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http://hdl.handle.net/2117/2112
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| Title: | Analysis of beam wander effects for a horizontal-path propagating Gaussian-beam wave: focused beam case |
| Authors: | Recolons i Martos, Jaume Andrews, L. c. Phillips, R. l. |
| Other authors: | Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció |
| Keywords: | Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions::Radiocomunicació i exploració electromagnètica::Teledetecció Laser beams Fluctuations (Physics) fluctuations laser beams light propagation optical focusing refractive index beam wander effects horizontal-path propagating Gaussian-beam wave focused beam case scintillation index large-aperture focused beam uplink collimated beam first-order Rytov approximation failure computer simulations weak fluctuation regime beam irradiance profile hot spot displacement beam wander centroid displacement Làsers Fluctuacions (Física) |
| Publisher: | SPIE-INT SOCIETY OPTICAL ENGINEERING |
| Abstract: | Failure of the first-order Rytov approximation to properly predict the scintillation index of a large-aperture focused beam, or an uplink collimated (or focused) beam, has been discussed in several recent publications, which cite beam wander effects as the main reason for this failure. We use computer simulations to examine several aspects of beam wander phenomena on a propagating convergent beam in the weak-fluctuation regime over a horizontal path at high altitude for which the refractive index structure parameter is on the order of C=1.39×10−16 m−2/3. Simulation results are presented at various ranges up to 10 km for (1) the beam wander centroid displacement, (2) the kurtosis excess of the irradiance profile, (3) the irradiance profile, (4) the mean-square hot spot displacement from the boresight and from the centroid, and (5) the scintillation index at the optical axis of the beam. In addition, simulation results are compared with theoretical models. Peer reviewed |
| Appears in Collections: | Documents de recerca
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