Accession Number:

AD0779874

Title:

Asymptotic Distribution of the Discrete Transform of a Nonuniformly Sampled Multidimensional Process.

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1974-05-03

Pagination or Media Count:

20.0

Abstract:

Multidimensional discrete transforms that map arbitrarily spaced sampled data into arrays of coefficients of arbitrary basis functions were considered in a previous paper. These studies are motivated by a model of observations uniformly spaced in time obtained simultaneously at a nonuniform set of spatial points. For the uniformly spaced samples the transformation becomes the familiar discrete finite Fourier transform DFT, and fast-Fourier-transform processing is applicable. The nonuniformly spaced samples generally require a transformation matrix that is not as highly factorable. For a two-dimensional sample space consisting of M nonuniform spatial points and N uniform temporal points, an efficient transformation is possible if M N. Under the same assumption this two-dimensional transformation will be shown to approximately diagonalize the covariance matrix. Asymptotic will refer here to the limit as N nears infinity, with M finite.

Subject Categories:

  • Cybernetics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE