Performance Evaluation of SeaSonde High-Frequency Radar for Vessel Detection

2011 ◽  
Vol 45 (3) ◽  
pp. 14-24 ◽  
Author(s):  
Hugh J. Roarty ◽  
Erick Rivera Lemus ◽  
Ethan Handel ◽  
Scott M. Glenn ◽  
Donald E. Barrick ◽  
...  
Keyword(s):  
High Frequency ◽  
Processing Parameters ◽  
Hf Radar ◽  
High Frequency Radar ◽  
Detection And Tracking ◽  
Surface Vessels ◽  
Wave Radar ◽  
Vessel Detection ◽  
Track Surface ◽  
Maritime Domain Awareness

AbstractHigh-frequency (HF) surface wave radar has been identified to be a gap-filling technology for Maritime Domain Awareness. Present SeaSonde HF radars have been designed to map surface currents but are able to track surface vessels in a dual-use mode. Rutgers and CODAR Ocean Sensors, Ltd., have collaborated on the development of vessel detection and tracking capabilities from compact HF radars, demonstrating that ships can be detected and tracked by multistatic HF radar in a multiship environment while simultaneously mapping ocean currents. Furthermore, the same vessel is seen simultaneously by the radar based on different processing parameters, mitigating the need to preselect a fixed set and thereby improving detection performance.

Target detection and tracking with a high frequency ground wave radar

1994 ◽  
Vol 19 (4) ◽  
pp. 540-548 ◽  
Author(s):  
R. Khan ◽  
B. Gamberg ◽  
D. Power ◽  
J. Walsh ◽  
B. Dawe ◽  
...  
Keyword(s):  
Target Detection ◽  
High Frequency ◽  
Detection And Tracking ◽  
Wave Radar ◽  
Ground Wave

scholarly journals Estimation of currents using SARAL/AltiKa in the coastal regions of India

2014 ◽  
Vol XL-8 ◽  
pp. 1365-1367
Author(s):  
A. Chaudhary ◽  
N. Agarwal ◽  
R. Sharma
Keyword(s):  
High Frequency ◽  
Coastal Region ◽  
Hf Radar ◽  
Altimeter Data ◽  
Surface Currents ◽  
Radar Observations ◽  
Geostrophic Currents ◽  
The Moment ◽  
Track Surface ◽  
Along Track

The present study explores the possibility of deriving the across track currents along the Indian coastal region from SARAL/AltiKa mission. The across track surface geostrophic currents obtained from along track SARAL altimeter data are directly compared (qualitatively) with high frequency (HF) radar observations of surface currents in the Bay of Bengal. The velocity component from HF radar which is perpendicular to the altimeter tracks is considered. Since the ageostrophic velocity contribution is ignored for the moment, the surface geostrophic currents SARAL compare well only under low wind conditions. Due to high along track resolution of SARAL there are large variations in velocity which are not captured by the HF radar observations. In general, the magnitude and variations in surface currents derived from SARAL altimeter are comparable with HF radar observations.

Lagrangian dynamics in the Gulf of Trieste from high resolution HF-Radar

2020 ◽  
Author(s):  
Nydia Catalina Reyes-Suarez ◽  
Ismael Hernandez-Carrasco ◽  
Matjaz Licer ◽  
Vanessa Cardin ◽  
Miroslav Gacic ◽  
...  
Keyword(s):  
High Frequency ◽  
Oil Spills ◽  
Hf Radar ◽  
Time Data ◽  
High Frequency Radar ◽  
Gulf Of Trieste ◽  
Radar Network ◽  
Marine Traffic ◽  
Surface Variability ◽  
Lagrangian Descriptors

<p>The Gulf of Trieste (GoT) is shared by Italy, Slovenia and Croatia, with most of its coasts belonging to Italy and Slovenia, along with the two main harbours; the Harbour of Trieste (Italy) and Koper (Slovenia). Both are subject to heavy marine traffic and exposed to different threats including oil spills, maritime accidents and SAR operations. The GOT High frequency radar network provides near-real time data of sea surface currents and waves since 2016. In this work we provide a statistical description of surface variability in terms of Lagrangian descriptors in order to elucidate the transport and retention in the GoT as well as to provide the seasonal evolution of the residence time. Among the most widely used Lagrangian techniques, we focus the study on Lagrangian Coherent Structures and Path-integrated topological variables like Lagrangian divergence and Lagrangian vorticity. </p>

scholarly journals Observation of Zenneck-Like Waves over a Metasurface Designed for Launching HF Radar Surface Wave

