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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~0.688 8 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。
In order to achieve the imaging resolution of cm or even sub-centimeter, a 0.67 THz linear frequency modulated continuous wave (FMCW) imaging experiment platform was designed and constructed from the perspective of electronics. The platform obtains the transmit signal of 0.66 THz ~ 0.688 8 THz by multiplying the chirp band of 1.2 GHz and the linear frequency modulated signal of 2 W with a power of about 1.2 mW. The echo of the receiving end is subjected to harmonic mixing to complete the ramp Dechirp) form 2.4 GHz IF signal, the second frequency after high-speed sampling into the signal processing chassis to complete the imaging. Radar signal transmission bandwidth of 28.8 GHz, the system non-linear correction processing, the imaging resolution of 1.3 cm, validated the high-resolution imaging capabilities of terahertz radar.