全阴影卫星信道高效硬件数字孪生方法  

An Efficient Hardware Digital Twin Method for Full-Shadow Satellite Channel

作　　者：房晨 赵子坤 张宁 柳涛 朱秋明[1] 毛通宝 毛开 Fang Chen;Zhao Zikun;Zhang Ning;Liu Tao;Zhu Qiuming;Mao Tongbao;Mao Kai(The Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;State Radio Monitoring Center Urumqi Monitoring Station,Urumqi 831400,China)

机构地区：[1]南京航空航天大学电磁频谱空间认知动态系统工业与信息化部重点实验室,南京210016 [2]国家无线电监测中心乌鲁木齐监测站,乌鲁木齐831400

出　　处：《航空兵器》2022年第3期88-93,共6页Aero Weaponry

基　　金：国家重大科研仪器研制项目(61827801);江苏省自然科学基金项目(BK20211182)。

摘　　要：卫星信道的硬件数字孪生技术是卫星通信场景中物理层或数据链路层通信性能评估的重要手段,本文提出了一种适用于全阴影卫星信道的硬件实时模拟架构。首先,基于现场可编程门阵列(Field Programmable Gate Array,FPGA)平台,设计了一种基于迭代算法的复高斯序列产生方法。然后,基于坐标旋转数字计算(Coordinate Rotation Digital Computer,CORDIC)算法实现了幂指数与平方根函数的硬件计算,并结合时分复用思想研制了全阴影卫星信道衰落模拟器。与传统查找表(Look Up Table,LUT)方法和CORDIC算法相比,复高斯序列产生模块的资源消耗率分别降低了6.21%和5.23%。硬件测试结果表明,信道模拟器输出的衰落统计特性如概率密度函数与理论结果吻合,并且不同类型卫星信道多普勒形状也与理论结果符合,可用于全阴影卫星信道的硬件模拟。The hardware digital twin technology of satellite channel is an important way to evaluate the communication performance of physical layer or data link layer in satellite communication scene.A hardware real-time emulation architecture for full-shadow fading satellite channel is proposed in this paper.Firstly,based on the field programmable gate array(FPGA)platforms,a complex Gaussian sequence generation method based on iterative algorithm is designed.Then,based on the coordinate rotation digital computer(CORDIC)algorithm,the hardware calculation of exponential function and square root function is implemented.Combined with the idea of time division multiplexing(TDM),a full-shadow satellite channel fading emulator is developed.Compared with the traditional look up table(LUT)method and CORDIC algorithm,the hardware resource consumption of the complex Gaussian sequence generation method is reduced by 6.21%and 5.23%,respectively.The hardware test results show that the fading statistical characteristics of emulated channel such as probability density function agree well with the theoretical results,and the Doppler shapes of different satellite channels also agree with the theoretical results,which verifies that it can be used for the hardware emulation of full-shadow fading satellite channel.

关 键 词：全阴影衰落 卫星信道模型 硬件数字孪生 FPGA CORDIC 

分 类 号：TJ760[兵器科学与技术—武器系统与运用工程] V324.24[航空宇航科学与技术—人机与环境工程]