非周期直扩信号PN码盲估计

Because of its strong anti-interference ability, low probability of interception and signals of good concealment,Direct sequence spread spectrum communication are widely used in military confrontation. In order to solve the enemy information and interfere with the enemy information, PN sequence is estimated at first. Because of the non repeatability of the spreading sequence and poor correlation between adjacent codes,non-periodic direct sequence spread spectrum(Direct Sequence Spread Spectrum, DSSS) signals is detectd more difficultly.under non-cooperation and non-synchronization, based on known information rate, period of PN and chip rate, the subspace tracking for pseudo noise sequence estimaion of non-periodic DSSS signals is researched . The algorithm avoids the high complexity of computation, and can realize the estimation of PN codes at lower snr.