Method of measuring distance between two observation points

Details Method of measuring distance between two observation points Method of measuring distance between two observation points

1984-11-30

1987-01-27

Hix, L. T.

Optics: measuring and testing

Range or remote distance finding

With photodetection

34087029, G01C 308

Patent

active

046391290

ABSTRACT:
The present invention relates to a telemeter and to a method of determining the distance separating two points. The method comprises the steps consisting in (a) comparing the phase (.phi.) of the modulation of an emission signal and of a received returned modulated signal (16), (b) in generating a signal representative of the value of the instantaneous variance (V(.phi..sub.i)) of the phase samples (.phi..sub.i) (107), (c) in generating an estimation of the phase on the basis of a signal derived from the average (.phi..sub.E) of n phase samples (.phi..sub.i) which have been weighted by their instantaneous variance, (d) in generating a signal representative of the value of the distance (D) on the basis of the estimated phase value (.phi..sub.E), and (e) in displaying said value of the distance.

REFERENCES:
patent: 3714654 (1973-01-01), Wicks et al.
patent: 3723951 (1973-03-01), Kush, Jr. et al.
patent: 4146328 (1979-03-01), Hullein et al.
patent: 4453223 (1984-06-01), Ravel

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