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High frequency vibration of the platform or the targets is an inevitable problem in the field of radar imaging, and it has significant effects on the image quality, especially in the terahertz band. In this paper, a compensation method for high frequency vibration based on dominant scatterers is proposed. The essence of this method is estimation and compensation of the high frequency vibration by...
In this paper, a 0.32 THz imaging radar system was built and experiment on a precession warhead model is presented. The imaging algorithm based on range-instantaneous Doppler algorithm is adopted and high resolution ISAR imaging results are obtained. From these imaging results, we can easily recognize structures and even the subtle structures of the precession target, which verify the advantages of...
Terahertz imaging has been shown to have the potential to detect objects hidden under common coverings. In this paper, a 360° fast rotating imaging scheme for the detection of concealed objects using terahertz radar is proposed and validated by proof-of-concept experiments. The imaging results of three dangerous objects, i.e. hammer, scissor and metal handgun model, covered with fabric and cardboard...
The high resolution radar imaging has important applications in battlefield reconnaissance target detection and recognition et al.. Compared to microwave used in the conventional radar imaging, the terahertz wave has higher frequency and shorter wavelength and thus can provide larger absolute bandwidth. And the coded-aperture imaging is an expansion of the classic pinhole imaging, which has great...
The compressive sensing (CS) has been successfully used in inverse synthetic aperture radar (ISAR) imaging. Since the sparse reconstruction based on l1 norm is sensitive to the regularized factor and makes it inconvenient to be used in practice, the sparse Bayesian learning (SBL) is considered in this situation, which retains a preferable property of the l0 norm and has no user parameter. In this...
In this work a multiple-views real array imaging method for terahertz radar is demonstrated and theoretically explained based on synthetic aperture technique. Taking full advantage of short wavelength of terahertz wave, the real transreceiver array can provide high-resolution in transverse dimensions, while a wideband signal provides the resolution in the range dimension. Based on the inverse synthetic...
A space-time joint estimated algorithm, SAFE algorithm, is developed to estimate azimuth angle and Doppler frequency of targets within one beam width in this paper. The algorithm applies the multi-channel super-resolution technique to the single-channel scanning system radar in order to improve the estimated precision of azimuth angle. Theory and simulation analysis verifies the validity of the algorithm...
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