一种新的星载AIS帧头检测算法及FPGA硬件实现

针对星载AIS时延和频偏大引发的信号同步问题,提出了一种新的基于差分相位波形匹配的帧头检测算法.理论分析了 AIS帧中训练序列和开始标志部分信号的相位特征,使用专门的匹配算法对帧头进行检测.进行了仿真验证并在FPGA上进行了实现.该算法抗频偏性能极佳,且在低信噪比下仍有较高的检测率以及较低的误帧率和极低的虚警率.仿真结...

Satellite-Based AIS Signal Frame Synchronization Based OnDifferential Phase Waveform Matching and FPGA implementation

To solve the signal synchronization problem caused by the wide range of time delay and frequency shift of the satellite-based automatic identification system (AIS), a new frame header detection algorithm based on differential phase waveform matching is proposed. The theoretical analysis of the phase characteristics of the signal of the training sequence and the start flag in the AIS frame structure, and the use of a specific matching algorithm to detect the frame header. The simulation results show that the algorithm has good properties in frequency shift resistance, and has a high detection rate, low frame error rate, and false alarm rate under low SNR. Compared with other algorithms, the computational complexity proposed in this article is very low, and the hardware resource consumption of FPGA is low.