| 摘要 |
Systems and methods are described for carrier tracking. A center frequency of a signal having substantially equal spectral power on both sides of said center frequency is tracked by comparing spectral power contents of filtered versions of the signal. More specifically, a first filter (H1) having a center frequency F1 produces a first output from the signal and a second filter (H2) having a center frequency F2 produces a second output from the signal; the second filter (H2) being matched with the first filter (H1) and the following equiations are met: F1 = FCR + Delta-F and F2 = FCR-Delta F, where FCR is the estimate of the center frequency of said signal and Delta F is a change in frequency. The spectral power contents of the first and second outputs are calculated and the difference therebetween is used to revise the estimate of the center frequency.
|
