基于ARM+FPGA的多场景星载AIS系统设计与实现

Design and implementation of multi-scenario space-based AIS system based on ARM+FPGA

为了满足星载船舶自动识别系统（AIS）解调及碰撞信号分离算法对系统的需求,设计并实现多场景下能够模拟发射多种帧格式数据及碰撞信号的新型星载AIS信号模拟系统,为星载AIS系统的深入研究提供理论基础和技术前提。采用相位积分法实现信号的GMSK调制,采用一比特差分算法对自环接收的调制信号进行解调验证,并将算法集成在Cortex-A9ARM处理器及XC7K325TFPGA为核心的嵌入式硬件平台上,阐述在多场景下ARM数据管理单元中多线程的开发步骤,以及FPGA逻辑处理单元中多场景基带数据帧调制模块和自环接收解调模块的实现方法。通过实际测试得到系统误码率稳定在0.57‰-1.32‰,验证多场景下星载AIS信号模拟系统的有效性和可行性,具有明显的应用价值。

In order to meet the requirements of the demodulation and collision signal separation algorithm,a space-based automatic identification system（AIS）signal simulation system which is capable of transmitting the signal of multiple frame format and collision signal is designed and implemented under multi-scenario.The signal simulation system provides theoretical basis and technical premise for the in-depth research of space-based AIS system.The GMSK modulation is realized by phase integration method.The modulated signal from the loopback is demodulated by the algorithm of one-bit differential demodulation.The algorithm is integrated into Cortex-A9 ARM and XC7 K325 T FPGA.This paper describes the steps of multithreading in the ARM data management unit under multi-scenarios and the realization method of modulation module and demodulation module in the FPGA logic processing unit.The system error rate is between 0.57‰ and 1.32‰,which verified the validity and feasibility of the multi-scenario AIS signal simulation system.The system has obvious application value.