Patent ID: 8654008
Filing Date: 2014-02-18
Classification: G01S

Abstract:
1. A method of providing automatic frequency control pull-in for receipt of GLONASS bits, the method comprising: determining, with a GLONASS receiver, whether a channel signal to noise ratio (CNo) is greater than or equal to a predetermined value; and when the CNo is greater than or equal to the predetermined value, performing pull-in using a first series of predetection integration periods (PDIs) with an integrator, and activating decision-directed flips (DDFs) until a 20 ms boundary of a GLONASS data bit is found, wherein the activated DDFs adjust polarities of a first value and a second value, which are provided by a real component generator and an imaginary component generator, respectively, based, at least in part, on an output of the integrator.