Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1994-05-26
1995-07-11
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
367125, 367130, 367135, G01S 1500
Patent
active
054327539
ABSTRACT:
A system for target detection and localization with an algorithm for performing target motion analysis (TMA) using data from a passive sonar array and which works directly with beam spectra to estimate the target track. The system determines when the coordinate trajectory of a hypothesized target aligns with the coordinate trajectory of an actual target and operates by forming long-term integrated spectral values from short-term values of frequency and angle coordinate values. The hypothesized target track that yields the maximum long-term integrated spectral value is used as the estimate of the true target track. A track generator is used to generate hypothesized target tracks for a search grid in the form of vectors that are clocked downward in a chain of latches. The latches are connected through computational elements, which are supplied with non-acoustic data, and RAMs to a summation pipeline, the RAMs being supplied with data from an array's sonar processor. The computational elements compute and provide angle and frequency addresses to the RAMs whose outputs are applied to adders in the summation pipeline. Each RAM holds data for a single two-dimensional FRAZ spectrum. The summation pipeline supplies a completed sum of short-term spectral values at its output to provide the required long-term integrated spectral values.
REFERENCES:
Joseph C. Hassab; "Contact Localization and Motion Analysis in the Ocean Environment: A Perspective": pp. 136-147; Published in the IEEE Journal of Oceanic Engineering, vol. OE-8, No. 3, Jul. 1983.
Marc Solal et al: "Simultaneous detection and target motion aanalysis from conventional passive beamforming outputs": pp. 1321-1324; published in IEEE Int. Conf. on Acoustics, Speech and Signal Processing, 1991(ICASSP '91).
Brian H. Maranda et al: "Decetion and Localization of Weak Targets by Space-Time Integration": published in IEEE Journal of Oceanic Eng., vol. 16, No. 2.
John A. Fawcett et al.: "Localization by Mamimizing Long-Term Integrated Spectral Power": pp. 460 to 464; published in the IEEE Trans. on Signal Processing, vol. 40, No. 2, Feb. 1992.
Her Majesty the Queen as represented by the Minister of National
Pihulic Daniel T.
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