Temporal and spatial resolution of HF ocean radars

Heron, Malcom L., and Atwater, Daniel P. (2013) Temporal and spatial resolution of HF ocean radars. Ocean Science Journal, 48 (1). pp. 99-103.

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Abstract

The spatial and temporal resolutions of the two main types of HF radar are compared, with reference to the phased array and the crossed-loop direction-finding systems which make up the Australian Coastal Ocean radar Network. Both genres use a swept frequency "chirp" modulation to define the range of a pixel being observed but the method for determining the azimuth direction of the pixel is a strong point of differentiation. The phased-array systems produce independent maps of surface currents in about 1/7 of the time for the crossed-loop systems because of contrasting noise performance of the antennas. The use of beam-forming analysis in the phased-arrays is shown to give spatial resolutions, for vector currents, of about 10 km close to the shore, and 25 km at ranges of 150 km. The corresponding vector current spatial resolutions for the crossed-loop systems are 40 km and 60 km respectively.

Item ID: 31095
Item Type: Article (Research - C1)
ISSN: 2005-7172
Keywords: HF ocean radar, spatial resolution, temporal resolution, surface current maps, phased-array, crossed-loop
Date Deposited: 05 Feb 2014 01:23
FoR Codes: 04 EARTH SCIENCES > 0405 Oceanography > 040503 Physical Oceanography @ 50%
09 ENGINEERING > 0911 Maritime Engineering > 091103 Ocean Engineering @ 50%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 33%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961104 Physical and Chemical Conditions of Water in Marine Environments @ 33%
97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 34%
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