激光与光电子学进展, 2021, 58 (3): 0306003, 网络出版: 2021-03-12   

雷达线性调频信号产生与去啁啾方法研究 下载: 868次

Generation and Dechirping of Linear Frequency Modulation Signals
作者单位
内蒙古大学电子信息工程学院,内蒙古 呼和浩特 010021
摘要
提出了一种新的雷达系统线性调频信号产生与去啁啾的微波光子学方案。雷达发射端利用双平行马赫-曾德尔调制器产生4倍频的抑制载波双边带信号,利用光纤光栅将信号的两边带分离后分别进行循环相位调制,最后由光电探测器光电转换产生8倍频的线性调频信号。接收端利用发射端产生的中间信号将回波信号进行相位调制,滤出载波与含有回波信息的一阶边带拍频,得到1个单频信号,完成回波信号的去啁啾。经仿真分析并验证,使用10 GHz的射频信号,幅度为1、宽度为10 ns的抛物线信号,生成了中心频率为80 GHz、带宽为32 GHz、时间带宽积为320的线性调频信号,并详细验证了可调谐性能及压缩性能,生成时间带宽积为480、640、3200等的线性调频信号。在接收端完成了时延为1.0 μs、0.9 μs等回波信号的去啁啾,对应的探测距离为150 m、135 m等。方案结构紧凑,具有很好的可重构性。
Abstract
A new photon scheme for linear frequency modulation (LFM) signal generation and dechirping is proposed. In the proposed scheme, at the radar transmitter, a double-parallel Mach-Zehnder modulator is used to generate quadruple frequency suppression carrier double-sideband signal. The two sidebands are separated after the fiber grating and modulated by a cyclic phase, and the octave frequency LFM signal is generated by photoelectric conversion through a photodetector. At the receiving end, the echo signal is phase-modulated, the carrier wave and the first-order sideband containing the echo information are filtered through a filter, and the beat frequency is realized to obtain a single-frequency signal. Thus, the dechirp processing of the echo signal is completed. In the analysis and verification by Optisystem, the frequency of the radio frequency signal was set to 10 GHz, the amplitude of the parabolic signal was 1, and the width of the parabolic signal was 10 ns. An LFM signal with a center frequency of 80 GHz, bandwidth of 32 GHz and time bandwidth products of 320 was generated. The tunability and compression performance were verified, and LFM signals with time bandwidth products of 480, 640, and 3200 were generated. At the receiving end, echo signals with delays of 1.0 μs and 0.9 μs were dechirped at the receiver, corresponding to detection distances of 150 m and 135 m, respectively. The scheme is compact and has good reconfigurability.

李昊, 魏永峰, 季玉双, 李想. 雷达线性调频信号产生与去啁啾方法研究[J]. 激光与光电子学进展, 2021, 58(3): 0306003. Li Hao, Wei Yongfeng, Ji Yushuang, Li Xiang. Generation and Dechirping of Linear Frequency Modulation Signals[J]. Laser & Optoelectronics Progress, 2021, 58(3): 0306003.

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