Abstract: A monitoring beacon which includes a ground base into which a telescopic mast is inserted. An intrusion detection and identification head is mounted on one end of said mast. The beacon also has solar panel support structures mounted pivotably on the ground base. During transport, the panel support structures are raised to form a protective cage around the beacon, while during use, the panel support structures are folded down flat around the base so that the mast and its detection head are no longer enclosed.

Abstract: A surveillance system includes presence detectors in a given area and an intruder identification system. The detectors are distributed among different mobile monitoring stations. A network is formed by the monitoring stations and a management unit which is designed to communicate with each of the monitoring stations and has software designed to automatically calculate the configuration to be given to the network which is to monitor the area and thus optimise the equipment used in each sector. The network configuration is calculated according to input data which include pre-recorded characteristics in the management unit and data that are at least partly provided by the monitoring stations once they are installed in the area.

Abstract: In an anticollision device, a moving object heading in a given direction along a movement vector and having a relative speed vector directed towards an obstacle is fitted out with at least two antennas sending out a microwave signal liable to be received by the obstacle. The device furthermore comprises reception means and means to analyze the echoes received from the obstacle, the analyzing means determining the variation with respect to time of the angle .theta. between the movement vector and the relative speed vector, a substantially zero variation of the angle .theta. indicating a risk of collision. Application to the equipment of motor vehicles to prevent collisions, notably in the event of poor visibility.

Abstract: The antenna is produced by placing radiating elements (70) in at least one of the spaces occupied by the various vehicle external lights. The radiating elements can be dipoles formed by metallizing the lens (43) which closes the headlight casing (40) and the casing itself can be used to reflect the electromagnetic energy forwards.

Abstract: A detection and localization system mounted on an airborne vehicle, and which enables detection of objects having at least one face inclined relative to the surrounding flat horizontal ground and therefore presenting a contrast with this ground. A radar transceiver is connected to an antenna rotating around the airborne vehicle and has a low directivity in a pitch plane and a high directivity in a roll plane, associated with a generator of distance cells. Making use of mathematical relations, an on-board computer, knowing the altitude of the airborne vehicle and the roll angle of the emitted radar wave, localizes the inclined face which produces a much higher reflection of the emitted radar wave than the surrounding ground, to thereby detect the inclined face.

Abstract: A device automatically measures a distance relative to the longitudinal axis of a runway to be destroyed. This device comprises: a radar transmitter-receiver, at least one depointed antenna, distance-measuring gates, a threshold circuit and a computer circuit.