4 edition of An HF ocean backscatter radar with optimized range performance found in the catalog.
An HF ocean backscatter radar with optimized range performance
M. L. Heron
by Physics Dept., James Cook University of North Queensland in Townsville, Qld
Written in English
|Statement||by M.L. Heron.|
|Series||Natural philosophy research report,, no. 87|
|LC Classifications||GC211.2 .H47 1988|
|The Physical Object|
|Pagination||13, 6 leaves ;|
|Number of Pages||13|
|LC Control Number||90100017|
MA05CHPaduan ARI 9 November High-Frequency Radar Observations of Ocean Surface Currents Jeffrey D. Paduan1 and Libe Washburn2 1Department of Oceanography, Naval Postgraduate School, Monterey, California ; email: [email protected] 2Department of Geography and Earth Research Institute, University of California, Santa Barbara, California ; email: . IEEE Journal of Oceanic Engineering, 16, Wyatt L.R., , Limits to the inversion of HF radar backscatter for ocean wave measurement. Journal of Atmospheric and Oceanic Technology, 17, Wyatt, L.R., , An evaluation of wave parameters measured using a single HF radar system. Canadian Journal of Remote Sensing, 28,
Background for HF Radar History The present state of the U.S. na-tional high-frequency (HF) radar net-workhas resulted from nearly40 years of research and applications. HF radar observations of the ocean surface truly began with Crombie’s () experi-mental discovery of the mechanism behind his puzzling analog sea-echo spectral plots. Don. CODAR Ocean Sensors SeaSonde HF Radar System - High-frequency (HF) radar uses radio-wave backscatter to map surface currents over wide swaths of the coastal ocean. The Bodega Marine Laboratory operates five HF Radar stations located in Bodega .
Abstract: Linear expressions relating ocean surface wind speed to a theoretical estimate of the - 10 dB width of the high frequency (HF) sea echo Doppler spectrum ( Hz Doppler shift frequency resolution) are derived for different radar frequencies. The dB width, determined from theoretical model estimates of the Doppler spectrum as a function of radar frequency for a wide range of. HF radar also helps us understand local ocean current phenomena that are hard to detect by other methods because these ocean features are relatively small. A collaborative effort The project is a partnership that combines expertise and personnel from the University of Alaska Fairbanks (UAF) with funding from the US Bureau of Ocean Energy.
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A major criterion of the HF coherent radar technique entails that the HF waves propagate orthogonal to the geomagnetic field lines (aspect angle 1°) in the ionospheric irregularity region from where backscatter originates. In this paper we present an HF ray tracing simulation of the performance of three proposed equatorial HF radar systems for Cited by: 1.
Three long-range (5 MHz) Coastal Ocean Dynamics Application Radar (CODAR) SeaSonde HF radars overlooking an array of as many as eight moored acoustic Doppler current profilers (ADCPs) have operated on the West Florida Shelf since September for the purpose of observing the coastal ocean currents.
HF radar performance on this low-energy (currents and waves) continental shelf is. In Mayan onshore oil pipeline burst which sent oil flowing into the Pacific Ocean in the area of Refugio State Beach Park.
Although existing radars, operated by University of California-Santa Barbara (UCSB), covered a large portion of the local coastline, a temporary HF radar site was quickly installed by UCSB to add radar coverage north of the spill.
High Frequency (HF) coastal radar systems measure and employ the Doppler spectrum of the sea-echo signal to extract relevant ocean surface parameters. The dominant first-order spectral peaks provide mean surface currents; at medium frequencies (MF) they have been used to yield directional information about the wave height by: 9.
JANARDHANAN et al.: HF BACKSCATTER RADAR AT MAGNETIC EQUATOR 79 is programmable from 20 onwards. The data samples are separated for each range bin and spectrum analysis is done by discrete Fourier transform (DFT). Provision is made to integrate the power spectra over a specified number of sets.
TheCited by: 9. The U.S. Air Force's over-the-horizon-backscatter (OTH-B) air defense radar system is by several criteria the largest radar system in the world. Six one-million-watt OTH radars see far beyond the range of conventional microwave radars by bouncing their MHz waves off the ionosphere, an ionized layer about km above the earth.
The basic concept of the structure and properties of the ionosphere are discussed to explain how the performance of the over-the-horizon radar (OTHR) system is affected. An overview of the OTHR system characteristics and performance are presented along with some applications currently used around the world, including their geographic location and historical background.
