Comparison of digital beamforming algorithms for 3-D terahertz imaging with sparse multistatic line arrays

• Main Authors: B. Baccouche, P. Agostini, F. Schneider, W. Sauer-Greff, R. Urbansky, F. Friederich
• Format: Article
• Language: deu
• Published: Copernicus Publications 2017-12-01
• Series: Advances in Radio Science
• Online Access: https://www.adv-radio-sci.net/15/283/2017/ars-15-283-2017.pdf

In this contribution we compare the back-projection algorithm with our recently developed modified range migration algorithm for 3-D terahertz imaging using sparse multistatic line arrays. A 2-D planar sampling scheme is generated using the array's aperture in combination with an orthogonal synthetic aperture obtained through linear movement of the object under test. A stepped frequency continuous wave signal modulation is used for range focusing. Comparisons of the focusing quality show that results using the modified range migration algorithm reflect these of the back-projection algorithm except for some degradation along the array's axis due to the operation in the array's near-field. Nevertheless the highest computational efficiency is obtained from the modified range migration algorithm, which is better than the numerically optimized version of the back-projection algorithm. Measurements have been performed by using an imaging system operating in the <i>W</i> frequency band to verify the theoretical results.