DIGITAL COMPUTER ALGORITHM FOR PROCESSING SONAR SIGNALS

Abstract

An algorithm for detecting and tracking dynamically-related sets of unstable passive sonar signals is disclosed. The algorithm detects, enhances, tracks and displays both stable and unstable passive sonar signals, while organizing them into dynamically-related groups. The algorithm is implemented as part of a general purpose digital computer/peripheral system that performs: power spectrum analysis on the segmented time-waveform from the hydrophone, processing of the spectra for detection and enhancement of the signal by the novel algorithms of the present invention and other methods, formatting and displaying of the detected and enhanced signals. The algorithm of the present invention (the ABT, or Automatic Band Tracking algorithm) detects persistent signals having related features by means of correlation and enhances by mathematical integration (or smoothing) of the detected signals. Signals belonging to several unrelated sets may be processed by successive ABTs with each ABT simultaneously displaying its processed portion of the total signal-content, while removing precisely that signal from the spectrum to which the succeeding ABTs are assigned.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1ROBERT A. DUFAULT

Sensitive facility: Bethesda MD (defense contractors)

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