Random Frequency Function Generation.
NAVAL RESEARCH LAB WASHINGTON D C
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The desired signature characteristics of the source generator for use on a long-range acoustic propagation experiment are defined. A programmable frequency function is proposed, consisting of slowly varying frequency undulations whose rate and magnitudes are pseudo-randomly distributed. The power spectral density and other significant properties of the frequency function are derived and displayed in both tabular and graphical form. A method is presented of implementing the random frequency function generator which uses a digital programmable read-only memory as its central element. The function generator is simple and reliable in concept and circuit, and should find application in a variety of underwater acoustic experiments. Author
- Test Facilities, Equipment and Methods
- Acoustic Detection and Detectors