Radar laser transmitter

Details Radar laser transmitter Radar laser transmitter

1987-08-14

1994-06-21

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

G01C 308

Patent

active

053232232

ABSTRACT:
A laser radar for scanning a target aperture having a predetermined array of locations comprising a laser means having a power source and a resonator cavity containing a lasing medium, the laser means providing a SINGLE FREQUENCY LIGHT SOURCE (FO); means for dividing the SINGLE FREQUENCY LIGHT SOURCE into FIRST and SECOND REFERENCE FREQUENCY BEAMS; frequency shifting means for frequency shifting the FIRST REFERENCE FREQUENCY BEAM to form a FREQUENCY SHIFTED BEAM; control means for providing APERTURE DIRECTION SIGNALS; scanner means responsive to the APERTURE DIRECTION SIGNALS for combining and directing the FIRST REFERENCE FREQUENCY BEAM and the FREQUENCY SHIFTED BEAM to each predetermined target aperture location and for receiving a combined REFLECTED REFERENCE FREQUENCY BEAM SIGNAL and a REFLECTED FREQUENCY SHIFTED BEAM SIGNAL from the target; detector means for combining and detecting a sample of the SECOND REFERENCE FREQUENCY BEAMS in combination with the REFLECTED REFERENCE FREQUENCY BEAM SIGNAL and the REFLECTED FREQUENCY SHIFTED BEAM SIGNAL to provide a RANGE CARRIER SIGNAL; monitor means for combining and detecting a sample of the SINGLE FREQUENCY LIGHT SOURCE, and a sample of the FREQUENCY SHIFTED BEAM to form a DEMODULATION REFERENCE SIGNAL; phase demodulation means referenced to the DEMODULATION REFERENCE SIGNAL and responsive to the RANGE CARRIER SIGNAL for demodulating the RANGE CARRIER SIGNAL to provide a RELATIVE AND ABSOLUTE RANGE SIGNAL; and signal processor and display means responsive to the RELATIVE AND ABSOLUTE RANGE SIGNAL and to the APERTURE DIRECTION SIGNALS for quantizing and storing the digital the digital value of the amplitude of the corresponding relative phase delay between the RELATIVE RANGE SIGNAL and the DEMODULATION REFERENCE SIGNAL for each respective location in the target aperture.

REFERENCES:
patent: 3082418 (1963-03-01), Milosevic
patent: 3437820 (1969-04-01), Thompson Jr, et al.
patent: 3522992 (1970-08-01), Jaffe
patent: 3542472 (1970-11-01), Smith-Vaniz
patent: 3625619 (1971-12-01), Scholdstrom
patent: 3750172 (1973-07-01), Tresselt
patent: 3778159 (1973-12-01), Hines et al.
patent: 4005936 (1977-02-01), Redman et al.
patent: 4163954 (1979-08-01), Hayes
patent: 4190361 (1980-02-01), Dubrunfaut
patent: 4537502 (1985-08-01), Miller et al.

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