Accession Number:

AD0261029

Title:

PRECIPITATION CHARGING AND CORONA-GENERATED INTERFERENCE IN AIRCRAFT

Descriptive Note:

Corporate Author:

STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s):

Report Date:

1961-04-01

Pagination or Media Count:

252.0

Abstract:

The factors which determine the magnitude and spectra distribution of the radio interference occurring when an aircraft is operated in precipitation, called precipitation static, were studied. The first of these, the coupling between the antenna and the action of frequency and position on the aircraft was developed. The second factor is the spectral character of the corona-noise source. Included in the study of this factor was an investigation of the manner in which the source spectrum is affected by altitude. The third factor is the magnitude of the discharge current and its distribution among the discharges source is discussed with the aid of a reciprocity relationship. A technique for measuring absolute values of coupling factor as a function of frequency and position on the aircraft was developed. The second factor is the spectral character of the corona-noise source. Included in the study of this factor was an investigation of the manner in which the source spectrum i affected by altitude. The third factor is the magnitude of the discharge current and its distribution among the discharging extremities. Methods for determining the discharge current were devised and the problem of determining the distribution was investigate. To test the validity of the theory and the results of the laboratory work, calculations were made to predict the noise currents induced in the two test antennas employed in a flight-test program conducted in the Boeing 367-80. Although most of the research was done with dipole-type receiving antennas in mind, a brief investigation was made of the characteristics of loop antennas.

Subject Categories:

  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE