Abstract:The terahertz Synthetic Aperture Radar(SAR) can tackle with the problems of the low imaging frame rate and poor ability of detecting slow targets for the traditional airborne SAR. However, compared with the traditional SAR in microwave band, the terahertz SAR is more sensitive to the high frequency vibration error of the platform because of the very short carrier wavelength. Meanwhile, the vibration of helicopter platform which is suitable for the terahertz SAR is more violent than that of the traditional fixed wing aircraft platform. Thus, the phase error caused by the platform vibration has a serious effect on the imaging quality. To eliminate the effects of platform vibration on terahertz SAR, the numerical method is adopted to comprehensively analyze the effects of vibration spectrum width, vibration amplitude and resonance components on the imaging quality of terahertz SAR, combining the vibration characteristics of helicopter platform. The constraint conditions between the vibration parameters of platform and the parameters of imaging system are obtained.