Investigation of the influence of optical turbulence on DIRCM laser’s jamming effectiveness: A wave-optics approach

Yasa, Utku Görkem; Bozat, Özgür; Figen, Ziya Gürkan; Bozbulut, Ali Rıza

doi:10.1016/j.infrared.2021.103728

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…Dept. of TÜBİTAK BİLGEM/İLTAREN for two-dimensional beam propagation in turbulent media (atmosphere and/or exhaust plume of an air platform) 8,9 . Each dataset were modeled in two separate waveoptics-based simulation models, one of which considers temporal dynamics of turbulent atmosphere while the other ignores temporal evolution of turbulence by producing uncorrelated beam frames.…”

Section: Simulation Toolmentioning

confidence: 99%

Measuring and modeling the influence of atmospheric turbulence on a 2-µm laser beam

Yasa,

Keskin,

Figen

et al. 2023

Environmental Effects on Light Propagation and Adaptive Systems VI

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Within the scope of NATO SET-304 research task group, a field trial was conducted in October/2022 at the ONERA campus located in Le Fauga, Toulouse, France. Part of this trial was devoted to the study of the influence of atmospheric turbulence on laser beam propagation. In this paper, measurement results obtained during the trial for a laser beam degraded by optical turbulence are presented along with the results of analytical expressions and a numerical model. The beam of a 50-Hz pulsed 2-µm laser source (owned and operated by FFI, Norway) was focused on a target screen located approximately 1 km away from the laser emitter. Throughout the trial under various atmospheric turbulence strengths (𝐶 𝑛 2 varying between 5×10 -16 m -2/3 and 3×10 -13 m -2/3 ), the scattered laser radiation was captured with an infrared camera (owned and operated by TÜBİTAK BİLGEM/İLTAREN, Türkiye) looking at the nearby target screen in an oblique direction. Also, at different times of the trial, a point receiver setup consisting of two photo-diodes was positioned in the propagation path to directly capture intensity fluctuations of the laser beam for further investigation of the turbulence effects. The infrared camera was triggered by a 100-Hz trigger signal that enabled successive recordings of the laser beam profiles and instantaneous background. Several post-processing techniques (background subtraction, 2X soft aperture etc.) are performed on the recordings to correctly evaluate the effect of atmospheric turbulence on laser beams such as beam spreading, wandering, and degradation. Calculated beam metrics such as short-and long-term beam radii and beam wander variance are compared with the results obtained from analytical expressions and it is observed that measurement results match well with theoretical expectations. Furthermore, propagation scenarios encountered in the trial are simulated using a wave-optics-based split-step phase screen model with/without considering temporal dynamics. Numerical model results also show good agreement with the measurement results.

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Section: Simulation Toolmentioning

confidence: 99%

Measuring and modeling the influence of atmospheric turbulence on a 2-µm laser beam

Yasa,

Keskin,

Figen

et al. 2023

Environmental Effects on Light Propagation and Adaptive Systems VI

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“…[50] Since jam-to-signal ratio (J/S) is the most important parameter when DIRCM jams the missile seeker, scientists search the ways to increase it. [51] Negative effects of atmosphere combining with plume on J/S is studied, [52] Beam shaping is one method to benefit from high received power and low noise features of the untraditional beams. Related with this, flattop and Super Gaussian beams are adapted to DIRCM systems, [53] acousto-optic modulators are used to apply beam shaping in countermeasure systems.…”

Section: Introductionmentioning

confidence: 99%

Propagation Characteristics of a Partially Coherent Gaussian Schell‐model Array Vortex Beam in the Joint Turbulence Effect of a Jet Engine and Atmosphere

Nabil,

Balhamri,

Bayraktar

et al. 2023

Annalen der Physik

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This work investigates the joint effects of jet engine exhaust‐induced turbulence and atmospheric turbulence on the propagation of a partially coherent Gaussian Schell‐model Array (GSMA) vortex beam. Using the two‐process propagation method, analytical formulae are derived for the cross‐spectral density, spectral density, degree of coherence, and beam width of the considered beam. The results show that the considered beam takes different shapes; when the spatial coherence is large, the spectral density of the GSMA vortex beam takes an elliptical shape, whereas when the spatial coherence is smaller, the spectral density remains a Gaussian shape. The evolution profile of the degree of coherence weakens gradually when the propagation distance, topological charge, and turbulence strength increase. Moreover, the profile of the degree of coherence takes the Gaussian profile when the propagation distance is longer or turbulence atmospheric is stronger. Furthermore, the results reveal that the corresponding beam spreads faster with a larger propagation distance, lower spatial coherence, and high‐strength turbulence. This study also concludes from the results that the beam is affected more when its propagation is near the jet engine exhaust, which means that this latter has a significant impact.

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Jamming effect analysis and reticle parameter identification of infrared spin-scan seeker under dynamic engagement environment

Li,

Chen,

Chen

et al. 2024

Infrared Physics & Technology

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Investigation of the influence of optical turbulence on DIRCM laser’s jamming effectiveness: A wave-optics approach

Cited by 5 publications

References 14 publications

Measuring and modeling the influence of atmospheric turbulence on a 2-µm laser beam

Measuring and modeling the influence of atmospheric turbulence on a 2-µm laser beam

Propagation Characteristics of a Partially Coherent Gaussian Schell‐model Array Vortex Beam in the Joint Turbulence Effect of a Jet Engine and Atmosphere

Jamming effect analysis and reticle parameter identification of infrared spin-scan seeker under dynamic engagement environment

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