Accession Number:

ADA109303

Title:

Linear High Resolution Frequency-Wavenumber Analysis

Descriptive Note:

Semi-annual technical rept. for period ending 1 Mar 75

Corporate Author:

SOUTHERN METHODIST UNIV DALLAS TX DALLAS GEOPHYSICAL LAB

Personal Author(s):

Report Date:

1975-03-01

Pagination or Media Count:

41.0

Abstract:

The marginal success of the several high-resolution frequency- wavenumber f-k techniques to data is cited from the literature. Their ability to resolve signals from two closely spaced sources is not markedly superior to that of ordinary beamforming. Moreover, such nonlinear techniques yield distorted magnitudes and azimuths. The ordinary f-k spectrum is shown to be no more than a 1-signal estimator, and the high resolution techniques to be but variations of that 1-signal estimator. In this paper the notion of the wavenumber spectrum is set aside. By analogy to the 1-signal estimator the ordinary f-k spectrum a linear M - signal estimator is developed. The high resolving power of this technique and the fidelity of its estimates is demonstrated theoretically and by computer examples both real and synthetic. Author

Subject Categories:

  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE