QUADRICORRELATOR CARRIER FREQUENCY TRACKING

摘要

Systems and methods are provided for correcting frequency drift in satellite receivers based on quadricorrelator carrier frequency tracking. An intermediate frequency corresponding to a received satellite signal may be converted to a digital baseband signal. Frequency related information may be obtained based on quadricorrelator carrier frequency tracking of the digital baseband signal, and the information may be used in generating a quadricorrelator corrected channel. The quadricorrelator corrected channel may converge to the centroid of its spectrum. Thus, the advanced quadricorrelator frequency tracking may allow tracking and correcting frequency drift during baseband signal processing.

主权项

1. A system, comprising:
a low noise block (LNB) for demodulating satellite signals, the LNB comprising:
a quadricorrelator that is operable to generate center frequency offset indications for a digital baseband channel signal corresponding to a received satellite signal;a phase locked loop frequency tracker that is operable to produce a frequency error term based on the center frequency offset indications;a summer operable to sum the frequency error term with a frequency control word to produce a summed value representing a signal having a corrected center frequency; anda digital frequency synthesizer operable to generate, based on the summed value, a channel signal having a corrected center frequency for output to a satellite receiver/decoder.