Patent ID: 6396866
Filing Date: 2002-05-28
Classification: H04L

Abstract:
A method of acquiring a communications signal, the method comprising the steps of:a) storing a segment of an auto-correlating forward chirp sync waveform (FCS); b) storing a segment of a symmetric auto-correlating reverse chirp sync waveform (RCS); c) receiving said auto-correlating FCS, a predetermined number of symbols comprising a data frame, and said symmetric auto-correlating RCS, said auto-correlating FCS, said symbols, and said symmetric auto-correlating RCS susceptible to frequency error; d) correlating said FCS segment with said auto-correlating FCS to provide a FCS correlation signal; e) correlating said RCS segment with said auto-correlating RCS to provide a RCS correlation signal; and f) determining said frequency error based upon said FCS correlation signal and said RCS correlation signal.