 
doi:10.3389/fmars.2019.00443 fatcat:mbket5dcjvaibhd2j5ngkyvvri

Combined Observations of Meteors by Image-Orthicon Television Camera and Multi-Station Radar

A. F. Cook, G. Forti, R. E. McCrosky, A. Posen, R. B. Southworth, J. T. Williams
1971 International Astronomical Union Colloquium  
Observations from Multiple Sites of a radar network and by television of 29 individual meteors from February 1969 through June 1970 are reported.  ...  From these 12, the following relation for the radar magnitudeMRto the panchromatic absolute magnitudeMp, in terms of velocity of the meteorV, was found:  ...  RADAR EQUIPMENT, OBSERVATIONS, AND REDUCTIONS Radar An eight-station multistatic phase-coherent pulsed Doppler radar system located in the area between Peoria and Springfield, Illinois, was used to observe  ... 
doi:10.1017/s0252921100048934 fatcat:bjxpafycwrbfnfkn43bngyvcya
« Previous Showing results 1 — 15 out of 111 results