The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 2000
Filed:
Jul. 06, 1998
Applicant:
Inventors:
Bruno Maino, Samarate, IT;
Alberto Bellazzi, Cameri, IT;
Assignee:
Finmeccanica S.p.A., Rome, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B64C / ;
U.S. Cl.
CPC ...
244 1713 ; 244 60 ; 180337 ; 180338 ;
Abstract
The method includes the steps of: acquiring a signal from an acceleration sensor; calculating the Hilbert transform of the signal filtered and sampled beforehand; defining a complex signal having the filtered and sampled signal as the real part and the Hilbert transform of the filtered and sampled signal as the imaginary part; calculating a phase signal given by the difference between the phase of the complex signal and a reference phase; calculating the variance of the phase signal; comparing the variance with at least one predetermined threshold; and generating an alarm signal if the variance exceeds the threshold value.