基于GNU Radio的ADS-B信号收发系统设计

针对高集成度ADS-B系统不易开展创新性研究的问题，基于软件无线电设计了一套ADS-B信号收发系统。首先以可修改形式实现ADS-B报文编码、基带信号生成、前导脉冲检测、信号解调以及ADS-B信息解码等自定义GNU Radio模块的编写；然后创建ADS-B发射机和接收机流图，驱动硬件外设HackRF实现ADS-B信号的发射与接收；最后通过实验对各模块功能及数据接口进行测试。实验结果表明，该系统设计方案可行，ADS-B信号格式及报文广播速率符合Do-260B标准，且ADS-B接收机接收灵敏度为-68dBm，信号检测率达89%。

Design of ADS-B Signal Transceiver System Based on GNU Radio

In view of the difficulties in conducting innovative researches on highly integrated automatic dependent surveillance-broadcast (ADS-B) experimental platform, an ADS-B signal transceiver system was designed based on software defined radio platform. First, self-defined GNU Radio blocks named ADS-B encoder, baseband signal generation, preamble detection, ADS-B demodulator and ADS-B decoder were written in modifiable form. Then flow-graphs of ADS-B transmitter and receiver were created to realize the transmission and reception of ADS-B signal by using HackRF, which is a software defined radio peripheral. Finally, experiments were carried out to test the function and interface of each block. The results show that the design scheme is feasible, ADS-B signal format and message broadcast rate are compliant with the Do-260B standard. The receiver sensitivity is -68 dBm, and signal detection rate reaches 89%.