一种双通道星载AIS接收机研究

The Research of A Double Radio-route Satellite AIS-Receiver

针对地面AIS设备覆盖范围有限,无法满足远洋航运船舶对AIS技术的迫切需求,提出了一种可搭载于低轨卫星的双通道星载AIS接收机,首先,针对低轨卫星的工作平台,分析了星载AIS接收机的链路、灵敏度指标和多普勒频移,得到了在低轨卫星平台上对AIS接收机的增益指标要求和面对的难题,由此开展了星载AIS接收机的方案设计,对其组成架构、硬件平台和解调算法进行了介绍,提出了一种双通道AIS接收机,可同时解调四个频道,硬件平台采用了可重构的思路,对AIS信号的解调算法进行了简单阐述。对工程实现产品进行了地面灵敏度指标测试,并搭载卫星在轨接收数据。结果表明双通道同时覆盖四频道的设计,增加了AIS信号的接收数据量,并且可重构的软硬件平台和先进的解调算法,降低了硬件开销,提高了可靠性,为星载AIS技术发展提供了参考。

The limited area ground AIS device covered can’t satisfy the urgent need of ocean-going ships.In order to solve this problem,a double radio-route AIS-Receiver can piggybacked by LEO satellite is brought up.First,the link between satellite and ships,the receive sensitivity of AIS-Receiver and the Doppler shift are analyzed to acquire the gain of AIS-Receiver and the difficulty wait to be solved.Then a AIS-Receiver proposal apply to LEO satellite is put forward which can demodulate four channel at the same time and choose the reconfigurable methods to design the hardware platform,also,the demodulation algorithm is introduced briefly.An engineering AIS-Receiver was accomplished to test the receive sensitivity on the earth and be carried by a LEO satellite launched to space.The results suggest that the double radio-route design covered four channel increase the date received by AIS-Receiver.the reconfigurable hardware platform and the advanced demodulation algorithm can cut down the cost of hardware,improve the reliability.It can provide referemce to the progress of AIS technology.