Patent ID: 7619719

Claim:
Absolute distance-measuring method comprising the steps: emission of chirped electromagnetic radiation, in particular laser light, to at least one target to be surveyed and over at least one reference length, reception of the radiation scattered back from the target and of the radiation passed via the reference length, conversion of the received radiation into signals, in particular with interferometric mixing, determination of at least one distance to the at least one target from the signals, a digitized first interferogram of the radiation scattered back from the target and a digitized second interferogram of the radiation passed over the reference length being recorded during reception, wherein a virtual interferogram or the phase curve Δφ m·r (t k ) of the virtual interferogram is synthesized from phase curve data of the second interferogram, the determination of the at least one distance being effected by comparison of the phase curve data of the first interferogram with the phase curve data of the virtual interferogram.