光子辅助四倍频W波段LFM信号感知测距
Photonics-Aided Quadruple Frequency W-Band Linear Frequency Modulated Signal Sensing and Ranging
潘龙威 1王演祎 1谭宇璇 1王源罡 1王凯辉 1周雯1
作者信息
- 1. 复旦大学通信科学与工程系和电磁波信息科学教育部重点实验室,上海 200433
- 折叠
摘要
提出了一种基于光学外调制器倍频产生W波段线性调频(LFM)信号并用于高分辨率测距的新方案.通过光调制器将来自任意波形发生器(AWG)的LFM信号调制到光载波的边带上,利用光电探测器(PD)拍频完成光电转换,从而产生四倍频W波段LFM信号,其中心频率与带宽均为原始LFM信号的四倍.发射上述宽带LFM信号对相距为50 cm的2个目标分别测距,测量结果为48.8 cm,误差为1.2 cm.为进一步验证实验的可靠性,调整2个目标的距离为40 cm,测量结果为38.9 cm,误差为1.1 cm.该系统克服了难以直接在电域产生高频信号的"电子瓶颈",通过光子辅助产生宽带LFM信号实现了高分辨率感知测距,为未来超高分辨率的线性调频连续波雷达系统提供了一种解决方案.
Abstract
A new system based on optical external modulator frequency multiplication is proposed to generate W-band linear frequency modulated(LFM)signals for high-resolution ranging.The LFM signals from the arbitrary waveform generator(AWG)are modulated to the sideband of the optical carrier through the optical modulator.The photoelectric conversion is completed in the photodetector(PD)to generate quadruple frequency W-band LFM signals,whose center frequency and bandwidth are four times the original LFM signal.This broadband LFM signal is emitted to free space for target detection.For distance measurements,the two targets are separated by 50 cm,and the measured value is 48.8 cm with an error of 1.2 cm.The distance between the two objects is set to 40 cm to demonstrate the reliability of the experiment.The measured value is 38.9 cm,and the error is 1.1 cm.The system overcomes the"electronic bottleneck"that is difficult to directly generate high-frequency signals in the electrical domain and achieves high-resolution ranging via photonics-aided generation of the broadband LFM signal.Thus,the proposed method provides a solution for future ultrahigh-resolution LFM continuous-wave radar systems.
关键词
微波光子学/雷达测距/光子辅助倍频/线性调频连续波/W波段Key words
microwave photonics/radar ranging/photonics-aided frequency multiplication/linear frequency modulated continuous wave/W band引用本文复制引用
基金项目
国家自然科学基金(61720106015)
国家自然科学基金(62127802)
出版年
2024
NETL
NSTL
万方数据