Abstract
In this paper, a security screening imaging method for walking human with single channel synthetic aperture radar (SAR) technology is proposed. According to the theory of SAR imaging, the imaging response for each single echo of the three dimensional (3D) moving target is analyzed. Then, the relationships between the accurate degree of imaging result and radar system parameters are presented with the global human walking model, which can be summarized as: positive correlations with radar angular velocity and rotation radius, negative correlations with aperture time and motion velocity, and uncertainty with radar initial angle. Hence, the short synthetic aperture time and high-resolution of terahertz (THz) radar makes it particularly suitable for walking human security imaging. Meanwhile, the main Doppler frequency shift of walking human imaging is corrected by the back-projection (BP) algorithm modified with the estimated velocity detected by the range profile. Besides, the numerical simulation experiments of point targets are provided to verify the conclusion of moving target imaging response. Furthermore, the experiments of walking human are processed with different radar system parameters to demonstrate the performance and effectiveness of our method.
Highlights
Nowdays, with the increase of terrorist attacks, security screening technology gains great attention
Pacific Northwest National Laboratory (PNNL) designed an MMW security screening system named SafeView (L-3), which has been widely applied in airports for concealed weapon detection of static stand human body [3], [4]
We proposed a security imaging method for multiple human targets screening with adaptively scene segmentation [11]
Summary
With the increase of terrorist attacks, security screening technology gains great attention. Remote Sensing Laboratory of Bauman Moscow State Technical University designed a security imaging system, which has two linear antenna arrays and two time-of-flight cameras (TOF-camera), for walking human screening with inverse synthetic aperture radar (ISAR) technology [14], [15]. According to the SAR imaging theory of moving target [24], [25], the shift caused by Doppler frequency and blur caused by the motion trail over synthetic aperture time will occur in the imaging result. A single channel synthetic aperture radar (SAR) imaging method for walking human security screening is proposed. THz radar only needs a very short aperture radar time to obtain a high-resolution image thanks to its wide bandwidth, FIGURE 1.
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