### ASA 125th Meeting Ottawa 1993 May

## 4aUW16. Signal parameter estimation via transfer matrix analysis.

**Woon Hyun Cho
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*Acoust. Simulation Lab., Naval R&D Ctr., Jinhae P. O. Box 18, Kyungnam,
Korea
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A new algorithm is developed for estimating the delay times and spectra in
mixed wave fields. The algorithm is applicable to a spatial and temporal data
window in which more than two events are present. In implementing the method it
is assumed that data are recorded at equispaced hydrophones located in a
spatial window in which the delay times are constant. Application of a
least-squares criterion reduces the mathematics to an eigenvalue problem. The
eigenvalues are complex, and their magnitude determines the frequency-dependent
SNR. The phase is a linear function of frequency with a slope that determines
the delay time over unit hydrophone spacing. The input data consist of the
cross-power spectra between subarrays that contain the same numbers of elements
and are shifted by zero or one hydrophone separation. Examples illustrate the
application of the algorithm to synthetic data.

Standards Committee S12 on Noise. Working group chairs will report on
their progress for the production of noise standards. The interaction with
ISO/TC 43/SC1 and ISO/TC 94/SC12 activities will also be discussed, with
reference to the international standards under preparation. The Chair of the
respective U.S. Technical Advisory Groups (H. E. von Gierke) will report on
current activities of these International Technical Subcommittees under ISO and
preparation for the next meeting of ISO/TC 43/SC1, scheduled to take place in
Oslo, Norway from 31 May to 4 June 1993.