A Study on Terahertz Imaging Radar with Double Receiving Channels

This paper introduces one terahertz imaging radar with double receiving channels. The working frequency of the radar is 216 GHz. In the system design, a Ku-band chirp signal with 800 MHz bandwidth is generated by using Direct Digital Synthesizer (DDS) and frequency synthesizer. Then the Ku-band signal is divided into two signals, which are mixed with two point frequency to produce a 36 GHz 400 MHz RF signal and a 35. 95 GHz 依400 MHz LO signal, respectively, driving the THz transmitter and receiver. The LO signal is divided into two signals and sent to two receivers. The receiver uses dechirp method to reduce the data rate. The radar uses a terahertz transmission module with 6 frequency multiplier, resulting in a system bandwidth of 4. 8 GHz, so the distance resolution of this radar is 3 cm. This paper also focuses on the calibration of broadband systems, and carries out high resolution inverse synthetic aperture imaging experiments, which lays the foundation for the research of terahertz interferometric synthetic aperture radar.