基于软件无线电的LFM测距测速实现

Implementation of Linear Frequency Modulation Ranging and Speed Measurement Based on Software-Defined Radio

软件无线电是一种无线电通信系统,它通过软件来实现和控制无线通信功能,而不是传统的硬连线方式。本实验仿真所用到的SIMULINK在工程计算、数据分析和可视化方面进行应用。本研究目的是探索线性调频信号在SIMULINK仿真、软件无线电系统中的应用。文章首先对线性调频信号进行采样,随后进行发射,软件无线电接收的信号与原线性调频信号进行混频、和快速傅里叶变换,最后引入测距测速原理,通过信号变化和已知频谱移动信息,令仿真具有测距测速功能,测试系统的实际工作性能。Software defined radio is a wireless communication system that utilizes software to implement and control wireless communication functions, rather than traditional hard wired methods. The SIMULINK used in this experimental simulation is applied in engineering calculations, data analysis, and visualization. The purpose of this study is to explore the application of linear frequency modulation signals in SIMULINK simulation and software defined radio systems. This article first samples the linear frequency modulation signal, and then transmits it. The signal received by the software defined radio is mixed with the original linear frequency modulation signal and subjected to fast Fourier transform. Finally, the principle of ranging and speed measurement is introduced. Through signal changes and known spectral shift information, the simulation is equipped with ranging and speed measurement functions to test the actual performance of the system.