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Due to the atmospheric absorption in W-band, especially the spectrum around 94 GHz has been the frequency of choice for radar applications in reconnaissance and metrology, but more recently also for indoor security applications. However, for indoor security applications the propagation environment and scale of the application is quite different as compared to the long-range military and scientific...
Coherent imaging systems always suffer from speckle phenomenon, which blurs the image, and therefore making the information extraction quite difficult. Hadamard speckle contrast reduction (SCR) is considered to be effective to deal with this problem in optics. In this paper, we explore the working principle and effectiveness of this approach, from mathematical deduction to system simulation, and from...
Coherent imaging always suffers from speckle noise, which makes it challenging to extract useful information from the image. The Hadamard technique, based on statistical optics, is expected to deal with speckle at millimeter wave frequencies. In this paper, we will discuss three possible functions of Hadamard phase pattern from the wave point of view. It will be applied to the practical example of...
This paper presents a simplified 2D calculation method based on Huygens' principle for active millimeter wave imaging systems. Although limited in its ability to accurately treat 3D systems, the method is a powerful tool for first order system optimization. We show in this paper how image aberrations such as speckle and glint can be studied and how image enh ancing techniques can be studied with very...
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