Radar propagation in coastal environments: Vampira results

Essen, H.; Fuchs, H.-H.; Pagels, A.

doi:10.1117/12.693498

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Lots of pages of scientific research about the local boundary layer conditions have been published until now. [3][4][5] In Europe and South Asia, the ducting conditions over the Baltic Sea, [6,7] the English Channel, [8,9] the Mediterranean region, [10] and the Indian Ocean [11] have been reported. As for China, lots of investigations have been made on the ducting conditions over the East China Sea and South China Sea during the last two decades.…”

Section: Introductionmentioning

confidence: 99%

Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

Sun¹,

Ning²,

Tang³

et al. 2016

Chinese Phys. B

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Atmospheric duct is a common phenomenon over large bodies of water, and it can significantly affect the performance of many radio systems. In this paper, a two-month (in July and August, 2014) sounding experiment in ducting conditions over Bosten Lake was carried out at a littoral station (41.89 • N, 87.22 • E) with high resolution GPS radiosondes, and atmospheric ducts were observed for the first time in this area. During the two months, surface and surface-based ducts occurred frequently over the Lake. Strong diurnal variations in ducting characteristics were noticed in clear days. Ducting occurrence was found at its lowest in the early morning and at its highest (nearly 100%) in the afternoon. Duct strength was found increasing from early morning to forenoon, and reaching its maximum in the afternoon. But contrarily, duct altitude experienced a decrease in a clear day. Then the meteorological reasons for the variations were discussed in detail, turbulent bursting was a possible reason for the duct formation in the early morning and the prevailing lake-breeze front was the main reason in the afternoon. The propagation of electromagnetic wave in a ducting environment was also investigated. A raytracing framework based on Runge-Kutta method was proposed to assess the performance of radio systems, and the precise critical angle and grazing angle derived from the ray-tracing equations were provided. Finally, numerical investigations on the radar performance in the observed ducting environments have been carried out with high accuracy, which demonstrated that atmospheric ducts had made great impacts on the performance of radio systems. The range/height errors for radar measurement induced by refraction have also been presented, too, which shows that the height errors were very large for trapped rays when the total range was long enough.

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Section: Introductionmentioning

confidence: 99%

Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

Sun¹,

Ning²,

Tang³

et al. 2016

Chinese Phys. B

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The Tropical Air–Sea Propagation Study (TAPS)

Kulessa

Barrios

Claverie

et al. 2017

Bulletin of the American Meteorological Society

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The purpose of the Tropical Air–Sea Propagation Study (TAPS), which was conducted during November–December 2013, was to gather coordinated atmospheric and radio frequency (RF) data, offshore of northeastern Australia, in order to address the question of how well radio wave propagation can be predicted in a clear-air, tropical, littoral maritime environment. Spatiotemporal variations in vertical gradients of the conserved thermodynamic variables found in surface layers, mixing layers, and entrainment layers have the potential to bend or refract RF energy in directions that can either enhance or limit the intended function of an RF system. TAPS facilitated the collaboration of scientists and technologists from the United Kingdom, the United States, France, New Zealand, and Australia, bringing together expertise in boundary layer meteorology, mesoscale numerical weather prediction (NWP), and RF propagation. The focus of the study was on investigating for the first time in a tropical, littoral environment the i) refractivity structure in the marine and coastal inland boundary layers; ii) the spatial and temporal behavior of momentum, heat, and moisture fluxes; and iii) the ability of propagation models seeded with refractive index functions derived from blended NWP and surface-layer models to predict the propagation of radio wave signals of ultrahigh frequency (UHF; 300 MHz–3 GHz), super-high frequency (SHF; 3–30 GHz), and extremely high frequency (EHF; 30–300 GHz). Coordinated atmospheric and RF measurements were made using a small research aircraft, slow-ascent radiosondes, lidar, flux towers, a kitesonde, and land-based transmitters. The use of a ship as an RF-receiving platform facilitated variable-range RF links extending to distances of 80 km from the mainland. Four high-resolution NWP forecasting systems were employed to characterize environmental variability. This paper provides an overview of the TAPS experimental design and field campaign, including a description of the unique data that were collected, preliminary findings, and the envisaged interpretation of the results.

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Radar propagation in coastal environments: Vampira results

Cited by 2 publications

References 2 publications

Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

Anomalous propagation conditions of electromagnetic wave observed over Bosten Lake, China in July and August, 2014

The Tropical Air–Sea Propagation Study (TAPS)

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