FIELD: physics.
SUBSTANCE: method of obtaining measurement results of an underground layer through a signal propagating through the layer comprises steps on which: a signal is received after propagation through the layer, the unmatched form of the wave is rejected, and the first event of the received propagated signal is determined, wherein the determining step includes: receiving the wave form which is the propagated signal, which includes the received propagated signal, which includes its first event, determining for a point along the wave form a likelihood function which represents the likelihood that corresponding parts of the waveform before and after the said point presents different signals, wherein the said step for determining likelihood involves applying a statistical function for determining the point along the wave form on which the likelihood function is maximum, and the position of the said point along the wave form is roughly determined, which is used at the step for determining likelihood. The determined point is given as the first event using a localisation function. Said method is realised using the corresponding device.
EFFECT: simple procedure for taking acoustic or electromagnetic measurements and high speed of obtaining required data.
23 cl, 16 dwg