High-frequency (HF) radars based on ground-wave propagation are used for re-motely sensing ocean surface currents and gravity waves.
For some 20 years a number of sytems have been developed taking advantage of improved electronics and computer techniques. However, the performance of these systems are limited.
Wave measurements are obtained from HF radar backscatter using the theoretical relationship between the ocean wave directional spectrum and the backscatter power spectrum developed by Barrick (), Barrick and Weber (), and Weber and Barrick ().Simple empirical relationships between the moments of the backscatter spectrum and equivalent moments of the ocean.
High-Frequency Radar Ocean Surface Current Observations Jeffrey D. Paduan, Kyung Cheol Kim, Michael S. Cook, and Francisco P. Chavez The technology of radiowave backscatter measurements in the high-frequency (HF) portion of the electromagnetic The offshore range resolutions of the radar systems were set to 3 km in the case of.
IEEE. km at range cells km offshore (Fig. Measuring Winds and Waves Although the focus of this special issue, and many of the experiments using ground wave HF radar systems, is on surface currents, it is also possible to extract information about surface waves and winds from HF backscatter spectra.
A new high-frequency backscatter radar (Wuhan Ionospheric Oblique Backscattering Sounding System) for ionospheric sensing and study has been developed. Wit A Low-Power and Small-Size HF Backscatter Radar for Ionospheric Sensing - IEEE Journals & Magazine.
This article reviews the discovery, development, and use of high-frequency (HF) radio wave backscatter in oceanography. HF radars, as the instruments are commonly called, remotely measure ocean surface currents by exploiting a Bragg resonant backscatter phenomenon.
Electromagnetic waves in the HF band (3–30 MHz) have wavelengths that are commensurate with wind-driven gravity. The received signal is a superposition of HF waves, which have been backscattered at different distances from the radar: (2) r(t)=∫α(τ) sin 2π ν o + b 2T (t−τ) (t−τ)+ϕ(τ) d τ, where τ is the propagation time from the radar to the scattering area and back, i.e., a measure of the range.
gle of UHF backscatter can be calculated purely on the ba-sis of the radar look-direction and magnetic ﬁeld geometry. At these frequencies, backscatter is observed at aspect an-gles as high as 12 or 13 (Moorcroft,), though backscatter power is found to.
The Unique Nature of HF Radar High-frequency (HF) radio formally spans the band MHz (with wavelengths between 10 meters at the upper end and meters at the lower end). When the radar signal hits ocean waves that are meters long, that signal scatters in many directions. The first determination is Range to target.
The most widely accepted ocean sensing radars include but are not limited to the high-frequency (HF) surface wave and sky wave radars, microwave nautical radar, and laser radar (LIDAR). These “ocean radars” are able to provide sea surface information such as wind, wave, current, hard target, and bathymetry with different spatial and.
• CODAR Invents Crossed-Loop/Monopole Antenna System with FMCW Waveform Pulsing to Optimize Use with Backscatter Radars: D.E. Barrick, B.J. Lipa, P.M. Lilleboe, and J. Isaacson (), Gated FMCW HF radar and signal processing for range/Doppler/angle determination, U.
Patent 5 Backscatter Range Resolution (assuming the speed of light): 29 miles made extensive studies of ocean currents and other weather parameters using very sensitive over-the-horizon HF Doppler Radar reflections off ocean waves.
11 Since HF antennas illuminate an area of the ocean and not individual ocean waves both constructive and destructive. After working with HF over-the-horizon radar (OTHR) for 40 years (), it is my great pleasure that I was asked to review the comprehensive HF over-the-horizon radar book recently published by Dr.
Giuseppe (Joe) Fabrizio from Australia. This indeed is an amazing s:. High Frequency Over-The-Horizon Radar Fundamental Principles, Signal Processing, and Practical Applications Posted on by hucyh Highв•frequency overв•theв•horizon radar and - .able to see strong land or ocean backscatter returns from approximately the same range as the ta,'get.
This indicates that the ionosphere is able to support the propagation of radio energy to the desired range. A typical airc-aft radar cross-section varies from m2 to 1, m2 depending on. High Frequency Surface Wave Radar (HFSWR) has been shown to provide enhanced performance in over the horizon detection of targets and sea states remote sensing by the returns of targets and ocean surface.
Meanwhile, HFSWR can also receive ionospheric echoes reflected by the ionosphere, which severely affect the radar detection performance.