Accession Number : AD0723185

Title :   Direct Computation of Power Density and Energy Density Spectra.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Moseley,William B.

Report Date : 11 AUG 1970

Pagination or Media Count : 40

Abstract : Direct methods which use finite discrete Fourier transforms in the computation of both power and energy density spectra are examined. The methods are shown to be applicable to most physically realizable processes. The 'intrinsic' windows involved in the methods and the variance of the resulting estimates are discussed. A generalized smoothing technique is developed which significantly reduces the variance of the estimates and greatly suppresses leakage from side lobes. (Author)

Descriptors :   (*INTEGRAL TRANSFORMS, SPECTRUM ANALYZERS), (*POWER SPECTRA, NUMERICAL ANALYSIS), FOURIER ANALYSIS, NUMERICAL INTEGRATION, SAMPLING, ENERGY

Subject Categories : Numerical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE