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Abstract
In this paper, we explore the potential capabilities of new laser scanning-based method for direction determination. The method for fully coherent beams is extended to the case when interference pattern is produced in the turbulent atmosphere by two partially coherent sources. The performed theoretical analysis identified the conditions under which stable pattern may form on extended paths of 0.5–10 km in length. We describe a method for selecting laser scanner parameters, ensuring the necessary operability range in the atmosphere for any possible turbulence characteristics. The method is based on analysis of the mean intensity of interference pattern, formed by two partially coherent sources of optical radiation. Visibility of interference pattern is estimated as a function of propagation pathlength, structure parameter of atmospheric turbulence, and spacing of radiation sources, producing the interference pattern. It is shown that, when atmospheric turbulences are moderately strong, the contrast of interference pattern of laser scanner may ensure its applicability at ranges up to 10 km.
Highlights
In a previous paper [1], we developed a method according to which, for a synchronous scanning with two laser beams, a wave interference forms in the region of their superposition, with the frequency of resulting oscillation being uniquely related to the direction toward the source
We describe in detail the method for selecting instrument parameters, ensuring the necessary instrument operability ranges in the atmosphere for any turbulence characteristics possible
For the chosen instrument parameters of interferometric laser scanning (ILS), we presented the cross sections of distribution of the mean intensity of interference pattern, produced by ILS in the turbulent atmosphere
Summary
In a previous paper [1], we developed a method according to which, for a synchronous scanning with two laser beams, a wave interference forms in the region of their superposition, with the frequency of resulting oscillation being uniquely related to the direction toward the source. The possibility of recording the contrast of interference pattern, formed by optical waves in the atmosphere, is determined both by coherence of the sources of optical radiation, and by random inhomogeneities of refractive index of air along the radiation propagation path [2,3]. The method, developed for fully coherent beams, is generalized for the case when interference pattern is formed in the turbulent atmosphere by two partially coherent sources. The method is based on analysis of the mean intensity of interference pattern, produced by two partially coherent sources of optical radiation. For the chosen instrument parameters of interferometric laser scanning (ILS), we presented the cross sections of distribution of the mean intensity of interference pattern, produced by ILS in the turbulent atmosphere
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