基于CRC校验的星载AIS系统接收机

CRC check design in the satellite-based AIS system

为了提升星载船舶自动识别系统(Automatic Identified System)的接收性能,文中提出了一种改进的星载AIS接收机方案。针对多路信号冲突的情况,研究了采用联合维特比解调(JMLSE)算法的AIS接收机误比特特点,选取合适的2比特CRC纠错算法进行纠错,改善信号解调性能。文中针对两路信号冲突情况,在不同功率比、相对时延和频偏条件下进行方案性能仿真。结果表明,使用2比特CRC纠错算法的星载AIS接收方案能够有效降低接收机误包率。

In order to improve the receiving performance of satellite-based automatic identification system( AIS),this paper presents an improved AIS receiver scheme. In the case of multi-signal collision,the error data packets are recovered by 2-bit CRC error correction module. The performance of two signal streams in different power ratio,different relative time delay and different frequency offset is simulated.The results show that the error rate of the received package can be reduced effectively by using the improved AIS receiving scheme.