Abstract
Droplets are the primary factors which influence laser transmitting in bad weather. This paper researches the analytic expression of droplets influencing the laser, which is based on the geometric optic theory and distribution of raindrop size and shape. In this paper, the relationship between the incidence and emergence angle of droplets is discussed. The effects of an individual raindrop on Ladar divergence angle, illuminance and optical path difference are investigated, and then the cumulated influence of a large quantity of raindrops is analyzed. The illuminance of scanning the targets and laser radar received by the detector is presented.
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