MODAL DECOMPOSITION IN BROADBAND BEARING SPACE

Authors
  1. Ashley, A.T.
  2. Walker, R.S.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Detection of signals via broadband techniques is of increasing interest in passive sonar. Theoretically, the intrinsically large bandwidth, B, need only be coupled with a relatively short integration time, T, in order to provide enough bandwidth-time, BT, for detection at low signal-to-noise ratios. The detection performance, however, is ultimately dependent upon the accuracy with which the background noise level, and hence the threshold for detection, can be obtained. This paper approaches this noise normalization problem, for a line array receiver, from a unique point of view. The broadband bearing map (BBM), which represents the power of broadband signals as a function of bearing obtained via conventional beamforming methods, is parameterized via a modal decomposition of its inverse Fourier transform. TRUNCATED
Report Number
DREA-TM-84-H — Technical Memorandum
Date of publication
15 May 1984
Number of Pages
32
DSTKIM No
84-02890
CANDIS No
91940
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS;Hardcopy

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