Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Reexamination Certificate
2011-04-19
2011-04-19
Pihulic, Dan (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
Reexamination Certificate
active
07929375
ABSTRACT:
The invention is a method for improved active sonar using a singular value decomposition filtering and a Volterra-Hermite Basis Expansion to model real active sonar measurements. The fitting model minimizes the sum of the squared errors between a measured channel response, z(t), and model response, y(t), which is a fitted Volterra Series solution. The model requires as input an excitation waveform, x(t), to which is fitted the model response, y(t). A contracted broadband cross-ambiguity function is used to correct the excitation waveform for Doppler and range effects. Once completed, the modeled response can be used to determine the linearity or non-linearity of the channel effects. Appropriate measures can be utilized to reduce these effects on the measured channel response.
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Katz Richard A.
Nuttall Albert H.
Kasischke James M.
Nasser Jean-Paul A.
Pihulic Dan
Stanley Michael P.
The United States of America as represented by the Secretary of
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