Window blockage classification for LIDAR system

A LIDAR system, comprising:

• an emission unit comprising at least one emitter, configured to emit a first illumination beam to illuminate at a first angle of illumination (AOI) a first blockage region of a window blockage of an optical window, and configured to emit a second illumination beam to illuminate at a second AOI a second blockage region of the window blockage, the second blockage region at least partially overlapping the first blockage region;
• a sensing unit, comprising at least one detector, configured to receive a first blockage reflection of the first illumination beam, and to receive a second blockage reflection of the second illumination beam, the first blockage reflection having a first reflection intensity, and the second blockage reflection having a second reflection intensity;
• and
• a processor, configured to determine a classification of the window blockage, based on the first reflection intensity of the first blockage reflection and the first AOI of the first illumination beam, and based on the second reflection intensity of the second blockage reflection and the second AOI of the second illumination beam.