Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1997-01-14
1998-12-08
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 285, G01C 308, G01P 336
Patent
active
058478167
ABSTRACT:
A micro-doppler ladar system for identifying and analyzing a target of interest includes a transmitter and coherent receiver pair, each of which includes a fiber optic power amplifier, and a controller. Preferably, the transmitter includes a master oscillator for generating a primary laser beam, a voltage controlled oscillator (VCO) for generating a VCO signal having a predetermined, repetitive frequency pattern, a frequency shifting circuit for varying the frequency of the primary laser beam responsive to the VCO signal to thereby produce a frequency-varying primary laser signal, and the optical fiber amplifier, which amplifies the frequency-varying primary laser signal to thereby produce a transmit laser beam. In addition, the coherent receiver, which responds to backscattered light produced by the interaction of the transmit laser beam with the target of interest, includes an optical fiber pre-amplifier for amplifying the backscattered light to thereby produce an amplified return laser beam, and a phase locked loop receiving the primary laser beam and the amplified return laser beam for generating an electrical signal indicative of range, velocity and a characteristic signature of the target of interest. The transmitter and coherent receiver can be operated in a target acquisition mode of operation for determining range and velocity, and a signature acquisition mode of operation for determining a characteristic signature of the target of interest responsive to the electrical signal. A method for operating the micro-doppler ladar system is also described.
REFERENCES:
patent: 4757268 (1988-07-01), Abrams et al.
patent: 5267011 (1993-11-01), Callender
patent: 5434662 (1995-07-01), Rockwell et al.
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patent: 5621514 (1997-04-01), Paranto et al.
patent: 5696782 (1997-12-01), Harter et al.
Otaguro Wil S.
Rice Robert R.
Zediker Mark S.
Hellner Mark
McDonnell Douglas Corporation
Powell Jr. Raymond H.J.
Westerlund Robert A.
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