| 摘要 |
<p>Alarm system for mobile objects comprising a receiver station, a navigation unit located at the mobile object and operable to determine the position of the object, a radio telephone type transmitter unit to be located on the mobile object and operatively connected to the navigation unit, the transmitter unit being operable to transmit signals receivable by the receiver station and indicative of the instantaneous position of the object as determined by the navigation unit. The navigation unit is operable to continuously or after pre-set time intervals to determine the instantaneous position of said mobile object, compare the instantaneous position with at least one predetermined position, and in case of difference between the instantaneous position and said predetermined position to activate the transmitter unit to transmit the instantaneous position to the receiver station, preferably a mobile telephone.</p> |
