Accuracy assessment of high frequency radar current measurements in the Strait of Gibraltar

Lorente, Pablo; Soto‐Navarro, Javier; Fanjul, E. Alvarez; Piedracoba, Sílvia

doi:10.1080/1755876x.2014.11020300

Cited by 37 publications

(34 citation statements)

References 23 publications

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“…Some finetuning, according to the specific local conditions of the system, is thus required to have the right trade-off between confirmed outlier identification and false alarm rate (Gómez et al, 2014). A number of previous works have focused on defining optimum threshold levels (e.g., Lorente et al, 2014Lorente et al, , 2015a but there is still no worldwide consensus. Current initiatives intend to use non-velocity-based metrics related to the characteristics of the received signal (radial and total coverage analysis, hardware status, quality of the received signal) in order to implement advanced quality controls (Kirincich et al, 2012).…”

Section: Basic Principles Of Hfr Operation and Data Specificationsmentioning

confidence: 99%

“…These errors (GDOP and GDOSA) are distributed spatially and can be controlled and estimated in the processing from total to radials Barrick, 2002). Related to the data uncertainties, it is worth mentioning that a number of validation exercises exist, based on comparisons of HFR currents against independent in situ measurements (Kohut and Glenn, 2003;Kaplan et al, 2005;Paduan et al, 2006;Ohlmann et al, 2007;Cosoli et al, 2010;Lorente et al, 2014Lorente et al, , 2015aSolabarrieta et al, 2014;Kalampokis et al, 2016). These validation exercises can be limited by the fact that part of the discrepancies observed through these comparisons are due to the specificities and own inaccuracies of the different measuring systems (Solabarrieta et al, 2014;Kalampokis et al, 2016).…”

Section: Basic Principles Of Hfr Operation and Data Specificationsmentioning

confidence: 99%

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HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network

et al. 2017

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High Frequency Radar (HFR) is a land-based remote sensing instrument offering a unique insight to coastal ocean variability, by providing synoptic, high frequency and high resolution data at the ocean atmosphere interface. HFRs have become invaluable tools in the field of operational oceanography for measuring surface currents, waves and winds, with direct applications in different sectors and an unprecedented potential for the integrated management of the coastal zone. In Europe, the number of HFR networks has been showing a significant growth over the past 10 years, with over 50 HFRs currently deployed and a number in the planning stage. There is also a growing literature concerning the use of this technology in research and operational oceanography. A big effort is made in Europe toward a coordinated development of coastal HFR technology and its products within the framework of different European and international initiatives. One recent initiative has been to make an up-to-date inventory of the existing HFR operational systems in Europe, describing the characteristics of the systems, their operational products and applications. This paper offers a comprehensive review on the present status of European HFR network, and discusses the next steps toward the integration of HFR platforms as operational components of the European Ocean Observing System, designed to align and integrate Europe's ocean observing capacity for a truly integrated end-to-end observing system for the European coasts.

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Section: Basic Principles Of Hfr Operation and Data Specificationsmentioning

confidence: 99%

Section: Basic Principles Of Hfr Operation and Data Specificationsmentioning

confidence: 99%

HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network

et al. 2017

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“…Comparison with the global OOFS (within which the IBI OOFS is nested) quantifies added value of the regional shelf system (Figure 7), that representing tides and highfrequency upper ocean dynamics. There are also comparisons against coastal systems over key areas, such as the SAMPA (Sistema Autónomo de Medición, Predicción y Alerta) system around the Gibraltar Strait (Lorente et al 2014).…”

Section: Development Of Integrated Operational Verification Systemsmentioning

confidence: 99%

Recent progress in performance evaluations and near real-time assessment of operational ocean products

Hernández

Blockley

Brassington

et al. 2015

Journal of Operational Oceanography

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“…Furthermore, Atwater and Heron [28] suggested that the errors in radar-measured surface currents were insensitive to the measured and ideal antenna patterns. In addition, some other studies suggest that in some cases the current velocities extracted by the ideal antenna pattern show a better reliability than those extracted by the actual antenna pattern [26,29,30]. Therefore, using the ideal antenna pattern to retrieve the current mappings in direction-finding radar remains an indispensable technique, which is still widely used today.…”

Section: Introductionmentioning

confidence: 99%

Quantifying and Reducing the DOA Estimation Error Resulting from Antenna Pattern Deviation for Direction-Finding HF Radar

et al. 2017

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High-frequency (HF) radars are routinely used for remotely sensing ocean surface currents. However, the performance of the most widely used direction-finding HF radar is degraded due to the effect of the inevitable deviations of actual antenna pattern on the direction of arrival (DOA) estimation. In this paper, we quantify the DOA estimation error resulting from the deviation of the actual antenna pattern from the ideal one. Theoretical analysis and field experiment results suggest that the ratio of the deviations for the two loops dominates the DOA estimation error. Thus, eliminating the effect of the antenna pattern deviations on DOA estimation error is transformed into eliminating the effect of this ratio. From this, a calibration method based on the time-averaged local spatial coverage rate (TLSCR) is proposed to reduce the effect of the antenna pattern deviations on current extraction, which uses the ideal antenna pattern to estimate the DOA of the echoes. To validate this proposed calibration method, we assess the radar-derived radial velocities by comparing with in situ observations. The comparison results indicate that the proposed TLSCR calibration method can effectively reduce the DOA estimation error and improve the performance of the direction-finding HF radar in current observation.

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Accuracy assessment of high frequency radar current measurements in the Strait of Gibraltar

Cited by 37 publications

References 23 publications

HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network

HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network

Recent progress in performance evaluations and near real-time assessment of operational ocean products

Quantifying and Reducing the DOA Estimation Error Resulting from Antenna Pattern Deviation for Direction-Finding HF Radar

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