| 摘要 |
An IFF system comprises an interrogation device having an antenna arrangement operating in the HF or microwave range with a relatively broad radiation characteristic for radiation of coded interrogation pulses and for receiving answer signals. The IFF system cooperates with a position finding device whose transmission pulses are radiated by way of a relatively narrow radiation lobe and wherein the answer signals are triggered in the answering device in response to the arrival of transmission pulses of the position finding device. A pulse laser operating in the optical range and having a very narrow radiation lobe at the transmission radiator is used as the position finding device and an answer signal is only triggered in the answering device with the aid of a control circuit when the transmission pulse of the laser transmitter arrives in a certain section during the interrogation pulse produced by the interrogation transmitter, the duration of the interrogation pulses being essentially greater than the duration of the transmission pulses.
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