Combining pressure- and particle motion sensor signals in marine seismic streamers

Methods for calculating an upward wave field from particle motion sensor signals (Gs signal, 52) and pressure sensor signals (Hsignal, 51) are presented. The particle motion sensor signals (Gs signal, 52) and the pressure sensor signals (Hsignal, 51) are transformed from a time domain (t) to a frequency domain (f). An upward wave field (U) is calculated as a combination of the particle motion sensor signal (52) multiplied by a first scaling function (Eq. 1, 19, 20, 23) and the pressure sensor signal (Hsignal, 51) multiplied by a second scaling function (Eq. 16, 19, 20, 23). The first scaling function increases and the second scaling function decreases as frequencies increase over the frequency range.