CAR NAVIGATION SYSTEM AND DOWN CONVERTER IC TO BE USED FOR CAR NAVIGATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a car navigation system capable of reducing power consumption by reducing the scale of antenna wiring and a circuit scale by integrating a GPS and a VICS receiver and also evading the simultaneous usage of them. SOLUTION: The car navigation system comprises: a down converter IC 50 connected with the GPS/VICS integrated antenna 1; an optical transmission reception part 17 connected with the optical antenna 2; a coordinate information memory 21 previously stored with the information of on-road facilities; a controller 20; and a GPS/VICS switch 6 in the down converter IC 50. The controller 20 switches the signal to evade the simultaneous use and so reduce power consumption. COPYRIGHT: (C)2006,JPO&NCIPI