method and device for avoiding the pitfalls and disparities or erroneous answers in ffi systems

摘要

The IFF (Identification of Friend or Foe) false message prevention interrogation system has a system programmed in a national mode and interrogated in a second mode. The interrogation structure is the same, but the cypher key is different for the interrogation mode. To overcome this, there is a step where the interval of time between the end of the header and the start of the information block is modified.