Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1994-11-03
1996-09-03
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
342135, 368120, G01C 308, G04F 800, G01S 1308
Patent
active
055528783
ABSTRACT:
An electronic vernier for a laser range finder enhances the resolution of the range finder to that of the vernier without increasing the frequency of the range clock. The range finder includes a range counter circuit for storing the total integer number of clock pulses produced by a range clock and counted by a range counter. The vernier includes a tapped delay line which subdivides the clock pulses into a predetermined plurality of equal increments. The contents of the tapped delay line at the time of transmission of the ranging pulse, and reception of the reflected ranging pulse identify the phase of the clock pulse. An electronic storage register of the vernier captures and stores the contents of the tapped delay line, and then transfers vernier transmission and reception fractions to a system controller for computing a corrected range measurement from the total integer number of clock pulses produced by the range clock and counted by the range counter. The error in the range measurement is reduced to the error range of the taped delay line without increasing the frequency of the range clock.
REFERENCES:
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patent: 4439046 (1984-03-01), Hoppe
patent: 4518256 (1985-05-01), Schwartz
patent: 4620788 (1986-11-01), Giger
patent: 5199008 (1993-03-01), Lockhart et al.
patent: 5200933 (1993-04-01), Thornton et al.
patent: 5291262 (1994-03-01), Dunne
Buczinski Stephen C.
McDonnell Douglas Corporation
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