RECEIVER COMMON TO GPS AND GLONASS

摘要

PURPOSE: To realize frequency-conversion of an RF (high frequency) signal into an IF (intermediate frequency) signal without using a plurality of mixers. ;CONSTITUTION: RF GPS (Global Positioning System) and GLONASS (Global orbiting Navigation Satellite System) signals which are received by an antenna part 1 and high-frequency-amplified are converted into first IF signals by an image removing mixer 202. The oscillation frequency of a local oscillator 203 is set to be at the middle between the GPS carrier frequency and GLONASS carrier frequency. The mixer 202 separates the GPS signlas and GLONASS signals related to imaging against the local oscillation frequency while frequency-converting.;COPYRIGHT: (C)1995,JPO