Abstract: The invention relates to a reduced-size FMCW lidar imager system. The imager system comprises an optical source 10 for a coherent, continuous and frequency-modulated primary signal Sp in order to illuminate the scene 2; an optical collection element 41 configured to collect a backscattered signal Sret,c; a photodetector 50 intended to receive a heterodyne signal Sh associated with the collected signal Sret,c; and a processing unit 60 configured to determine the distance zsc from the scene based on a beat frequency of the heterodyne signal sh. It is configured to fully direct the primary signal Sp to the scene 2. It additionally comprises a reflector 42 configured to reflect a portion Spr,nc, called uncollected signal Sret,nc, of the backscattered signal Sret, not collected by the optical collection element 41, in the direction of the scene 2.

Abstract: A distance measuring device according to one embodiment includes a light emitter, a light receiver, and a measurement section. The measurement section is configured to: generate a weighted value based on a degree of similarity of values of first and second portions, or a degree of similarity of values of first and second bottom portions; generate a third digital signal obtained by adding the second digital signal to the first digital signal based on the weighted value; and calculate a distance value from an object based on a position of a third portion.