| 摘要 |
PURPOSE: A car interface free navigation system with a backward compensation function is provided to correct a location error generated from a backward process of a vehicle and improve a complicated wiring of a navigation system. CONSTITUTION: An acceleration sensor(36) is used for measuring acceleration of a vehicle. A yaw gyro sensor(12) is used for measuring rotary angular velocity of a vertical axis to a road. A pitch gyro sensor(38) is sued for measuring rotary angular velocity of the vertical axis to a vehicle direction and the road. A sensor error correction portion(40) is used for correcting bias errors of the sensors(36,12,38) according to temperature. A yaw calculation portion(18) is used for calculating a moved yaw of the vehicle. A relative location calculation portion(23) is used for calculating a relative location of the vehicle. A GPS(Global Positioning System) receiver(20) is used for obtaining an absolute location from a multitude of GPS satellite. A stop state decision portion(44) is used for deciding a stopping state by using the acceleration sensor and the gyro sensors. A backward state decision portion(42) is used for a backward state by using a difference between a GPS heading and a DR heading. A location decision portion(24) is used for deciding a present location of the vehicle by using the absolute location and the decision of the backward state. A map memory portion(28) is used for storing map data. A control portion(26) is used for controlling all functions of a navigation system. A display portion(30) is used for displaying the map data and the location information.
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