HF Radar Instruments, Past to Present

Teague, C.C.; Vesecky, J.F.; Fernandez, D.M.

doi:10.5670/oceanog.1997.19

Cited by 53 publications

(21 citation statements)

References 26 publications

(23 reference statements)

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“…The difference between the two signals is constant when the signals are both present (because they both increase at the same rate) but will increase as long as the backscattered signal comes back to the antenna (Teague et al 1997). The time lag during which the signal difference is not constant provides the time that must be multiplied by the electromagnetic wave velocity to obtain the range to the target.…”

Section: General Principles Of Hfr Functioningmentioning

confidence: 99%

Dynamics and sea state in the Gulf of Naples: potential use of high-frequency radar data in an operational oceanographic context

Falco

Buonocore

Cianelli

et al. 2016

Journal of Operational Oceanography

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High-frequency coastal radars (HFRs) have proved to be excellent tools for monitoring coastal circulation, providing synoptic, high spatial and temporal resolution surface current data in real time. They may also give detailed information on the surface wave field of coastal areas. An HFR has been operating in the Gulf of Naples (south-eastern Tyrrhenian Sea) since 2004. In this paper we show the results of their utilisation in the study of the Gulf dynamics and sea state, with a focus on potential applications in the context of operational oceanography.

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Section: General Principles Of Hfr Functioningmentioning

confidence: 99%

Dynamics and sea state in the Gulf of Naples: potential use of high-frequency radar data in an operational oceanographic context

Falco

Buonocore

Cianelli

et al. 2016

Journal of Operational Oceanography

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“…The direction finding radars use a three element receive antenna mounted on a single post to determine the direction of the incoming signals. The angular resolution, set in the processing, is 5° (Barrick and Lipa 1996;Teague et al 1997). Since the Doppler shift can only resolve the component of the current moving toward or away from the site, information from at least two sites must be geometrically combined to generate total surface current maps.…”

Section: Hf Radar Processingmentioning

confidence: 99%

Evaluation of two algorithms for a network of coastal HF radars in the Mid-Atlantic Bight

et al. 2012

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The National High Frequency (HF) Surface Current Mapping Radar Network is being developed as a backbone system within the U.S. Integrated Ocean Observing System. This paper focuses on the application of HF radarderived surface current maps to U.S. Coast Guard Search and Rescue operations along the Mid-Atlantic coast of the USA. In that context, we evaluated two algorithms used to combine maps of radial currents into a single map of total vector currents. In situ data provided by seven drifter deployments and four bottom-mounted current meters were used to (1) evaluate the well-established unweighted least squares (UWLS) and the more recently adapted optimal interpolation (OI) algorithms and (2) quantify the sensitivity of the OI algorithm to varying decorrelation scales and error thresholds. Results with both algorithms were shown to depend on the location within the HF radar data footprint. The comparisons near the center of the HF radar coverage showed no significant difference between the two algorithms. The most significant distinction between the two was seen in the drifter trajectories. With these simulations, the weighting of radial velocities by distance in the OI implementation was very effective at reducing both the distance between the actual drifter and the cluster of simulated particles as well as the scale of the search area that encompasses them. In this study, the OI further reduced the already improved UWLS-based search areas by an additional factor of 2. The results also indicated that the OI output was relatively insensitive to the varying decorrelation scales and error thresholds tested.

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“…Each antenna can measure only the radial component of surface velocity; consequently, at least two antennas are necessary for the measurement of current fields (Barrick and Lipa 1986). Exhaustive reviews on HF radar principles and functioning can be found in Paduan and Graber (1997) and Teague et al (1997).…”

Section: Hf Radar Networkmentioning

confidence: 99%

Multiplatform observation of the surface circulation in the Gulf of Naples (Southern Tyrrhenian Sea)

et al. 2011

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The Gulf of Naples (Southern Tyrrhenian Sea) is a highly urbanised area, where human activities and natural factors (e.g. river runoff, exchanges with adjacent basins) can strongly affect the water quality. In this work we show how surface transport can influence the distribution of passively drifting surface matter, and more in general if and how the circulation in the basin can promote the renovation of the surface layer. To this aim, we carried out a multiplatform analysis by putting together HF radar current fields, satellite images and modelling tools. Surface current fields and satellite images of turbidity patterns were used to initialise and run model simulations of particle transport and diffusion. Model results were then examined in relation to the corresponding satellite distributions. This integrated approach permits to investigate the concurrent effects of surface dynamics and wind forcing in determining the distribution of passive tracers over the basin of interest, identifying key mechanisms supporting or preventing the renewal of surface waters as well as possible areas of aggregation and retention.

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HF Radar Instruments, Past to Present

Cited by 53 publications

References 26 publications

Dynamics and sea state in the Gulf of Naples: potential use of high-frequency radar data in an operational oceanographic context

Dynamics and sea state in the Gulf of Naples: potential use of high-frequency radar data in an operational oceanographic context

Evaluation of two algorithms for a network of coastal HF radars in the Mid-Atlantic Bight

Multiplatform observation of the surface circulation in the Gulf of Naples (Southern Tyrrhenian Sea)

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