Based on analysis on the generation mechanisms of auto - correlation peaks , acm is combined with average technique in correlation domain . average technique not only smoothes noise correlation lines , but also makes all potential positions of generating auto - correlation peaks generate auto - correlation peaks of dsss / bpsk signal . the improved acm obtain lower snr limitation successfully 在分析時(shí)域自相關(guān)法相關(guān)峰出現(xiàn)機(jī)理的基礎(chǔ)上,將該法與相關(guān)域迭加平均技術(shù)結(jié)合,既平滑了噪聲又使各延遲時(shí)間為擴(kuò)頻碼整數(shù)倍周期處均出現(xiàn)相關(guān)峰,實(shí)現(xiàn)了更低信噪比下的碼周期估計(jì)。