| 摘要 |
The portable device ( 10 ) is used for determining horizontal and vertical positions. It includes a pressure sensor altimeter ( 15 ) calibrated to a predetermined initial altitude, a GPS signal receiver ( 12 ) arranged to receive, via an antenna ( 11 ), signals originating from several satellites ( 20 ) in order to calculate position data of the device, a processing unit ( 14 ) receiving the position data from the receiver ( 12 ) and an altitude value from the altimeter ( 15 ), and display means ( 16 ) for the horizontal and vertical positions of the device processed and provided by the processing unit. The processing unit sends the GPS receiver a signal corresponding to the altitude value of the calibrated altimeter to enable the receiver to determine, using the altitude value, the position data of the device. A memory ( 13 ) including cartographic data and associated with the GPS receiver ( 12 ) can provide the precise data to the processing unit ( 14 ) in particular for calibrating the altimeter.
|
