A comparison of modelled time series with measurements

This paper describes a comparison between some modelled and experimental acoustic propagation data. Propagation experiments were carried out with CW pulses and a short, near vertical 14-element array in a loch. Then, rather than using standard frequency domain methods to calculate the propagation loss, the appropriate waveforms were calculated directly in the time domain using a method reported in a companion paper. The received signal is calculated very rapidly by using a time varying convolution which takes care of the arbitrary pulse and automatically handles modal effects (including cut-off), Doppler, correlation between hydrophones, and temporal fluctuations. Comparisons are made between the measured and predicted waveforms and their spectra for various hydrophone positions