基于高速数字相关器的太赫兹干涉仪系统研究

发布时间：2018-03-26 21:39

  本文选题：太赫兹　切入点：干涉成像　出处：《电子与信息学报》2016年04期

【摘要】：干涉仪利用通道间的相关运算进行测量,是干涉式成像的基本单元。太赫兹成像在安全检查、军事侦查等方面有着广泛的应用前景。将干涉成像测量引入太赫兹领域后,为解决相关运算中高速信号的相位同步问题,该文提出基于低速FPGA控制的交叉同步方案,用低硬件代价解决高速采样信号的相位同步问题,并完成了一套多通道高速数字相关系统。系统的最高采样速率为5 GHz,ADC有效位数大于等于6位,相关器积分时间可调。最后,利用该数字相关器和相应的太赫兹微波元器件搭建了中心频率为0.44 THz的干涉仪,并得到了清晰的干涉条纹,其线性相位误差小于2?。该研究为今后设计太赫兹干涉成像仪提供了基本单元。
[Abstract]:Interferometer is the basic unit of interferometric imaging. Terahertz imaging has a wide application prospect in security inspection, military reconnaissance and so on. After the interferometer is introduced into the field of terahertz, the interferometer is a basic unit of interferometric imaging. In order to solve the phase synchronization problem of high speed signal in correlation operation, this paper proposes a cross synchronization scheme based on low speed FPGA control, which solves the phase synchronization problem of high speed sampling signal with low hardware cost. A multichannel high speed digital correlation system is developed. The maximum sampling rate of the system is more than or equal to 6 bits in 5 GHz ADC, and the integral time of the correlator can be adjusted. Finally, Using the digital correlator and the corresponding terahertz microwave components, an interferometer with a center frequency of 0.44 THz has been constructed, and a clear interference fringe has been obtained. The linear phase error is less than 2? This study provides a basic unit for the future design of terahertz interferometer.
【作者单位】： 中国科学院国家空间科学中心微波遥感重点实验室;中国科学院大学;北京理工大学;
【分类号】：TH744.3
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本文编号：1669741