Patent ID: 6052080
Filing Date: 2000-04-18
Classification: G01S

Abstract:
Apparatus for distance measurement,wherein a signal source (SQ) is present for generating a frequency-modulated signal,wherein a transmission/reception stage (SES) and a first mixer (MI1) are present,wherein this first mixer is arranged such that it can mixer a signal coming from the transmission/reception stage with the signal generated by the signal source,wherein a reference unit (REF) is present that comprises a surface wave element (OFW) and a second mixer (MI2) and that is provided for delaying the signal coming from the signal source in terms of time and mixing it with the undelayed signal,wherein an evaluation unit (AE) is present that is arranged such that the signals formed by the mixers are supplied to it, andwherein this evaluation unit is configured fora) determining the frequency characteristic of the signal stemming from the second mixer from said signal dependent on the time for arbitrarily prescribed test subject distances, andb) determining the test subject distance with best coincidence by a comparison of these frequency characteristics to a signal stemming from the first mixer by correlation of evaluation according to the least error square.