CAJ | 학술논문

为达到厘米甚至亚厘米级的成像分辨力,从电子学角度出发,设计并构建了0.67 THz线性调频连续波(FMCW)成像实验平台.平台通过将 Ka波段带宽1.2 GHz、功率2 W的线性调频信号24倍频,获得0.66 THz~0.6888 THz的发射信号,功率约为1.2 mW,接收端的回波经过谐波混频完成去斜(Dechirp)形成2.4 GHz中频信号,二次变频后经高速采样送入信号处理机箱完成成像.雷达发射信号带宽为28.8 GHz,经系统非线性校正处理后,成像分辨力达到1.3 cm,验证了太赫兹雷达的高分辨成像能力.
위체도전미심지아전미급적성상분변력,종전자학각도출발,설계병구건료0.67 THz선성조빈련속파(FMCW)성상실험평태.평태통과장 Ka파단대관1.2 GHz、공솔2 W적선성조빈신호24배빈,획득0.66 THz~0.6888 THz적발사신호,공솔약위1.2 mW,접수단적회파경과해파혼빈완성거사(Dechirp)형성2.4 GHz중빈신호,이차변빈후경고속채양송입신호처리궤상완성성상.뢰체발사신호대관위28.8 GHz,경계통비선성교정처리후,성상분변력체도1.3 cm,험증료태혁자뢰체적고분변성상능력.
A 0.67 THz imaging radar is designed and constructed by using Frequency Modulated Continuous Wave(FMCW) technique. The peak output power of the transmitting signal is about 1.2 mW with a bandwidth of 0.66 THz-0.688 8 THz, which is attained by using a×24 frequency multiplication chain fed by a Ka-band 27.5 GHz-28.7 GHz linear frequency-modulated input source with 2 W driving power. After reflecting, the received signal is de-chirped by a×12 multiplier chain pumping Subharmonic Receiver Mixer(SHM) to get a 2.4 GHz IF signal. With an operating bandwidth of 28.8 GHz, the range resolution of terahertz radar is about 1.3 cm after calibration procedure compensating for signal distortion from radar waveform nonlinearities. Experiment results demonstrate the high resolution imaging ability of terahertz radar.