Method of extracting target range and Doppler information from a

Details Method of extracting target range and Doppler information from a Method of extracting target range and Doppler information from a

1991-05-20

1992-02-25

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367904, G01S 1500

Patent

active

050918907

ABSTRACT:
A method of extracting target range and Doppler information from a Dopplepread signal is provided. An acoustic waveform is transmitted underwater and impinges upon a submerged Doppler-spread target. Doppler-spread sonar echoes resulting from the transmitted waveform are received and digitized. The received sonar echo is separated into its inphase and quadrature components thereby forming a complex vector function. A fourth-order cumulant spectrum is generated from the complex vector function based upon three time delays. In order to extract the range and Doppler information from the Doppler-spread signal, the first of the time delays is set equal to zero while the second and third time delays are set equal to one another.

REFERENCES:
patent: 4980868 (1990-12-01), Teel

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