Abstract
On the basis of Fourier synthesis of frequency components, a WKBZ mode approach to pulse propagation in ocean channels is presented, and applied to calculations of propagation of a signal energy and waveform. For propagation of pulse signals with several bandwidths in an Arctic surface duct, the results calculated from the WKBZ code show that with increase of bandwidth the transmission loss curve of pulse-signal energy gradually becomes smooth and approaches that of the range-averaged intensity of the center frequency. For long range propagation of a band-limited signal with frequencies from 100 to 150 Hz in a North Pacific channel, signal waveforms, including arrival times and amplitudes at ranges from 44 to 4000 km, were calculated by using WKBZ and conventional normal mode (CNM) codes. A great number of calculations show that both the arrival times and amplitudes calculated from the WKBZ code are well consistent with those from the CNM code, but the computation speed of the WKBZ code is faster than that of the CNM code by a factor of over 100.
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