A Hardware Amplitude and Phase Distortion Compensation Method for THz FOD System
Terahertz(THz)imaging technology is a newly developed high frequency band imaging technology,which has important application value in military and security fields.When the real wave velocity THz foreign object detection(FOD)system in this paper is not compensated for wideband amplitude and phase distortion,the ratio of sidelobe to mainlobe of one-dimensional image is bad,and the two-dimensional image of tiny target can't be obtained.Considering that the imaging system adopts the self-mixing dechirp method of frequency modulation continuous wave which is easy to realize in high band,the amplitude and phase predistor-tion compensation method of the traditional wideband imaging system in signal generation cannot take effect,therefore a hardware amplitude and phase distortion compensation method for the real wave velocity THz FOD system is proposed in this paper.In this method,the amplitude and phase distortion is compensated by implementing the first phase and then amplitude passband distortion compensation to quadrature data of receiver's digital down conversion in the THz FOD system.After using this method,the ratio of sidelobe to mainlobe with Hamming window of one-dimensional image is more than 40 dB,and two-dimensional image of tiny target can be obtained in the THz FOD System.
terahertz(THz)distortionphase compensationamplitude compensationratio of sidelobe to mainlobe
万方数据
维普
