POSITIONING SIGNAL RECEIVER

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive positioning signal receiver comprising a movable body detection function.

SOLUTION: In this positioning signal receiver 10, a positioning antenna 12 receives a positioning signal from a positioning satellite. A local oscillator 26 generates a local oscillation signal. A detection antenna 34 emits the local oscillation signal while receiving a reflection signal of the emitted local oscillation signal. A mixer circuit 16 generates an intermediate frequency signal by mixing the input signal and the local oscillation signal. A positioning antenna power supply control part 44 and a switch control part 46 switch signals to be input into the mixer circuit 16 as the positioning signal or the reflection signal. A location calculation part 48 determines location of the positioning signal receiver 10 based on the intermediate frequency signal output when the positioning signal be input into the mixer circuit 16. A movable body detection part 50 detects a movable body near the positioning signal receiver 10 based on the intermediate frequency signal output when the reflection signal be input into the mixer circuit 16.

COPYRIGHT: (C)2008,JPO&INPIT