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ELF Nonlinear Noise Processing Experimental Measurements. Part 1. Preliminary Results, for July and October 1975.
NAVAL RESEARCH LAB WASHINGTON D C
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A hybrid analog-digital signal processing method has been developed to investigate the potential of employing nonlinear noise processing to improve the signal-to-noise ratio SN in extremely low-frequency ELF communication systems. Preliminary results suggest that significant improvements in SN can be achieved if careful attention is given to clipping levels for high-amplitude atmospheric noise spikes and notch-filtering man-made interfering signals. Analysis of ELF noise data from Norway and Italy indicate, however, that the achievable improvemnt may be greater under low-noise conditions than under high-noise conditions. Author
APPROVED FOR PUBLIC RELEASE