在分析传统侦收船舶自动识别系统( AIS)信号严重依赖全球定位系统( GPS)不足的基础上，提出了一种改进的侦收算法，利用同步序列的实时相关运算实现AIS信号的检测并达到位同步，进而完成解调侦收。改进后的算法不再需要GPS系统的辅助，简化了设计降低了成本，在13 dB的信噪比下误包率可以达到5%以下。%Through analyzing the disadvantage of traditional automatic identification system( AIS) signal re-connaissance depending heavily on global positioning system( GPS) ,this paper presents an improved algo-rithm which realizes AIS signal detection and bit synchronization according to the correlation result of syn-chronisation sequence in real time, and demodulates AIS signal successively. The improved algorithm doesn′t need to use GPS,resulting in a more simplified design and a lower cost. The package error rate ( PER) is less than 5% at the signal-to-noise ratio of 13 dB.
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