Patent ID: 7982859

Claim:
A method for deriving geodetic distance data, comprising: a signal generator for generating at least two discrete high modulation frequencies in the MHz to GHz range; a system including: a system input; an optical radiation source; at least one target object; and a receiver having a system output; and evaluation electronics, the method comprising the steps of: excitation of the system with the at least two discrete modulation frequencies by application of at least one excitation signal to the system input; recording of at least one signal shape of a system response as a change in signal amplitude with respect to time by an ADC at the system output in response to the excitation; derivation of at least one distance datum from a signal shape of the at least one system response by the evaluation electronics; the distance data being derived with a measuring accuracy in a millimeter range from: at least a part of the signal shape of the at least one system response, or a time structure of the signal shape of the at least one system response, the distance data being derived according to a model of the system wherein a system identification is performed with a parameter of the model of the system as the transit time to the target objects at which the measuring beam is directed, the determination of the distance is including the measured signal shape in the time domain or frequency domain.