The signal from the broad-band RAFOS-type source consists of
a carrier swept in frequency from roughly 200 Hz to 300 Hz,
over about 135 seconds. By application of a matched filter,
this signal can be compressed into a pulse about 0.02 seconds
wide. The results of this compression on 38 swept-frequency
signals are shown here.
The time resolution of this signal should permit separating sound arriving by different ray paths by arrival time, and the directional properties of the hydrophone array should allow separating the ray paths by the arrival angle of the ray. The results of this analysis are shown.
|Histogram of signal width|