Light detection and ranging

A light detection and ranging, (LIDAR) system comprising:

• a spatial light modulator (SLM) configured to display a diffractive pattern comprising a hologram of a structured light pattern, wherein the structured light pattern comprises an array of light spots;
• a light source configured to illuminate the diffractive pattern in order to form a holographic reconstruction of the structured light pattern, wherein the structured light pattern is projected onto a scene;
• a detection system comprising a plurality of light detection elements, each arranged to detect light from a respective individual field of view of the scene and to output a respective detected light signal,
• wherein a first subset of the individual fields of view are illuminated by a light spot of the structured light pattern and a second subset of the individual fields of view are not illuminated by a light spot of the structured light pattern;
• and
• a processor configured to identify noise in a first detected light signal, relating to an individual field of view of the first subset during a time window within which the structured light pattern is projected onto the scene, using a second detected light signal, relating to an individual field of view of the second subset during said time window.