基于直接数字波形合成技术的主动式太赫兹安检仪基带信号源设计  

Design of the broadband signal generator of active THz security detector based on DDWS technology

作　　者：何君 屈俭 宁绍 李世超 HE Jun;QU Jian;NING Shao;LI Shichao(Rainbow UAV Technology Co.,Ltd.,China Academy of Aerospace Aerodynamics,Beijing 100074,China;Beijing Aerospace Yilian Science&Technology Development Co.,Ltd.,Beijing 100176,China)

机构地区：[1]中国航天空气动力技术研究院彩虹无人机科技有限公司,北京100074 [2]北京航天易联科技发展有限公司,北京100176

出　　处：《电子设计工程》2021年第21期127-131,136,共6页Electronic Design Engineering

摘　　要：由于主动式太赫兹安检仪中信号源的波形质量会直接影响成像质量,文中采用直接数字波形合成(Direct Digital Waveform Synthesis,DDWS)技术,实现了主动式太赫兹人体安检仪雷达发射机基带宽频信号源的设计与研制。阐述了DDWS技术的原理,确定了DDWS作为该信号源的技术基础;根据理论,利用Matlab进行线性调频信号(LFM)的仿真,并产生所需线性调频信号;论述了基于FPGA的高速数据传输设计、系统时钟设计、高速DAC设计。通过对输出信号频谱的测试,可以得出该系统带宽为210~330 MHz、脉宽为120μs、相位噪声小于-142 dBc/Hz@1 MHz。The waveform quality of signal source will directly affect the imaging quality,DDWS technology is used to realize the design of broadband signal source of radar transmitter in active THz human body security detector.The principle of DDWS technology is designed.According to the theory,the LFM signal and generate data of the required LFM signal in Matlab are simulated.The design of high⁃speed data transmission in FPGA,system clock and high⁃speed DAC are discussed.By testing the spectrum of the output signal,the system has a bandwidth of 210~330 MHz,a pulse width of 120μs and a phase noise is less than-142 dBc/Hz@1 MHz.

关 键 词：信号源 雷达发射机 FPGA DDWS 太赫兹 

分 类 号：TN710[电子电信—电路与系统]