| 摘要 |
In an automatized and accurate monitoring of the geographical positions of a number of movable units (6) position signals are used, which are transmitted from satellites (1). The units (6) receive the signals by means of stations (5) having antennas (7) arranged on the units (6) and the stations (5) calculate from the position signals the geographical position of the respective unit (6). The same is performed by a station (3), the correct geographic position of which is known and for instance is fixedly arranged. Further, this station (3) calculates the difference of the calculated geographical position and its correct geographical position and transmits information on the calculated difference to the stations (5) of the movable units (6). The stations (5) on the movable units (6) calculate by means of the received difference the correct geographical position of the movable units and transfer information thereof to the station (5) of at least one movable unit (6). In this unit the geographical positions of all the movable units (6) is collected and monitored. The information which is transferred between the different stations (3, 5) can be in coded form and thereby advantageously an intelligent memory card is used (35, 21). |
