| 摘要 |
PURPOSE: To provide a differential GPS system which can be sufficiently corrected against positional information even when a radio channel is used for another purpose. CONSTITUTION: On a base station side, an error predicting section 13 and positional information processing section 14 respectively prepare error predicting information and error information based on the output of a GPS receiver 12. The prepared two pieces of information are transmitted to a mobile station side through a transmitter 15. On the mobile station side, on the other hand, a receiver 16 receives the information and an error information preparing section 17 prepares error information. A positional information correcting section 18 corrects the positional information from a GPS receiver 19 based on the error information prepared by the section 17 and supplies the corrected positional information to a displaying section 20. |
