The formulae and results of calculation of the spatiotemporal structure function of intensity in the optical image of a topographic object in a turbulent atmosphere are presented. The results can be used in development of algorithms for estimation of the crosswind velocity from optical images of natural scene.
The function of mutual coherence of the field and the mean intensity of partially coherent pulsed optical radiation scattered by an atmospheric layer have been calculated. It is shown that as the pulse duration decreases, the spatial coherence of backscattered radiation improves in comparison with the coherence of scattered continuous-wave (cw) radiation. In contrast to cw radiation, which scatters uniformly in the backward direction, the backscattering of pulsed radiation becomes nonuniform for shorter pulses, and for ultrashort pulse durations the backscattered radiation is localized near the strictly backward direction in the zone with transverse dimensions comparable with the initial size of the sensing beam.