Свид, І. В.Обод, І. І.Мальцев, О. С.2021-06-042021-06-042021I. Svyd, I. Obod and O. Maltsev, "Interference Immunity Assessment Identification Friend or Foe Systems", In: Ageyev D., Radivilova T., Kryvinska N. (eds) Data-Centric Business and Applications. Lecture Notes on Data Engineering and Communications Technologies, vol 69. Springer, Cham, pp. 287-306, 2021. doi: 10.1007/978-3-030-71892-3_12.978-3-030-71892-3978-3-030-71892-3https://link.springer.com/chapter/10.1007%2F978-3-030-71892-3_12https://doi.org/10.1007/978-3-030-71892-3_12https://openarchive.nure.ua/handle/document/16325In the work, based on the consideration of the place and role of Identification friend or foe (IFF) systems in the airspace control system, it is shown that the principle of building modern IFF systems in the form of an asynchronous network for transmitting request and response signals and the implementation of the principle of servicing request signals based on an open single-channel queuing system with refuses, as well as the use of primitive coding of request signals and response signals do not allow an acceptable level of information support for the air control space and air traffic control in conditions of significant intensities of intra-systemic, as well as deliberate correlated and uncorrelated interference. A general description of the considering information systems is given and a brief description of the signals used in IFF systems is given. Based on the presentation of IFF systems in the form of two-channel systems for transmitting request and response signals, the noise immunity of aircraft re-sponders is evaluated under the action of request signals and intentional as well as unintended (intrasystem), correlated and uncorrelated interference in the request channel, which made it possible to evaluate the noise immunity of the entire IFF system in the form estimates of the probability of detection of airborne objects by the considering system.enIdentification Friend or FoeAircraft responderRequest signalChaotic impulse noiseAir objectMonograph