Sun Yifei, Chen Yongchao, Tang Longhuang, Jia Xing, Ma Heli, Wang Xiang, Chen Long, Liu Shenggang, Tao Tianjiong, Wu Jian, Li Chengjun, Liu Shuanyu, Chen Weilu, Gu Wei, Shi Jia, Weng Jidong
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 622150, China.
Tianjin Key Laboratory of Optoelectronic Detection Technology and System, School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China.
Sensors (Basel). 2024 Dec 25;25(1):58. doi: 10.3390/s25010058.
An ultrafast microwave ranging method based on optically generated frequency-modulated microwave pulses is proposed in this study. The theoretical analysis demonstrated that nanosecond-scale linear frequency modulation microwave pulse can be obtained by femtosecond laser interference under the condition of unbalanced dispersion, which can be used to achieve a high temporal resolution of the displacement change in the measurement by the principle of frequency modulation continuous wave (FMCW) radar. The proof-of-principle experiment successfully measured the displacement change with an error of 2.5 mm and a range of 0.6 m, with a response time of 468 ns. Compared to existing microwave ranging technologies, the temporal resolution was improved by two orders of magnitude, which greatly improves the temporal resolution of distance measurement in the field of microwave FMCW radar.
本研究提出了一种基于光生调频微波脉冲的超快微波测距方法。理论分析表明，在色散不平衡的条件下，飞秒激光干涉可产生纳秒级线性调频微波脉冲，利用调频连续波（FMCW）雷达原理可实现测量中位移变化的高时间分辨率。原理验证实验成功测量了位移变化，误差为2.5毫米，量程为0.6米，响应时间为468纳秒。与现有微波测距技术相比，时间分辨率提高了两个数量级，大大提升了微波FMCW雷达领域距离测量的时间分辨率。
