| 摘要 |
A vehicle (11) includes a mirror assembly (10) including components of a Loran positioning system (13). The mirror assembly may include an H-field antenna (44), receiver circuitry (45), a processor (50a), memory and a user interface (50b). The Loran system communicates received data with various other vehicle systems over a data bus (50c). Location data obtained from the Loran system is used to ascertain vehicle location, speed and heading. And to improve accuracy and availability of GPS data and to calibrate the vehicle compass and odometer. The accuracy of GPS position estimates is improved by combining data from both positioning systems. The GPS data is further improved by differential GPS (d-GPS) data received by the Loran positioning system and communicated to the GPS positioning system. The availability of the GPS is improved since less than four channels of satellite signals are needed when combined with the Loran signals. |
