Abstract: There is provided a LIDAR system and method for surveying a Field of View (FOV) comprising: an illumination system, a light-sensitive detector, a scanning unit and at least one processing unit, wherein the illumination system is configured to project a first light with first illumination parameters, deflected by the scanning system through a window toward the field of view of the LIDAR system; and the light-sensitive detector is configured to receive light reflected from objects in the field of view and deflected by the scanning unit; and the at least one processing unit is configured to analyze detected light and determine information about the objects, and wherein the illumination system is further configured to project a second light with second illumination parameters toward a window vicinity.