Fig. 3From: Development and examination of new algorithms of traveltime detection in GPS/acoustic geodetic data for precise and automated analysisSchematic diagram of multipaths of acoustic waves. Multiples reflected at the surface and inside of the glass sphere and the seafloor may be recorded by the seafloor transponder. Observed time lag of 0.4–0.8 ms between first and secondary envelopes (Figs. 1e–j, 2b) assumes that the secondary envelope would be the multipath reflected at the glass sphereBack to article page