基于RTL-SDR的低成本软件接收机设计与实现

Design and Implementation of Low Cost Software Defined Radio Receiver Based on RTL-SDR

目前大部分软件无线电硬件平台均价格昂贵，为此，本文基于一种低成本的硬件平台-RTL-SDR，完成了FM软件接收机的设计与实验验证。首先对软件无线电和RTL-SDR原理进行研究，解决了RTL-SDR晶振不稳定、频偏大的问题，并在此基础上设计了一个基于RTL-SDR的FM软件接收机；然后在GNURadio中完成系统搭建和配置；最后对实际FM信号进行接收处理。实验结果表明，本文设计的FM软件接收机能够很好地处理FM广播信号，对软件无线电技术的实际应用具有一定参考价值。

Since most software defined radio （SDR） hardware are expensive, a low cost SDR receiver of FM based on RTL- SDR is designed and certificated by experiment in this paper. Firstly, the SDR and working principles of RTL-SDR are analyzed, and then problems of crystal oscillator instability and large frequency offset of RTL-SDR are solved. At last, the FM receiver based on RTL-SDR is designed and configured in the context of GNU Radio, and actual FM radio signals are received and pro- cessed. The results indicate that the designed receiver can process FM signal well, and the designing can provide reference for practical application of SDR technology.