Accession Number : AD0652622

Title :   CROSS-SPECTRUM VERSUS SPECTRUM FOR NOISE DIRECTIONALITY MEASUREMENT.

Descriptive Note : Technical rept.,

Corporate Author : BELL TELEPHONE LABS INC WHIPPANY N J

Personal Author(s) : Hirsch,Peter

Report Date : 06 JUL 1966

Pagination or Media Count : 12

Abstract : The report presents a derivation showing that, given two crossed linear arrays, the cross-spectrum of the array outputs is a better estimator of the noise field directionality than is the spectrum of the sum of the array outputs. When the two arrays each have a 10-degree beamwidth and sidelobe level of 0.05, the cross-spectrum is a tolerable estimate of the noise power from some particular direction, if the power from that direction exceeds the general background level by about 7 dB. (Author)

Descriptors :   (*RADIOFREQUENCY INTERFERENCE, *MEASUREMENT), DIRECTION FINDING, LINEAR SYSTEMS, MATHEMATICAL ANALYSIS, ANTENNA ARRAYS, RADIOFREQUENCY POWER, NOISE, FREQUENCY, VOLTAGE, EQUATIONS, POLYNOMIALS

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE