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This essay targets multiple access interference environment which is unclear to the PN sequence and investigates the reinforcing acquisition method of direct spread spectrum signal.This essay also puts forward peak position detection-based acquisition method of multi-access interference removal resistance,achieves the position information of cross-correlation interference with multi-peak characteristics through multiple detection decision,so as to remove the multi-access interference.Meanwhile,the frequency feature of the pseudo code correlation results is applied to reduce the false alarm probability through multi-frequency joint detection.Both theoretical analysis and simulation results have verified the effectiveness of this method.