Accession Number:

ADA021975

Title:

ELF Nonlinear Noise Processing Experimental Measurements. Part 1. Preliminary Results, for July and October 1975.

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

• Meyers,William D.
• Davis,John R.

Report Date:

1976-03-01

Pagination or Media Count:

14.0

Abstract:

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

Descriptors:

• *SIGNAL PROCESSING
• *ATMOSPHERICS
• *RADIO RECEPTION
• THRESHOLD EFFECTS
• SIGNAL TO NOISE RATIO
• ANALOG TO DIGITAL CONVERTERS
• RADIOFREQUENCY INTERFERENCE
• THUNDERSTORMS
• EXTREMELY LOW FREQUENCY
• CLIPPER CIRCUITS

Subject Categories:

• Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE