The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 1992
Filed:
Jul. 12, 1976
Gerhard Wagner, Schaftlach, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
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.