IFF determines the response properties of the target to identify friend or foe through question and answermechanism, and nowadays it plays an important role in the modern information warfare. This paper introduces the transponderdigital processing system in the new type of IFF, specially including the processing method of receiving andtransmitting in MOD5 and the theory of basic MSK modulation, maximum likelihood Viterbi demodulation and Walshspreading and despreading, discussing the shortage of maximum likelihood Viterbi demodulation, then proposing theweighted MSK demodulation and despreading algorithm and joint demodulation and despreading algorithm based on theimproved maximum likelihood Viterbi demodulation algorithm. The joint demodulation algorithm is more outstandingthan the maximum likelihood Viterbi demodulation algorithm according to simulation.
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