The Effect of Masking Interference on the Quality of Request Signal Detection in Aircraft Responders of the Identification Friend or Foe Systems

The principle of building a network of survey IFF systems, the principle of servicing request signals in an aircraft responder, as well as the presence of a significant number of information facilities operating in the frequency range of IFF systems predetermined the presence of significant flows of intra-system and intentional correlated and uncorrelated interference of significant intensity both in the request channel and response channel. The use of primitive time-domain and positional codes as request signals predetermined the low noise immunity of IFF systems when exposed to masking interference in the request channel due to the need to expand the receiver bandwidth significantly higher than the bandwidth of the request signals used. The paper evaluates the influence of masking interference on the quality of detection of request signals in aircraft responders. It is shown that the expansion of the bandwidth of the receiver of the aircraft responder leads to additional losses in the signal-to-noise ratio, as a consequence to a decrease in the noise immunity of the considered information systems.