Improvement on algorithm of confidence declaration of mode s second surveillance radar

Mode S Second Surveillance Radar (SSR) is very important means for Air Traffic Control (ATC) now and future, all the responding data which the radar receives need parity processing. Bit and confidence declaration is an vital step before error detection and error correction. Based on the commonly used baseline multi-sample algorithm, different conditions are presented and analyzed, the conditions under which error happens are pointed out, and the algorithm in which two statistical variables are added to avoid false declara-tion. In addition, the moving average method is used to preprocess the sampled data, so as to reduce the in-fluence of noise. The merits the baseline multi-sample technique owes are preserved, and the added computa-tion is small. The declaration veracity is improved, and consequently makes error detection and error correc-tion be facilitated successfully.