| 摘要 |
<P>PROBLEM TO BE SOLVED: To simultaneously acquire a plurality of candidate local frequencies while suppressing the increase of a circuit size. <P>SOLUTION: The satellite signal receiver includes: a local carrier NCO3 for generating a center local frequency as a candidate; a Doppler carrier NCO4 for generating a Dopper frequency as a candidate; a candidate frequency adder-subtractor circuit 5 for receiving the output of the local carrier NCO3 and the output of the Doppler carrier NCO4 to generate three or more candidate local frequencies; and integrators 80 to 84 for performing correlation calculation between diffusion codes from a code generator 21 and a plurality of candidate local frequencies from the candidate frequency adder-subtractor circuit 5 for an input IF signal. The candidate frequency adder-subtractor circuit 5 includes: a frequency multiplication circuit 51 for multiplying the output frequency of the Doppler carrier NCO4; and adders-subtractors 521 to 524 for adding or subtracting an output from the frequency multiplication circuit 51 to or from the output of the local carrier NCO3 to output the plurality of candidate frequencies. <P>COPYRIGHT: (C)2013,JPO&INPIT |
