| 摘要: |
| 针对传统数据链测试设备功能单一且不易重构的问题，借鉴虚拟仪器模块化的设计思想，设计实现了一种基于美国国家仪器公司（National Instruments，NI）通用软件无线电平台的数据链测试模拟器。该模拟器采用线性调频信号叠加（Sum of Linear Frequency Modulation,SoLFM）的方法高效产生具备连续相位的时变信道衰落，包括瑞利衰落、莱斯衰落和对数正态衰落等，并结合多相滤波思想能够精确模拟数据链长时延的多径传播场景。利用矢量网络分析仪对硬件模拟器输出的信道传递函数和信道冲激响应进行实测验证，并对各支路的随机信道衰落包络分布进行统计验证。实测结果表明，该数据链测试模拟器输出的信道函数和统计分布均与理论值吻合，因而可用于数据链装备的系统优化、验证和性能评估。 |
| 关键词: 数据链测试 通用软件无线电平台 线性调频叠加 虚拟仪器 信道衰落 |
| DOI： |
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| 基金项目:国家重大科学仪器设备开发专项(61827801);教育部产学合作协同育人项目（美国国家仪器公司201802016036）;研究生创新基地（实验室）开放基金（KFJJ20190418） |
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| A Novel Emulator Based on Virtual Instrument for Data Link Test |
| ZHANG Dongyang,YAO Changhong,HUANG Wenqing,ZHU Qiuming,YANG Yang,NING Benzhe |
| (1.Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space,Ministry of Industry and Information Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;2.China Airborne Missile Academy,Luoyang 471009,China) |
| Abstract: |
| For the problem that the traditional data link test equipment has a single function and is not easy to be reconfigured,this paper draws on the modular design concept of virtual instruments to design and implement a data link test simulation based on the Universal Software Radio Peripheral of National Instruments(NI) Corporation.The simulator uses the sum of linear frequency modulation(SoLFM) method to efficiently generate time-varying channel fading with continuous phases,including Rayleigh fading,Rice fading,and log-normal fading.The filtering idea can accurately simulate multipath propagation scenarios with long delays in the data link.A vector network analyzer is used to verify the channel transfer function and channel impulse response output from the hardware simulator,and statistically verify the random channel fading envelope distribution of each branch.The actual measurement results show that the channel function and statistical distribution output by the data link test simulator are in accordance with theoretical values,so it can be used for system optimization,verification and performance evaluation of data link equipment. |
| Key words: data link test universal software radio peripheral sum of linear frequency modulation virtual instrument channel fading |
《电讯技术》编辑部 