太赫兹极高分辨力雷达成像试验研究

摘要

给出了一种载频0.14 THz、带宽5 GHz的极高分辨力太赫兹雷达成像系统样机.系统采用Ka波段毫米波信号二倍频后作为样机收发链路的谐波混频本振,以线性调频连续波信号作为发射信号,接收时采用去斜接收.利用该太赫兹雷达进行了成像试验并得到了1维距离像与逆合成孔径雷达(ISAR)成像结果.结果表明,THz雷达样机实现了3 cm的高分辨力,其ISAR像清晰,反映了目标的细微特征.%The design and realization of a terahertz(THz) radar system with 0. 14 THz carrier frequency and 5 GHz bandwidth have been presented. The Ka band signal was frequency-doubled to be used as the local oscillator signal for sub-harmonic mixer in the system's transceiver chain. For the transmitted signal was a linearly frequency-modulated continuous-wave (LFM-CW), the dechirp technique was used in the THz radar receiver front end. By using this THz radar system, 3 cm high resolution range profiles were obtained as well as inverse synthetic aperture radar(ISAR) images, which exactly represent the subtle features of targets.