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Florent Jangal ◽  
Nicolas Bourey ◽  
Muriel Darces ◽  
François Issac ◽  
Marc Hélier
Keyword(s):  
Surface Wave ◽  
High Frequency ◽  
Dielectric Medium ◽  
Hf Radar ◽  
Dielectric Slab ◽  
High Frequency Band ◽  
High Attenuation ◽  
Wave Radar ◽  
Infrared Method ◽  
Constant Interest

Since the beginning of the 20th century a controversy has been continuously revived about the existence of the Zenneck Wave. This wave is a theoretical solution of Maxwell’s equations and might be propagated along the interface between the air and a dielectric medium. The expected weak attenuation at large distance explains the constant interest for this wave. Notably in the High Frequency band such a wave had been thought as a key point to reduce the high attenuation observed in High Frequency Surface Wave Radar. Despite many works on that topic and various experiments attempted during one century, there is still an alternation of statements between its existence and its nonexistence. We report here an experiment done during the optimisation of the transmitting antennas for Surface Wave Radars. Using an infrared method, we visualize a wave having the structure described by Zenneck above a metasurface located on a dielectric slab.

scholarly journals Research on Polarization Cancellation of Nonstationary Ionosphere Clutter in HF Radar System

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Xingpeng Mao ◽  
Hong Hong ◽  
Weibo Deng ◽  
Yongtan Liu
Keyword(s):  
Surface Wave ◽  
Time Domain ◽  
High Frequency ◽  
Interference Cancellation ◽  
Radar System ◽  
Experimental Results ◽  
Hf Radar ◽  
Oblique Projection ◽  
Polarization Filter ◽  
Wave Radar

Oblique projection polarization filter (OPPF) can be applied as an effective approach for interference cancellation in high-frequency surface wave radar (HFSWR) and other systems. In order to suppress the nonstationary ionosphere clutter further, a novel OPPF based clutter suppressing scheme is proposed in this paper. The polarization and nonstationary characteristic of the clutter are taken into account in the algorithms referred to as range-Doppler domain polarization suppression (RDDPS) and the range-time domain polarization suppression (RTDPS) method, respectively. The RDDPS is designed for weak ionosphere clutter and implemented in the range-Doppler domain directly, whereas the RTDPS algorithm is designed to suppress the powerful ionosphere clutter with a multisegment estimation and suppression scheme. About 15–23 dB signal to interference ratio (SIR) improvement can be excepted when using the proposed method, whereas the targets can be more easily detected in the range-Doppler map. Experimental results demonstrate that the scheme proposed is effective for nonstationary ionosphere clutter and is proven to be a practical interference cancellation technique for HFSWR.

scholarly journals A Preliminary Study of Wave Energy Resource Using an HF Marine Radar, Application to an Eastern Southern Pacific Location: Advantages and Opportunities

2021 ◽  
Vol 13 (2) ◽  
pp. 203
Author(s):  
Valeria Mundaca-Moraga ◽  
Rodrigo Abarca-del-Rio ◽  
Dante Figueroa ◽  
James Morales
Keyword(s):  
High Resolution ◽  
Wave Energy ◽  
High Frequency ◽  
Numerical Models ◽  
Energy Resource ◽  
Hf Radar ◽  
Wave Power ◽  
High Concentration ◽  
Wave Radar ◽  
Temporal And Spatial

As climate change is of global concern, the electric generation through fossil fuel is progressively shifted to renewable energies. Among the renewables, the most common solar and wind, the wave energy stands for its high-power density. Studies about wave energy resource have been increasing over the years, especially in coastal countries. Several research investigations have assessed the global wave power, with higher values at high latitudes. However, to have a precise assessment of this resource, the measurement systems need to provide a high temporal and spatial resolution, and due to the lack of in-situ measurements, the way to estimate this value is numerical. Here, we use a high-frequency radar to estimate the wave energy resource in a nearshore central Chile at a high resolution. The study focuses near Concepción city (36.5° S), using a WERA (WavE RAdar) high frequency (HF) radar. The amount of annual energy collected is calculated. Analysis of coefficient of variation (COV), seasonal variability (SV), and monthly variability (MV) shows the area's suitability for installing a wave energy converter device due to a relatively low variability and the high concentration of wave power obtained. The utility of HF radars in energy terms relies on its high resolution, both temporal and spatial. It can then compare the location of interest within small areas and use them as a complement to satellite measurements or numerical models, demonstrating its versatility.

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