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Delay-Doppler resolution performance of large time-bandwidth product linear FM signals in a multi- path ocean environment

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Abstract
Active sonar systems that transmit large time-bandwidth (TW)-product linear frequency modulated (LFM) waveforms and receive echoes from targets of unknow~r~an ge and speed can suffer considerable correlation losses that cannot be predicted from conventional (narrow-band) ambiguity function theory. As is well known, the theory can be modified to include the effects of Doppler distortion on large TW-product signals by correlating the received signal against a reference that is a timecompressed version of the transmitted signal. In this article, the effects of multipatli (or target highlight structure) and Doppler on the correlation process for rectangular-weighted large TW-product LFM waveforms are examined. Gaussian-weighted waveforms are also considered to examine sidelobe behavior. It is shown that in a multipath environment, the correlator output peak does not generally occur at the correct Doppler reference channel. This is due to the constructive/destructive interference of the summation ofcomplex delay-Doppler autocorrelation functions associated with each return. A summation technique that identifies the appropriate Doppler reference channel is proposed; this technique allows the target parameters to be estimated if the signal-to-noise ratio is sufficiently high.

URI
http://hdl.handle.net/20.500.12489/186

Report Number
SM-219

Source
In: Journal of the Acoustical Society of America, 84(5), November 1988, pp. 1709-1727

Collections
  • Technical Reports

Date
1989/04

Author(s)
Hermand, Jean-Pierre
; 
Roderick, William I.

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SM-219-UU.pdf (3.785Mb)

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