An FMCW-type LIDAR imaging system, adapted to determine a distance z sc separating it from a scene, comprising: ∘ a coherent light source, adapted to emit a frequency-modulated continuous primary signal S p; ∘ a separation and recombination optical device, adapted to separate the primary signal S p into a reference signal S r directed towards a photodetector and into an object signal S o directed towards the scene, which backscatters a portion of the object signal S o called the backscattered object signal S or; and adapted to direct towards the photodetector along one and the same optical axis the reference signal S r as well as a portion S or,c of the backscattered object signal S or collected by a collection optical element; ∘ the collection optical element, adapted to collect the portion S or,c of the backscattered object signal S or; ∘ the photodetector, intended to receive the reference signal S r and the collected portion S or,c of the backscattered object signal S or,c, which interfere to form a heterodyne signal S h; ∘ a processing unit, adapted to determine the distance z sc of the scene from a beat frequency of the heterodyne signal S h; ∘ characterised in that it further comprises a reflector adapted to reflect in the direction of the scene a portion S or,nc of the backscattered object signal S or not collected by the collection optical element, • the collected portion S or,c of the backscattered object signal S or then being formed of first light beams S or,c not having been reflected by the reflector and second light beams S or,c having been reflected by the reflector and then by the scene; • the heterodyne signal S h therefore having a main component S h associated with said first light beams S or,c, and a secondary component S h associated with said second light beams S or,c; ∘ and in that the processing unit is adapted to determine the distance z sc of the scene from a beat frequency f b of the secondary component S h of the heterodyne signal S h. ∘ a coherent light source, adapted to emit a frequency-modulated continuous primary signal S p; ∘ a separation and recombination optical device, adapted to separate the primary signal S p into a reference signal S r directed towards a photodetector and into an object signal S o directed towards the scene, which backscatters a portion of the object signal S o called the backscattered object signal S or; and adapted to direct towards the photodetector along one and the same optical axis the reference signal S r as well as a portion S or,c of the backscattered object signal S or collected by a collection optical element; ∘ the collection optical element, adapted to collect the portion S or,c of the backscattered object signal S or; ∘ the photodetector, intended to receive the reference signal S r and the collected portion S or,c of the backscattered object signal S or,c, which interfere to form a heterodyne signal S h; ∘ a processing unit, adapted to determine the distance z sc of the scene from a beat frequency of the heterodyne signal S h; ∘ characterised in that it further comprises a reflector adapted to reflect in the direction of the scene a portion S or,nc of the backscattered object signal S or not collected by the collection optical element, • the collected portion S or,c of the backscattered object signal S or then being formed of first light beams S or,c not having been reflected by the reflector and second light beams S or,c having been reflected by the reflector and then by the scene; • the heterodyne signal S h therefore having a main component S h associated with said first light beams S or,c, and a secondary component S h associated with said second light beams S or,c; • the collected portion S or,c of the backscattered object signal S or then being formed of first light beams S or,c not having been reflected by the reflector and second light beams S or,c having been reflected by the reflector and then by the scene; • the heterodyne signal S h therefore having a main component S h associated with said first light beams S or,c, and a secondary component S h associated with said second light beams S or,c; ∘ and in that the processing unit is adapted to determine the distance z sc of the scene from a beat frequency f b of the secondary component S h of the heterodyne signal S h.