基于虚拟仪器的数据链测试模拟器研制

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。

A Novel Emulator Based on Virtual Instrument for Data Link Test

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.