Pulse or digital communications – Repeaters – Testing
Patent
1991-11-15
1993-12-14
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
370 13, 370 691, 4552261, H04B 346
Patent
active
052710360
ABSTRACT:
A method for recognizing modulation of radioelectric transmissions from instantaneous spectra of transmission observed in a determined frequency band by a Fast Fourier Transform spectrum analyze is disclosed wherein the method involves the calculation of a plurality of parameters for each transmission spectrum line which is observed. The parameters include the calculation of a mean amplitude of all the lines k of the spectrum contained in the determined frequency band and the calculation of a signal-to-noise ratio as well as a standard deviation in amplitude of each line of the spectrum. Also calculated is a coefficient of correlation COR(k,k) of amplitude of each line k with the homologous lines of the transmission spectrum contained in the determined frequency band. Subsequently, a comparison is made, through a network of neurons, of the parameters of each transmission spectrum with expected transmission parameters and an indication is made as to a correspondence between a transmission and an expected transmission when the difference detected by the comparison is at a minimum value.
REFERENCES:
patent: 4166980 (1979-09-01), Apostolos et al.
patent: 4305159 (1981-12-01), Stromswold et al.
patent: 4398286 (1983-08-01), Geesen et al.
Lobert Bruno
Sourdillat Bruno
"Thomson-CSF"
Ghebretinsae T.
Kuntz Curtis
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