闫浩, 赵国庆, 秦国栋. 基于光采样的瞬时测频技术研究[J]. 电波科学学报, 2014, 29(1): 72-78. doi: 10.13443/j.cjors.2013022701
      引用本文: 闫浩, 赵国庆, 秦国栋. 基于光采样的瞬时测频技术研究[J]. 电波科学学报, 2014, 29(1): 72-78. doi: 10.13443/j.cjors.2013022701
      YAN Hao, ZHAO Guoqing, QIN Guodong. Instantaneous frequency measurement technology based on optical sampling[J]. CHINESE JOURNAL OF RADIO SCIENCE, 2014, 29(1): 72-78. doi: 10.13443/j.cjors.2013022701
      Citation: YAN Hao, ZHAO Guoqing, QIN Guodong. Instantaneous frequency measurement technology based on optical sampling[J]. CHINESE JOURNAL OF RADIO SCIENCE, 2014, 29(1): 72-78. doi: 10.13443/j.cjors.2013022701

      基于光采样的瞬时测频技术研究

      Instantaneous frequency measurement technology based on optical sampling

      • 摘要: 传统高频微波信号瞬时测频(Instantaneous Frequency Measurement,IFM)技术受模拟数字转换器(Analog To Digital Converter,ADC)影响很大.提出了一种新的光采样方法,放弃传统的ADC,利用光强度调制器将高频微波信号调制到低重复频率采样光脉冲上,进而达到光采样的目的.利用快速傅里叶变换(Fast Fourier Transform,FFT)结合线性调频z变换(Chirp-z Transform,CZT)的方法,提高频谱分辨率,对欠采样条件下产生的频率余数进行准确估计,进而通过中国余数定理对信号频率进行重构.实验模拟表明,该方法可以对39 GHz带宽内信号频率进行准确测量.

         

        Abstract: Traditional instantaneous frequency measurement(IFM) technique of high frequency microwave signals is greatly influenced by the analog to digital converter(ADC). A novel method based on optical sampling is proposed. Abandoning the traditional ADC, the high frequency microwave signal is modulated onto the low repetition frequency optical pulse trains using an optical intensity modulator, and thus an optical sampling functionality can be achieved. To improve the frequency resolution of measurement, fast Fourier transform(FFT) and chirp-ztransform(CZT) are used. Then the frequency of the input signal are calculated through the Chinese remainder theorem. Experimental results show that this method can accurately measure the frequency of 39 GHz signal bandwidth.

         

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