January 1972 | NTIA Technical Report OT TM 74

Correlation of Man-Made Radio Noise Received on Two Antennas

Robert T. Disney

Abstract: The correlation of the man-made radio noise envelope voltage from two receiving systems was measured as a function of the antenna configuration of the systems. Combinations of vertical omnidirectional antennas and half-wave dipole antennas in corner reflectors were used at 50 and 250 MHz. Pairs of omnidirectional antennas were employed at both frequencies, but the dipoles were operated at 250 MHz only. The latter were configured to detect either the vertical or horizontal component of the noise and to obtain azimuthal information. The correlation coefficients for 10 sec samples and n-10 sec combined samples were found as a function of the types of antenna, the separation of the antennas, the frequency, the direction of arrival, and polarization of the man-made radio noise. The results based on the limited data from this pilot study indicate a good possibility of the noise being correlated to a degree that would provide a useful noise cancellation-signal enhancement scheme.

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