"FRIEND-OR-FOE" IDENTIFICATION SYSTEM Russian patent published in 2002 - IPC

FIELD: radio engineering, applicable for determination of the national status of flying objects (aircraft, spacecraft) and their identification. SUBSTANCE: known "friend-or-foe" identification system, having an interrogator located on the Ground, and a transponder positioned on the flying object, additionally uses elements and the respective communications between them making it possible to produce a random interrogation signal and an expected reply signal coded by a password and a coding device in the interrogator, compare the received reply signal with the expected one and take a decision "friend" or "foe", and in the transponder - to produce a reply signal according to the received interrogation signal, as well as to fulfil the function of the interrogator, which ensures the solution of the identification problem between the movable objects. EFFECT: expanded functional capacities and enhanced simulation stability of the system. 10 dwg