Experiences of data gathering and processing at sea

Last year the authors were concerned with an extensive series of sea trials which had been planned to extend the knowledge of the effects of the ocean medium on propagation of acoustic pulses of varying time-bandwidth products. Propagation is used here in its widest sense referring not only to the usually measured energy loss but also to the loss of coherence in this tYPe of pulse due to the temporal and spectral spreading effects of the medium and its boundaries.