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 W frequency band to verify the theoretical results.
Baccouche, B., Agostini, P., Schneider, F., Sauer-Greff, W., Urbansky, R., & Friederich, F. (2017). Comparison of digital beamforming algorithms for 3-D terahertz imaging with sparse multistatic line arrays. Advances in Radio Science, 15, 283–292. https://doi.org/10.5194/ars-15-283-2017