G - Physics – 01 – S
Patent
G - Physics
01
S
343/50, 343/7, 3
G01S 13/95 (2006.01) G01S 7/486 (2006.01) G01S 17/50 (2006.01) G01S 17/88 (2006.01)
Patent
CA 2025008
PULSED COHERENT DOPPLER LASER RADAR ABSTRACT OF THE INVENTION In a pulsed coherent Doppler radar, a Q-switched laser source develops a laser beam to have a high intensity pulse portion and a substantially lower intensity trailing tail portion. A switching device upon which the laser beam is incident directs substan- tially all of the energy of the pulse portion along a first propagation path towards a target, such as atmospheric aerosols, and substantially all Or the energy of the tail portion along the second propagation path. The target reflects the pulse portion as a received signal. A heterodyne detector upon which each of the received signal and the tail portion is incident, determines the Doppler shift of the received signal with respect to the tail portion. The detector uses the tail portion as the local oscillator. The acousto-optic modulator also upshifts the frequency of the tail portion.
Amzajerdian Farzin
Litton Systems Inc.
Swabey Ogilvy Renault
LandOfFree
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