System and method for sidelobe reduction using...

Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver

Reexamination Certificate

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C342S159000, C342S195000, C342S196000, C342S131000, C342S132000, C342S134000, C342S135000, C342S162000

Reexamination Certificate

active

11207430

ABSTRACT:
A radar system and method for detecting targets using pulse-compressed signals is disclosed. In one application, the systems and methods can be used to detect one or more relatively small targets whose pulse-compressed signals are masked by the time-sidelobes of a larger target's return signal. The method includes an iterative, detect-and-subtract signal algorithm that processes the post-compressed signal to detect multiple targets. Specifically the processing algorithm operates on the post-compressed signal to identify a point spread function (PSF) that corresponds to the relatively large target. Once identified, the PSF corresponding to the largest target in the post-compressed signal is subtracted from the post-compressed signal to generate a residual signal. This residual signal, in turn, includes the PSFs for the other targets. This process of identifying and subtracting the PSF of the largest target in the residual signal is then repeated until all targets are detected.

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“Evaluation of a pulse coding technique for speckle reduction and structure characterization”, Rao, N.A.H.K.; Abury, M. Ultrasonics Symposium, 1993. Proceedings., IEEE Oct. 31, 1993-Nov. 3, 1993 pp. 1175-1180 vol. 2.

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