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 
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Generation and Dechirping of Linear Frequency Modulation Signals
图 & 表
图 1. 线性调频信号生成与去啁啾系统原理框图
Fig. 1. Schematic of proposed LFM signals and de-chirp generation scheme
图 3. 发射信号与接收信号的时频特点
Fig. 3. Time-frequency characteristics of transmitting and receiving waves
图 7. 经20次循环后PD输出的线性调频信号时域图
Fig. 7. Time domain diagram of LFM signal output by PD after 20 cycles
图 8. 20次循环后线性调频信号。（a）频谱图；(b)时频图
Fig. 8. LFM signal after 20 cycles. (a) Spectrum; (b) time-frequency diagram
图 9. 不同中心频率的线性调频信号。(a) 频谱图；(b) 时频图
Fig. 9. LFM signals with different center frequencies. (a) Spectrum; (b) time-frequency diagram
图 10. 30次循环后的信号频谱图和时频图。（a） 频域图；(b) 时频图
Fig. 10. Spectrum and time-frequency diagram of LFM signal after 30 cycles. (a) Spectrum; (b) time-frequency diagram
图 11. 时宽为20 ns信号。(a) 抛物线信号；(b) 频谱图；(c) 时频图
Fig. 11. Signal with time width of 20 ns. (a) Parabolic signal; (b) spectrum; (c) time-frequency diagram
图 12. 信号幅度增大一倍的信号。(a) 抛物线信号；(b) 频谱图；(c) 时频图
Fig. 12. Signal with larger amplitude. (a) Parabolic signal; (b) spectrum; (c) time-frequency diagram
图 13. 相位编码信号。(a) 抛物线信号；(b) 频谱图；(c) 时频图
Fig. 13. Phase coded signal. (a) Parabolic signal; (b) spectrum; (c) time-frequency diagram
图 14. 线性调频信号自相关结果。(a) 经20次循环；(b) 经30次循环
Fig. 14. Autocorrelation results of LFM. (a) After 20 cycles; (b) after 30 cycles
图 17. 不同时延的回波信号去啁啾所得单频信号
Fig. 17. Single frequency signal obtained by de-chirping echo signal with different time delay
表 1不同抛物线信号对带宽、时间带宽积、啁啾率的影响
Table1. Effect of different parabolic signals on bandwidth, time-bandwidth product and chirp rate
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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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