Patent ID: 8867588

Claim:
A receiver device for receiving a chirp signal sent over a link by a chirp transmitter, comprising: a chirp receiver configured to receive a chirp signal comprising a first chirp, wherein the first chirp has a first gradient g, a magnitude of said first gradient being greater than one; a correlator configured to correlate the received first chirp, or a modified version of said received first chirp, with an expected first chirp to produce a first set of correlation results, wherein said first set of correlation results comprise: a first prompt correlation peak having a greater correlation magnitude than any other correlation peaks present in the first set of correlation results, and a first additional correlation peak; and a processor configured to make a first estimate of a fractional timing offset or fractional frequency offset of the received chirp signal from the receiver device by comparing relative magnitudes of the first prompt correlation peak and the first additional correlation peak; and an adjustment unit responsive to the processor configured to cause the adjustment of relative timing or frequency of the chirp receiver and the chirp transmitter by the first estimate.