POSITION MEASUREMENT SYSTEM OF ON-VEHICLE GPS RECEIVER

摘要

PURPOSE:To carry on position measurement even if one satellite enters an unreceivable state by receiving signals from receivable satellites independently by many channels and selecting a specific number of satellites which are currently most suitable for the position measurement among all the satellites. CONSTITUTION:Multichannel constitution is provided with plural channels #1ch - #3ch each consisting of an antenna, an RF reception part, and a signal processing part. When reception is started, the respective channels #1ch - #3ch perform the inverse diffusion of satellite radio waves received by the antennas 1A - 1C at RF reception parts 2A - 2C respectively to receive all receivable satellites, channel by channel. Those are demodulated by signal processing part 3A - 3C and then sent to an arithmetic control part 4. Thus, a specific number of satellites which are most suitable for the position measurement at this time are selected among all the receivable satellites which are received by the channels #1ch - #3ch and the position measurement is carried out by using their navigation data. Therefore, even if a satellite in the position measurement becomes unreceivable, navigation data on another reception satellite is usable instead for the position measurement.