摘要
信道建模是研究临近空间通信技术、评估系统传输特性的基础和重要方法;临空飞行器从低速向高速发展,信道变化频次随飞行器速度增大而愈加频繁;为实现对临空通信过程中信道衰落的实时仿真,研制基于CPU+FPGA架构、参数1 ms更新一次的临空信道模拟器;该模拟器内置气象性损耗模型和无线信道衰落模型,CPU端通过设计状态机控制模块、优化参数计算逻辑、优化操作系统来压缩信道参数的计算时间;FPGA部分设计关键信息同步方案、基于状态机的双保障更新机制保证参数的可靠稳定传输、并行加速处理实现信息交互和增强信号处理速度;实测结果表明,上述方案有效提升了临空信道模拟器的参数计算速度和信号处理速度,可实现信道参数随收发机运动1 ms更新一次。
Channel modeling is the foundation and important method for studying near space communication technology and evaluating system transmission characteristics.Near space vehicles are developing from low speed to high speed,and the frequency of channel changes increases with the increase of aircraft speed.To achieve the real-time simulation of channel fading in near space communication processing,a near space channel simulator based on the CPU and FPGA architecture with the parameters updated once every 1 ms is developed.The simulator has the characteristics of the built-in meteorological loss model and wireless channel fading model.The calculation time of channel parameters in the CPU side is compressed by designing the control module of state machine,optimizing the parameter calculation logic,and optimizing the operating system.The key information synchronization scheme on FPGA is designed,the dual guarantee update mechanism based on the state machine is ensured the reliable and stable transmission of the parameters,the parallel acceleration processing is used to achieve the information exchange and enhance the signal processing speed.The actual test results show that the above scheme effectively improves the parameter calculation speed and signal processing speed of the near space channel simulator,which can achieve the channel parameters to be updated once every 1 ms with the movement of the transceiver.
作者
路辉
刘雪妍
LU Hui;LIU Xueyan(School of Electronic Information and Engineering,Beihang University,Beijing 100191,China)
出处
《计算机测量与控制》
2023年第11期286-292,298,共8页
Computer Measurement &Control
基金
国家自然科学基金(61827901)。
