Methods to extend the frequency lock range of a received RF signal using a preamble-based frequency estimate

摘要

A method is presented to extend a frequency lock range of a received RF signal in a satellite receiver. One step in the method includes analyzing data information of a preamble associated with the received satellite RF signal. Another step includes determining an estimated frequency value that is a function of the analyzed data information that further includes at least a portion of the frequency error formed therein. A further step includes comparing the determined estimated frequency value to a predetermined threshold value. Another step includes using the determined estimated frequency value when the determined frequency value is greater than the predetermined threshold value to operatively control tracking mode electronic circuitry disposed in the satellite receiver to attain frequency lock on the received satellite RF signal.

主权项

1. A method to extend a frequency lock range of a received RF signal in a satellite receiver, comprising:
analyzing data information of a preamble associated with the received satellite RF signal by the satellite receiver, wherein the preamble is characterized by a total word length of the preamble, wherein analyzing data information includes identifying a first portion and a second portion of the preamble within the total word length of the preamble, wherein the first portion is distinct from the from the second portion; determining an estimated frequency value based on the first portion and the second portion; and using said estimated frequency value by the satellite receiver when the determined estimated frequency value is greater than at least one predetermined threshold value to operatively control tracking mode electronic circuitry disposed in the satellite receiver to attain frequency lock on the received satellite RF signal.