SATELLITE SIGNAL TRACKER AND SATELLITE SIGNAL RECEIVER WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a satellite signal tracker having the S/N ratio improved by extending the coherent addition time of the tracking means, continuously monitoring the signal tracking state, enabling retaining of synchronization, and capable of suppressing increase of the circuit size and current consumption.;SOLUTION: In the Costas loop, its carrier frequency control signal is corrected by extending the coherent addition time to the period of navigation data from a satellite, converting the I and Q correlation signals into multiple nominated frequencies, performing coherent and non-coherent additions on each of the nominated frequencies, and continuously calculating frequency deviations from a signal power distribution.;COPYRIGHT: (C)2008,JPO&INPIT