Validation of a worldwide physics-based, high spectral resolution atmospheric characterization and propagation package for UV to RF wavelengths

Fiorino, Steven T.; Bartell, Richard J.; Krizo, Matthew J.; Moore, Kenneth P.; Cusumano, Salvatore J.

doi:10.1117/12.795435

Cited by 10 publications

(25 citation statements)

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“…HELEEOS has been validated in the UV to RF wavelengths. 6 HELEEOS employs the Scaling for High Energy Laser and Relay Engagement MATLAB toolbox to perform the laser propagation and optics code through the atmosphere. 7…”

Section: Heleeosmentioning

confidence: 99%

Capturing atmospheric effects on 3D millimeter wave radar propagation patterns

Cook¹,

Fiorino²,

Keefer

et al. 2016

SPIE Proceedings

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Traditional radar propagation modeling is done using a path transmittance with little to no input for weather and atmospheric conditions. As radar advances into the millimeter wave (MMW) regime, atmospheric effects such as attenuation and refraction become more pronounced than at traditional radar wavelengths. The DoD High Energy Laser Joint Technology Offices High Energy Laser End-to-End Operational Simulation (HELEEOS) in combination with the Laser Environmental Effects Definition and Reference (LEEDR) code have shown great promise simulating atmospheric effects on laser propagation. Indeed, the LEEDR radiative transfer code has been validated in the UV through RF. Our research attempts to apply these models to characterize the far field radar pattern in three dimensions as a signal propagates from an antenna towards a point in space. Furthermore, we do so using realistic three dimensional atmospheric profiles. The results from these simulations are compared to those from traditional radar propagation software packages. In summary, a fast running method has been investigated which can be incorporated into computational models to enhance understanding and prediction of MMW propagation through various atmospheric and weather conditions.

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Section: Heleeosmentioning

confidence: 99%

Capturing atmospheric effects on 3D millimeter wave radar propagation patterns

Cook¹,

Fiorino²,

Keefer

et al. 2016

SPIE Proceedings

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“…A number of tools are available for evaluating atmospheric propagation loss. The tool used for this project is the Laser Environmental Effects Definition and Reference (LEEDR) [5,6] model developed at the Air Force Institute of Technology (AFIT). LEEDR can be used to model atmospheric attenuation effect from optical to microwave wavelengths.…”

Section: Design Considerationsmentioning

confidence: 99%

A Near-Millimeter Wave interferometric radar

Fritz

Scally

Gasiewski

2013

2013 IEEE Radar Conference (RadarCon13)

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Due to the paucity of high-power sources along with strong electromagnetic absorption by water vapor at frequencies between ~100 GHz and ~10 THz, there are very few radar systems operating in the terahertz range of the spectrum. Source technology, however, is improving, thus facilitating radar systems operating in this gap. The Near-Millimeter Wave (NMMW) range typically refers to frequencies from 100 to 1000 GHz, or, wavelengths straddling the transition from millimeter to sub-millimeter (3 mm to 300 m). At the lower end of this range where components are more readily available and atmospheric attenuation is moderate an interferometric radar system for imaging surfaces up to several hundred meters has been designed and is being built. By scanning a fan beam and receiving at two displaced locations, three dimensional images of the surface topography (in range, azimuth and height) can be generated. This paper describes the design considerations for this radar and the prototype system.

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“…LEEDR modifies the lower portion of the Hufnagel-Valley (HV) profile to account for the change in turbulence strength as the surface temperature increases. This modification is based on the McClung-Tunick model developed by the Air Force Institute of Technology, 25,26 which more accurately accounts for turbulence in the first 50 m above the surface. Above 50 m, the turbulence profile blends with the Hufnegel-Valley 5∕7 profile.…”

Section: Description Of Atmospheric Conditionsmentioning

confidence: 99%

Comparison of coherent and incoherent laser beam combination for tactical engagements

et al. 2012

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Abstract. The performance of a multibeam laser system is evaluated for coherent and incoherent beam combination under tactical scenarios. For direct comparison, identical aperture geometries are used for both, coherent or incoherent, combination methods. The analysis assumes a multilaser source coupled with a conventional 0.32 m diameter, on-axis, beam director. Parametric analysis includes variations over residual errors, beam quality, atmospheric effects, and scenario geometry. Analytical solutions from previous results are used to evaluate performance for the vacuum case, providing an upper bound on performance and a backdrop for organizing the multitude of effects as they are analyzed. Wave optics simulations are used for total system performance. Each laser in the array has a wavelength of 1.07 μm, 10 kW (25 kW) output power, and Gaussian exitance profile. Both tracking and full-aperture adaptive optics are modeled. Three tactical engagement geometries, air to surface, surface to air, and surface to surface, are evaluated for slant ranges from 2.5 to 10 km. Two near-median atmospheric profiles were selected based upon worldwide climatological data. The performance metric used is beam propagation efficiency for circular target diameters of 5 and 10 cm. © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Validation of a worldwide physics-based, high spectral resolution atmospheric characterization and propagation package for UV to RF wavelengths

Cited by 10 publications

References 0 publications

Capturing atmospheric effects on 3D millimeter wave radar propagation patterns

Capturing atmospheric effects on 3D millimeter wave radar propagation patterns

A Near-Millimeter Wave interferometric radar

Comparison of coherent and incoherent laser beam combination for tactical engagements

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