Evolution of the SuperDARN antenna: twin terminated folded dipole antenna for HF systems

Čustović, Edhem; Nguyen, Hoang; Devlin, John; Whittington, J.; Elton, Darrell; Console, Adam; Ye, H.; Greenwald, R. A.; André, D.; Parsons, Matt

doi:10.1109/ib2com.2011.6217936

Cited by 10 publications

(13 citation statements)

References 3 publications

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“…First, we confirm that the minimum slant range for each frequency observed in power versus range profiles does indeed correspond to the slant range to the skip distance. Detailed modeling of the gain pattern of SuperDARN antennas [ Milan et al , ; Custovic et al , ] indicates that the radar is capable of detecting signals at elevation angles greater than those associated with the skip distance. This is evident in Figure , which shows 6 h histograms of elevation angle data from the Saskatoon SuperDARN radar centered around local noon (09:00–15:00 local time), for three different frequencies.…”

Section: Discussionmentioning

confidence: 99%

Determination of ionospheric parameters in real time using SuperDARN HF Radars

et al. 2014

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A technique for determining key ionospheric parameters from high-frequency (HF) over-the-horizon radar ground scatter data is investigated using two Southern Hemisphere SuperDARN radars and also a Northern Hemisphere SuperDARN radar with reliable elevation angle-of-arrival capability. Ground scatter data are analyzed over a range of frequencies from 8 to 18 MHz to determine the maximum usable frequency and the vertical critical frequency over a wide geographical area within the radar field of view. The technique is shown to be well suited to middle to high latitudes where backscatter echoes from the ground dominate over those from ionospheric scattering targets. However, the technique is shown to break down during the winter months and away from solar maximum. It is shown that the use of reliable elevation angles can greatly enhance such methods allowing discrimination between ground scatter propagating via the E and F regions. It is also shown that contamination from very low velocity ionospheric scatter and ground scatter originating from the back lobe of the radar can be effectively filtered out, with the use of reliable elevation angles. This greatly improves the reliability of the ionospheric data products and allows for a high degree of automation of the process.

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Section: Discussionmentioning

confidence: 99%

Determination of ionospheric parameters in real time using SuperDARN HF Radars

et al. 2014

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“…The front‐to‐back ratio has been identified as a likely limitation that HF antennas operating in the east‐west azimuths will have, which needs to be considered in the design of the antenna's elevation radiation pattern, height, and separation. This would entail constructing an antenna with a large front‐to‐back ratio to allow for distinguishing scatter from east and west azimuths, which is crucial for a SuperDARN measurement (Custovic et al, , ).…”

Section: Discussionmentioning

confidence: 99%

A Ray Tracing Simulation of HF Ionospheric Radar Performance at African Equatorial Latitudes

et al. 2020

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High‐frequency (HF) coherent radars are widely applied for studying electrodynamic processes in the Earth's upper atmosphere and ionosphere. Super Dual Auroral Radar Network (SuperDARN) is an international network of such radars located at high‐ and middle‐latitude regions in the Northern and Southern Hemispheres. 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 the African equatorial sector. We use a number of realistic average ionospheres deduced from the International Reference Ionosphere (IRI) 2012 model and magnetic field geometries from the International Geomagnetic Reference Field (IGRF) to determine likely propagation paths and orthogonality conditions for such radar systems. The east‐west azimuth ( ∼25° range) has a significant likelihood of achieving a SuperDARN‐type backscatter in the African equatorial sector, mainly due to the prevailing magnetic field geometry. This analysis provides a feasibility study for developing a SuperDARN‐like radar for studying the equatorial ionosphere over the African longitude sector, for example, in determining the technical radar characteristics such as preferable operating frequencies, antenna boresight orientation, and azimuth coverage and provides a simulation of the expected localization of radar backscatter as a function of radar location and beam direction, as well as the time of day, season, and sunspot number.

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“…From [15] the design goal is to maximise the intrinsic 3 dB bandwidth of the radiating element, which is to be improved using a passive matching network. An example at HF is the twin-terminated folded dipole antennas developed for the SuperDARN space weather radar network which make use of an optimised N th order LC matching network [20]. An alternative broadband antenna design commonly used in GPR is the resistively-loaded dipole antenna [21], [22].…”

Section: Broadband Hf/vhf Antennasmentioning

confidence: 99%

HF Wire-Mesh Dipole Antennas for Broadband Ice-Penetrating Radar

Hawkins¹,

Lok²,

Brennan³

et al. 2020

Antennas Wirel. Propag. Lett.

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A novel high frequency (HF) to very high frequency (VHF) wire-mesh dipole antenna design for use in polar regions is discussed and evaluated. The antenna was designed to be lightweight, readily demountable, and acceptably robust. This is an initial step in the development of a ground-based, phasesensitive, synthetic aperture imaging system for use on an autonomous rover platform. The results of initial trials on the Rhône Glacier, Switzerland in August 2019 are discussed, with particular attention being paid to the effect on antenna performance of high surface water content. Including the effects of surface water resulted in good agreement between field results and modelled performance.

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Evolution of the SuperDARN antenna: twin terminated folded dipole antenna for HF systems

Cited by 10 publications

References 3 publications

Determination of ionospheric parameters in real time using SuperDARN HF Radars

Determination of ionospheric parameters in real time using SuperDARN HF Radars

A Ray Tracing Simulation of HF Ionospheric Radar Performance at African Equatorial Latitudes

HF Wire-Mesh Dipole Antennas for Broadband Ice-Penetrating Radar

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