Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1985-02-25
1987-04-07
Hix, L. T.
Optics: measuring and testing
Range or remote distance finding
With photodetection
372 32, 372 94, G01C 308, H01S 313
Patent
active
046555889
ABSTRACT:
A heterodyne CO.sub.2 optical Doppler radar comprising a ring type of traitter laser and twin local oscillator lasers which are automatically controlled to operate at a difference frequency equal to the intermediate frequency of the radar, which may be in the VHF band. The output of one of the twin lasers is injected into the transmitter laser for stabilization purposes and the output of the other of the twin lasers is heterodyned with the received target return signals to form the radar's intermediate frequency signal.
REFERENCES:
patent: 3740664 (1973-06-01), Freiberg et al.
patent: 4515471 (1985-05-01), Eden
Chenausky Peter P.
Green, Jr. William J.
Gray David M.
Hix L. T,.
Kanars Sheldon
Maikis Robert A.
Murray Jeremiah G.
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