Leica Geosystems Ag

Bruno Pfiffner

Jürg Hinderling

Paul Benz

Markus Geser

Roland Graf

Markus Hammerer

J&uuml;rg Hinderling

Marcel Buerki

Gerhard Bayer

Günther Hanns

G&uuml;nther Hanns

Marco Landert

In geodetic measuring systems and measuring devices ( ) there exists a need to find and detect, rapidly and automatically, marker points to be measured that are provided with a marker (retro reflector) ( ). For the rapid detection, identification and determination of the horizontal angles of such a marker, even at greater distances, electromagnetic radiation in the form of a vertical fan ( ) is transmitted by a transmitter unit ( ) whose radiation is received, after reflection from the marker, by a receiving unit with a view field in the form of a vertical fan. By analyzing the signal strength and the apparent object size, a plausibility test and a reliable suppression of foreign or interference markers can be achieved. Such a marker searching device is marked by a selective analysis of specific characteristics of a marker detected. On the basis of the plausibility test, a rapid, certain and robust location of markers is possible.

Process and device for the automatic location of reference markers

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Hochwiese, Switzerland

Bruno Pfiffner