Siemens Aktiengesellschaft

Otto Albersdoerfer

Gerhard Wagner

Wolfgang Kranz

Heinz Blankenfeld

Wolfgang Weckwerth

An interrogation-answering system is employed in conjunction with a primary radar wherein a single joint transmitter is utilized both for generating the interrogation signals and the simple primary radar signals.

Interrogation-answering system with a primary radar

Apparatus for combining an optical and laser system as, for example, in weapons systems where sighting an observation is to be employed and wherein the optical channel may be a sighting device such as a periscope and wherein the laser may comprise a laser transmitter for telemetry or for the purposes of Identification Friend or Foe. The transparent optical system transmits light wave energy and also includes the emission range of the laser transmitter. There are problems of mounting the two systems due to space limitations and in the present invention the output of the laser radiation into the optical system is accomplished by the use of optical fiber bundles which extend from the laser transmitter to the optical system. The emitting surface of the optical fiber bundle can be mounted so as to introduce into the optical system the laser energy at a favorable location and with small amounts of space and the optical bundle can couple the laser radiation directly into the optical system or through the use of a beam divider. In certain embodiments, an additional focusing lens system can be placed between the emitting surface of the optical fiber bundle or an autofocusing optical fiber bundle can be utilized.

Apparatus for combining an optical and laser system and including a

Identification -- friend or foe systems which utilize computer control continuously changing interrogation signals and responding signals have been developed. The signals are varied in a time dependent manner, however, it is possible that an intruder might intercept a proper responding signal and repeat the code of this responding signal, and thus confuse the interrogating station. The present system allows a responding signal to be used only once during a particular time interval so that an interrogating station will know that if an otherwise proper responding signal is received twice during a time interval, that the second signal is spurious.

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Feldafing, Germany

Otto Albersdoerfer