Abstract: The beam produced by a pulsed laser is directed onto a target and, once reflected, is heterodyned in a mixer with the light signal from a local oscillator. The resulting reception beat signal is applied to a chronometer to measure the distance from the target. A fraction of the transmitted beam is deviated to the mixer and heterodyned with the signal from the local oscillator to produce a transmission beat signal which is stored and then combined with the reception beat signal.

Abstract: The beam produced by a pulsed laser is directed onto a mobile and, once reflected, is heterodyned in a mixer with the light wave produced by a local laser operating in continuous mode.A part of the beam produced by the local laser is directed onto the target. The output of the mixer is applied to an opto-electronic circuit which derives a composite electric signal which is separated by appropriate filters into a first component representative of the distance from the mobile and a second component representative of the radial velocity of the mobile.