收发系统的设计与实现是低频超宽带步进频率地表穿透雷达系统的关键技术之一。文中面向低空探地应用,着重讨论了超宽带脉冲步进频率雷达收发系统的参数设计、并行分时信号源的设计实现、收发系统射频凹口的设置和修复等几个问题。闭环一维距离像拼接结果表明,该收发系统具有体积小、重量轻、性能良好的特点,适合低空无人机载平台使用,为后续高分辨大范围SAR成像及浅埋目标探测等信号处理研究打下了良好的基础。

The design and implementation of the transceiver system is one of the key technologies of ultra-wideband stepped-frequency ground penetrating radar. In this paper, the parameters' selection of SFR (Stepped-Frequency Radar) transceiver system is introduced firstly. Then a pipelining structure of synthesizers is designed and realized. Finally, the methods of setting the frequency notch for RFI suppression and restoring the information of frequency notch are proposed. The performance of the transceiver system is validated by a range profile. The results show that with the characteristics of small valume, light weight and great performance, the transceiver system is suitable for unmanned aerial vehicle platform, offering a great foundation for SAR imaging with high resolution and wide surveillance area and shallow buried targets detection.

国家自然科学基金项目