Telemeter comprising a pilot oscillator and an oscillator kept i

Details Telemeter comprising a pilot oscillator and an oscillator kept i Telemeter comprising a pilot oscillator and an oscillator kept i

1977-10-05

1979-03-27

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

340 1R, 343 12R, G01C 308

Patent

active

041463285

ABSTRACT:
An infra-red telemeter comprises a pilot oscillator 1 and a controlled oscillator 2 kept in phase with the pilot oscillator 1. The controlled oscillator 2 provides the modulation frequency for transmission, either directly for fine measurement or via a counter 11 which divides by M. for coarse measurement, while the pilot oscillator 1 provides a heterodyne frequency, either directly or after division by N in a counter 17, respectively. After the received modulation signal has been mixed with the heterodyne frequency, a phase detector 18 compares the phase of the mixed signal with the phase of a reference low frequency obtained by the frequency of oscillator 1 being divided by H in counter 17. The phase servo loop operates continuously, in the case of both fine and coarse measurement.

REFERENCES:
patent: 3728025 (1973-04-01), Madigan et al.
patent: 3778159 (1973-12-01), Hines et al.
patent: 4011561 (1977-03-01), Dounce

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