Patent ID: 7623222
Filing Date: 2009-11-24
Classification: G01S

Abstract:
1. A high-precision distance-measuring method comprising the steps: emission of pulsed electromagnetic radiation having at least one pulse repetition frequency via: the radiation passed via the reference path defining at least one start pulse and the radiation passed via the measuring path defining at least one stop pulse, reception of the radiation scattered back by the target and of the radiation passed via the reference path, the radiation scattered back by the target and the radiation passed via the reference path being detected in parallel so that the received signal has components of the radiation scattered back by the target and of the radiation passed via the reference path, and the radiation being converted into a received signal, and determination of at least one distance to the at least one target from the received signal, wherein at least two pulse repetition frequencies are chosen so that their coordinated pulse intervals do not have a common multiple in the range of the order of magnitude of the maximum external measuring path.