Leica Geosystems Ag

Esther Rutishauser

Beat Aebischer

Christian Betschon

Ernst Ramseier

Bernhard G&auml;chter

Georg Orawez

To measure the distance to targets, local maxima exceeding a threshold (&egr;) and being associated with a correlation function (f) are determined, the reference values of which are obtained from scalar products of a received signal (e), produced by reflections of an optical pulse by the targets, and number of comparison functions, copies of a reference function (r) which are shifted as a function of time, and the transit times of the reflections are derived from the time-related shifts of the corresponding comparison functions. By interpolation with respect to the time-related shifts or optimization thereof, for example by adjusting them so that the orthogonal distance of the received signal (e) from the vector space which is spanned by the corresponding comparison functions is a minimum, the transit times can be determined even more accurately.

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Wolfhalden, Switzerland

Esther Rutishauser