Abstract: Method and apparatus for determining the position of a mobile vehicle with a receiver, through a triangulation based on angular data obtained by processing directive electromagnetic signals emitted by fixed rotating transmitters. The method includes: dividing the 360.degree. of the rotation into 2.sup.n angular values; generating a coding sequence of 2.sup.n binary configurations made up of 2.sup.n +(n-1) bits; generating a coding pattern wherein said angular values are coded; storing said coding pattern in the transmitters and in the receiver; starting the rotations of the two transmitters at a correlated, constant speed; transmitting the angular data corresponding to the direction of emission of the beams; demodulating the signals detected by the receiver and obtaining the coded angular values; and calculating the vehicle position by using the latest mean angular values obtained from the signals.

Abstract: Apparatus for automatically distributing communications between users and a fleet of mobile stations through a central station including a telephone exchange (1), a plurality of telephone answering modules (3) provided with a phone numbers data-bank and connected between said exchange (1) and a LAN net (4), and a pair of central processing modules (5, 5') connected to said LAN net (4) and to a plurality of radio transmission interface modules (6), each of these controlling a receiving radio (7) and a transmitting radio (8). Each mobile station includes a radio transceiver provided with a keyboard and a display, a localizing device, and a local processing module controlling the operation of the mobile station and containing a clock provided with a clock time controller.