Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1999-02-09
2000-12-19
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
244 316, 3561411, 701223, F41G 700, G01C 308, G01C 2100, G01B 1126
Patent
active
061633720
ABSTRACT:
One aspect of the invention relates to a laser ranging system. In one embodiment, the invention includes: a laser adapted to transmit a beam of laser radiation to a target area; a plurality of apertures for receiving reflected laser radiation from the target area, wherein each aperture is coupled to a start tank circuit by a start optical fiber, and wherein the start optical fibers are substantially the same length for each aperture in the plurality; an oscillator; a receive phase comparator circuit that determines the phase difference between the output signals from the start tank circuit and the oscillator; a transmitter tank circuit that generates an output signal responsive to the transmission of the laser radiation; a transmit phase comparator circuit that determines the phase difference between the output signals from the transmitter tank circuit and the oscillator; a pulse counter circuit that counts the number of pulses generated by the oscillator between transmission of the laser beam and the receipt of the signal from the start tank circuit; and a distance measuring circuit that calculates the distance from laser ranging system to the target based upon the number of pulses counted by the pulse counter, the phase difference determined by the receive phase comparator circuit and the phase difference determined by the transmit phase comparator circuit.
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Goan Robert
Sallee Bradley
Buczinski Stephen C.
Marconi Aerospace Defense Systems Inc.
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