Process and apparatus for improved interference suppression in e

Details Process and apparatus for improved interference suppression in e Process and apparatus for improved interference suppression in e

1996-10-28

1998-08-04

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 7, 342179, G01S 1500

Patent

active

057904758

ABSTRACT:
In echo-location and imaging systems, interference suppression is accomplished by shaping the transmitted signal waveform. Interference suppression permits more accurate range estimates or image formation, respectively. These specially shaped waveforms can also be used in communication systems to secure more accurate message transmission in the presence of interference. Shaping of the transmitted signal may be accomplished in two ways: (1) by convolving an elemental waveform with a multi-level pseudorandom sequence (i.e., binary, ternary, Poisson, etc.); or (2) by transforming nonlinearly the amplitude of the elemental waveform to give it high skewness. Interference suppression in the former case is achieved through matched filtering (replica correlation or pulse compression), and in the latter case it is accomplished by bispectrum-bicoherence processing.

REFERENCES:
patent: 4639548 (1987-01-01), Oshima et al.
patent: 4837766 (1989-06-01), Yoshida
patent: 5175558 (1992-12-01), Dupree

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