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:
Sep. 20, 2011
Filed:
Nov. 24, 2006
Pierre-andré Laurent, Bessancourt, FR;
Pierre-André Laurent, Bessancourt, FR;
Thales, , FR;
Abstract
A system and method for estimating and tracking the frequency offset for a transmission system whose bandwidth is not insignificant with respect to the central frequency, the system transmitting a waveform including fixed carriers whose level is substantially greater than that of the carriers transporting the information, the carriers having frequencies F. . . F, and the useful signal carrying the information. The system has N banks () of band-pass filters with, each bank having P filters, suitable for covering all of the values that the frequencies F. . . Fmay take after Doppler offset. A filter output is connected to a quadratic envelope detector. P adders () are suitable for adding the corresponding outputs of the N banks of filters. A system () detects the position of the two largest maxima from the P sums and validates the position of the largest maximum. A system () stores the positions of the two largest maxima and their 'weight' and for predicting the current value. A system () validates/replaces the position found. A system () converts the positions into estimated Doppler and filters the latter through a low-pass filter.