S-mode Air Traffic Control Radar, Secondary Radar Data Chain Encoding And Decoding Method

The study of the current SSR system indicated that, with the continuing growth in thenumber of aircraft, the problems of fruit and garble would become limiting factors in theuse of SSR in an automated ATC system. The solution proposed was to interrogate aircraftindividually.Mode S system solves many of the system problems encountered with SSR Mode Aand Mode C. All the necessary data are contained in one reply and the accuracy of thereply data is confirmed by the parity.This paper describes the fields of the transmit message, and describes encoding anddecoding of the data-link and data parity. The designed circuit are described in detail.Finally, using emluator, we obtained the problem and shortage in the course of research.