Leica Geosystems Ag

Ernst Ramseier

Beat Aebischer

Silvio Gnepf

Christian Betschon

Bernhard G&auml;chter

Georg Orawez

Esther Rutishauser

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.

Method for measuring the distance to at least one target

An arrangement for measuring the direction of the geomagnetic field {right arrow over (B)} , in the proximity of a magnetic jamming device with a magnetic field direction variable as a function of time, which is distinguished by the fact that at least two magnetic field measuring devices are provided, each of which measures all three vector components of the total magnetic field ({right arrow over (B)} ,{right arrow over (B)} ), the magnetic field measuring devices have a position, ({right arrow over (r)} ,{right arrow over (r)} ,{right arrow over (r)} ) which is invariable as a function of time and is fixed relative to one another and relative to the jamming device, and the measured values can be called up synchronously and can be evaluated according to {right arrow over (B)} &equals;({right arrow over (B)} &plus;{right arrow over (B)} )/2&plus;P&middot;({right arrow over (B)} &minus;{right arrow over (B)} ), P({right arrow over (r)} ,{right arrow over (r)} ,{right arrow over (r)} ) describing the geometric position of the magnetic field measuring devices relative to one another and relative to the jamming device.

Geomagnetic field direction measuring system

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Widnau, Switzerland

Ernst Ramseier