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    • 10. 发明申请
    • IMPROVED VEHICLE NAVIGATION SYSTEM AND METHOD
    • 改进的车辆导航系统和方法
    • WO9724577A3
    • 1997-10-16
    • PCT/US9620849
    • 1996-12-27
    • ROCKWELL INTERNATIONAL CORPCROYLE STEVEN RSPENCER LARRY E IISITTARO ERNIE R
    • CROYLE STEVEN RSPENCER LARRY E IISITTARO ERNIE R
    • G01C21/00G01C21/28G01C21/30G01P21/00G01S5/14G01S11/10G01S19/14G01S19/23G08G1/0969G01C
    • G01C21/30G01C21/28G01S11/10G01S19/47G01S19/52
    • The improved vehicle navigation system and method uses information from a Global Positioning System (GPS) to obtain velocity vectors, which include speed and heading components, for 'dead reckoning' the vehicle position from a previous position. If information from the GPS is not available, then the improved vehicle navigation system uses information from an orthogonal axes accelerometer, such as two or three orthogonally positioned accelerometers, to propagate vehicle position. Because the GPS information should almost always be available, the improved vehicle navigation system relies less on its accelerometers, thereby allowing the use of less expensive accelerometers. The improved vehicle navigation system retains the accuracy of the accelerometers by repeatedly calibrating them with the velocity data obtained from the GPS information. The improved vehicle navigation system calibrates the sensors whenever GPS data is available (for example, once a second at relatively high speeds). Furthermore, the improved vehicle navigation system does not need to rely on map matching to calibrate sensors. System flexibility is improved because map matching is oblivious to the hardware, and the system hardware can be updated without affecting map matching or a change in the map database.
    • 改进的车辆导航系统和方法使用来自全球定位系统(GPS)的信息来获得速度矢量,其包括速度和航向分量,用于从先前位置“推测”车辆位置。 如果来自GPS的信息不可用,则改进的车辆导航系统使用来自正交轴加速度计(例如两个或三个正交定位的加速度计)的信息来传播车辆位置。 由于GPS信息几乎总是可用的,改进的车辆导航系统对其加速度计的依赖较少,从而允许使用较便宜的加速度计。 改进的车辆导航系统通过利用从GPS信息获得的速度数据重复校准加速度计来保持加速度计的准确性。 每当GPS数据可用时(例如,以相对高的速度每秒一次),改进的车辆导航系统校准传感器。 此外,改进的车辆导航系统不需要依靠地图匹配来校准传感器。 系统的灵活性得到了提高,因为地图匹配对硬件没有意义,系统硬件可以在不影响地图匹配或地图数据库变化的情况下进行更新。