Daimler Chrysler Ag

Deutsche Aerospace Ag

Daimlerchrysler Aerospace Ag

Tiang-Gwan Liem

Franz-Xaver Hofele

Wilhelm Gruener

Norbert Fuchter

Klaus Solbach

Wilhelm Gruner

The invention relates to a system for identifying targets as a friend or foe, which is operated in the millimeter-wavelength range by means of an interrogator and a transponder, with the interrogator and the transponder having essentially the same electronic assemblies and operating in essentially the same middle transmitting and receiving frequency, and with a large frequency difference between the two being tolerable. The interrogator operates with a directional transmitting/receiving antenna, whereas the transponder possesses an omnidirectional transmitting/receiving antenna.

Method of identifying a target as a friend of foe, and arrangement for

A phased-array antenna, particularly for the radar frequency range, comprising at least a predetermined number of transmit/receive radiator elements arranged linearly and/or matrix-shaped, a power distribution as well as a phase shifter network and a transmit/receive change-over arrangement. The transmit/receive change-over arrangement includes a serial feed comprising a waveguide with coupling in/coupling out locations disposed along its length and to which the phase shifter network, and possibly a further power distribution network, is coupled and also the transmitting/receiving arrangements are coupled. With this arrangement, an otherwise needed transmit/receive switch, for example, a circulator, is not necessary.

Phased-array antenna

Method of monitoring an area, and a device for carrying out the method

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Ulm, Germany

Tiang-Gwan Liem