A General Presentation About the OTH-Radar NOSTRADAMUS

Bazin, Valérie; Molinié, Jean-Philippe; Munoz, Juan Manuel Cuerda; Dorey, P.; Saillant, Stéphane; Auffray, G.; Rannou, V.; Lesturgie, Marc

doi:10.1109/radar.2006.1631867

Cited by 26 publications

(12 citation statements)

References 1 publication

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“…The original 2002 paper covered two such OTH systems: the U.S. Air Force OTH-B system, currently in an inactive but ready state, and the U.S. Navy Relocatable OTH Radar. Other OTH systems in use include the French Nostradamus system [52], [53] and the Jindalee OTH system in Australia [54], [55]. OTH radar systems typically use large phased arrays of monopoles or dipoles that can extend over several kilometers.…”

Section: Over-the-horizon Radarmentioning

confidence: 99%

Advancements at the Lower End: Advances in HF, VHF, and UHF Systems and Technology

Caverly

Breed²,

Cantrell

et al. 2015

IEEE Microwave

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Section: Over-the-horizon Radarmentioning

confidence: 99%

Advancements at the Lower End: Advances in HF, VHF, and UHF Systems and Technology

Caverly

Breed²,

Cantrell

et al. 2015

IEEE Microwave

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“…The developed methodology will be tested using a set of synthetic benchmark tests (section 3) and will be applied to real data from the OTH radar Nostradamus (New Transhorizon Decametric System Applying Studio Methods) [Bazin et al, 2006] in section 4.…”

Section: Roy Et Almentioning

confidence: 99%

“…• and in the frequency range 6-16 MHz, as this is the operating capacity of the Nostradamus OTH radar [Bazin et al, 2006]. The background ionosphere covering an area of 2500 km in distance and reaching up to 400 km altitude.…”

Section: Quantitatively We Simulate Rays With Elevation Angles Betwementioning

confidence: 99%

Effect of ray and speed perturbations on ionospheric tomography by over‐the‐horizon radar: A new method

et al. 2014

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Most recent methods in ionospheric tomography are based on the inversion of the total electron content measured by ground-based GPS receivers. As a consequence of the high frequency of the GPS signal and the absence of horizontal raypaths, the electron density structure is mainly reconstructed in the F2 region (300 km), where the ionosphere reaches the maximum of ionization, and is not sensitive to the lower ionospheric structure. We propose here a new tomographic method of the lower ionosphere, based on the full inversion of over-the-horizon (OTH) radar data. Previous studies using OTH radar for ionospheric tomography inverted only the leading edge echo curve of backscatter ionograms. The major advantage of our methodology is taking into account, numerically and jointly, the effect that the electron density perturbations induce not only in the speed of electromagnetic waves but also on the raypath geometry. This last point is extremely critical for OTH radar inversions as the emitted signal propagates through the ionosphere between a fixed starting point (the radar) and an unknown end point on the Earth surface where the signal is backscattered. We detail our ionospheric tomography method with the aid of benchmark tests. Having proved the necessity to take into account both effects simultaneously, we apply our method to real data. This is the first time that the effect of the raypath deflection has been quantified and that the ionospheric plasma density has been estimated over the entirety of Europe with an OTH radar.

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“…The other is obtained by scanning in frequency because the available radars are not able to scan in elevation [Coleman, 1997]. For the former type, Roy et al [2014] recently developed an ionospheric tomography method based on elevation scan data of the over-the-horizon radar Nostradamus [Bazin et al, 2006], which took into account the whole information of the radar measurement. This novel method indicated that electron density perturbations could affect the raypath geometry and consequently influence the inversion results.…”

Section: Introductionmentioning

confidence: 99%

Comparisons of ionospheric electron density distributions reconstructed by GPS computerized tomography, backscatter ionograms, and vertical ionograms

Zhou

Yong

et al. 2015

JGR Space Physics

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Global Positioning System (GPS) computerized ionosphere tomography (CIT) and ionospheric sky wave ground backscatter radar are both capable of measuring the large‐scale, two‐dimensional (2‐D) distributions of ionospheric electron density (IED). Here we report the spatial and temporal electron density results obtained by GPS CIT and backscatter ionogram (BSI) inversion for three individual experiments. Both the GPS CIT and BSI inversion techniques demonstrate the capability and the consistency of reconstructing large‐scale IED distributions. To validate the results, electron density profiles obtained from GPS CIT and BSI inversion are quantitatively compared to the vertical ionosonde data, which clearly manifests that both methods output accurate information of ionopsheric electron density and thereby provide reliable approaches to ionospheric soundings. Our study can improve current understanding of the capability and insufficiency of these two methods on the large‐scale IED reconstruction.

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A General Presentation About the OTH-Radar NOSTRADAMUS

Cited by 26 publications

References 1 publication

Advancements at the Lower End: Advances in HF, VHF, and UHF Systems and Technology

Advancements at the Lower End: Advances in HF, VHF, and UHF Systems and Technology

Effect of ray and speed perturbations on ionospheric tomography by over‐the‐horizon radar: A new method

Comparisons of ionospheric electron density distributions reconstructed by GPS computerized tomography, backscatter ionograms, and vertical ionograms

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