Abstract:

Terahertz synthetic aperture radar (SAR) has large bandwidth and is able to acquire high resolution images of moving targets. However, the target motion leads to the position offset and obscure in imaging. Aiming to different forms of motion, the moving targets imaging method based on the phase compensation and equivalent movement is put forward. Firstly, the influence of different motion parameters on imaging is analyzed. And then the image with focused moving targets and blurred background is obtained by employing the phase compensation and equivalent load machine speed. Secondly, the images of target and background focused respectively are acquired by constant false alarm rate (CFAR) detection and inverse imaging processing. Finally, it realizes the accurate imaging of moving targets in the static background by adding the two aforementioned images together. Electromagnetic calculation data simulation results under different signal-to-noise ratio (SNR) show the effectiveness of the proposed method.