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AV NAVIGATION SYSTEM AV-197 < SYSTEM DESCRIPTION > [PREMIUM WITH NAVIGATION] C D E F G H I J K L M B A O P NAVIGATION SYSTEM System Diagram INFOID:0000000006166557 System Description INFOID:0000000006166558 NOTE: Refer to NAVI System Owner's Manual for system operation. The navigation system periodically calculates the vehicle's current position according to the following three signals: Travel distance of the vehicle as determined by the vehicle speed sensor, turning angle of the vehicle as determined by the gyroscope (angular velocity sensor), and the direction of vehicle travel as determined by the GPS antenna (GPS information). The current position of the vehicle is then identified by comparing the calculated vehicle position with map data read from the map DVD-ROM, which is stored in the DVD-ROM drive (map-matching), and indicated on the screen with a current-location mark. By comparing the vehicle position detection results found by the GPS and by map-matching, more accurate vehicle position data can be used. The current vehicle position will be calculated by detecting the dis- tance the vehicle moved from the previous calculation point and its direction. TRAVEL DISTANCE Travel distance calculations are based on the vehicle speed input signal. Therefore, the calculation may become incorrect as the tires wear down. To prevent this, an automatic distance fine adjustment function has been adopted. TRAVEL DIRECTION Change in the travel direction of the vehicle is calculated by a gyroscope (angular velocity sensor) and a GPS antenna (GPS information). As the gyroscope and GPS antenna have both merit and demerit, input signals from them are prioritized in each situation. However, this order of priority may change in accordance with more detailed travel conditions so that the travel direction is detected more accurately. AWNIA1625GB SEL684V |