Considerations for using swept-frequency waveforms in marine seismology / Brian H. Maranda. : D68-6/264-2014E-PDF

"This report has been written as part of a joint research project between Defence Research and Development Canada (DRDC) Atlantic and the Offshore Energy Environmental Research (OEER) Association. One of the research goals is to increase the understanding of alternative geophysical exploration methods for the marine environment, and this report highlights many of the issues that need to be addressed when applying frequency-modulated (FM), or swept-frequency, waveforms to geophysical prospecting of the ocean seabed. A key component of the signal processing for FM pulses is the matched filter, which is described at an introductory level. Examples are given to illustrate the excellent resolving capability of the linear-FM pulse, which is a consequence of the pulse-compression property of the matched filter. Also discussed are other, more general, kinds of signal modulation. Comments are then made on issues that arise in the specific application of FM waveforms to reflection seismology in the marine environment. Finally, the report also contains an Annex on the physical units relevant to marine seismology"--Abstract, page i.

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