After fixing on the divergent angle

peak power of laser pulse

parameters of received optical system and the geometrical configuration between laser and received optical system

a faint target image of longer range with higher resolution obtained by active imaging system is constrained by imaging and processing technologies. With longer range and limited laser energy

it is impossible to illuminate the entire scene at once

and the illuminance obtained by each receiver pixel of CCD can not achieve an adequate level. In order to increase the imaging range of imaging system with given per-pulse laser energy

and to reduce atmospheric turbulence effects on image resolution

multi pulses may be employed to obtain image data over the whole scene and radiometric conceptions are used to establish the maximum scene illumination region during each exposure.A unique multiframe postprocessing technique is investigated in this paper. It is shown that in the presence of atmospheric turbulence and coherent speckle effects

this approach can produce superior results to conventional scene flood illumination.