# Adaptive 3D Imaging for Moving Targets Based on a SIMO InISAR Imaging System in 0.2 THz Band
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[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.Z. );  
[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.Z. );  
[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.Z. );  
[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.Z. );  
[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.Z. );  
[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.Z. );  
[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.Z. );  
[PERSON]DRESS] (S.Z. );  
[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (H.L. ); [EMAIL_ADDRESS] (S.W. ); [EMAIL_ADDRESS] (S.Z. );  
[PERSON]  
1 Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;  
1 [EMAIL_ADDRESS] (H.  
With the remarkable progress of THz devices in the past decades, a series of THz imaging systems have been developed for different applications. Depending on the working scenario, the current THz imaging systems can be classified into two types, one is the stationary scenario and the other is the cooperative moving scenario. In the stationary imaging scenario, the targets are required to keep static during imaging. A typical imaging scheme designed for this scenario is the beam-scanning system, where the beam is focused on a small spot and scanned over the imaging area by mechanical or optic-mechanical configuration. The image is obtained by processing the recorded echoes at each scanning grid [3; 4; 5; 6; 7]. The typical applications based on the beam-scanning scheme include the 0.35 THz standoff personnel screening system developed by the Pacific Northwest National Laboratory (PNNL) [3; 4; 5] and the 0.67 THz imaging system developed by the jet propulsion laboratory (JPL) for the similar purpose [6; 7]. Although a high resolution can be achieved, the scanning scheme increases the imaging time consumption and system complexity. What's worse, the imaging field of view (FOV) is limited. Another THz imaging scheme for the stationary scenario is the synthetic aperture radar (SAR) imaging [17; 18; 19; 20; 21], which realizes cross-range resolution by the movement of the radar system. Since the range resolution depends on the signal bandwidth, focused images can be obtained at any distance. With a combination of synthetic-aperture concept and quasi-optical scanning, a fan-beam imaging system in 0.2 THz band was also proposed [8]. However, in the SAR imaging scenario, the targets can only be observed within a limited window when the radar beam scans over the target area; thus the FOV is still limited. As for the THz imaging system for cooperative moving scenario, mainly two schemes are investigated in the current research. The first is to promote the imaging frame rate, by integrating the multi-input and multi-output (MIMO) array to the beam-scanning system to simplify the scanning operation, which largely promotes the imaging efficiency [9; 10; 11; 12; 13; 14; 15; 16].