星载AIS信号的相干接收

Coherent reception of satellite-based AIS signal

针对星载AIS(船舶自动识别系统)接收系统覆盖范围广及运动速度快等特点,以及现有的非相干算法存在不足,提出一种相干接收方案。首先分析星载AIS信号的特点;然后介绍相干接收方案的结构,并详细论述各部分的解决方案;最后在Simulink中实现星载AIS信号的发射和接收仿真系统,验证接收系统的误码性能。仿真实验表明,此接收系统能有效提高抗噪声能力和抗干扰能力,解决非相干系统抗干扰能力不足的问题,有一定的工程应用价值。

According to the characters of the satellite-based AIS（Automatic Identification System） receiver with wide coverage and fast moving speed,as well as the defact of existing non-coherent algorithm,a coherent reception scheme is proposed. Firstly, the characters of the satellite-based AIS signal was analyzed,then the structure coherent reception scheme was introduced, and the various parts of the solution was discussed in detail.Finally some simulations and experiments based on AIS transmitter and receiver are presented to verify the performance on the Simulink simulation model.The simulation results show that the devised receiver with a grate value in engineering has an excellent performance in terms of enhanced sensitivity to noise floor,excellent resilience to interference over the non-coherent system.