Abstract
In multiple-input-multiple-output synthetic aperture radar (MIMO-SAR) systems, sparse arrays are usually applied, resulting in increased sidelobes of the point spread function. In this paper, a phase shift migration (PSM) imaging algorithm based on the explosion reflection model with modified coherent factor was proposed for sidelobe suppression in MIMO-SAR three-dimensional (3D) imaging application. By defining the virtual difference wavenumber, reconstructing the raw echo by data rearrangement in wavenumber domain, the original coherent factor algorithm operating in spatial domain can be achieved by the PSM algorithm frame in the wavenumber domain, which means two orders of magnitude increase in computational efficiency. The correctness of the theory is verified by simulation. Finally, a bistatic prototype imaging system in the 0.3 THz band was designed for the proof-of-principle experiments. The experimental results show that the proposed algorithm has a 0.948 structural similarity value to the original coherent factor back-projection algorithm (CF-BPA) which means comparable image quality with much superior efficiency.
Highlights
Terahertz (THz) wave is generally referred to electromagnetic wave with frequency ranging from 0.1 THz to 10.0 THz, which lies between the microwave band and infrared.THz waves can penetrate clothing; compared to X-rays, the photon energy of THz wave is lower and will not produce harmful photoionization effects on biological tissues; compared to the microwave band, it can achieve higher imaging resolution [1,2]
An efficient phase shift migration (PSM) image reconstruction algorithm with modified coherent factor was proposed for the MIMO-SAR 3-D imaging
The coherence factor algorithm can be implemented in the wavenumber domain with high computational efficiency
Summary
Terahertz (THz) wave is generally referred to electromagnetic wave with frequency ranging from 0.1 THz to 10.0 THz, which lies between the microwave band and infrared.THz waves can penetrate clothing; compared to X-rays, the photon energy of THz wave is lower and will not produce harmful photoionization effects on biological tissues; compared to the microwave band, it can achieve higher imaging resolution [1,2]. As the constant growth of various application requirements, lower system cost and higher data acquisition efficiency becomes more and more necessary, especially for real-time security checking scenario, in order to meet the above requirements, multiple-input-multiple-output (MIMO) linear array combined with synthetic aperture scanning is an effective solution to realize 3D imaging in the THz band [11,12,13,14,15]. It takes full advantage of the good penetration, high resolution, and non-ionization of THz waves, while greatly reducing the system cost
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