Comparison of digital beamforming algorithms for 3-D terahertz imaging with sparse multistatic line arrays
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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Copernicus Publications
2017-12-01
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| Series: | Advances in Radio Science |
| Online Access: | https://www.adv-radio-sci.net/15/283/2017/ars-15-283-2017.pdf |
| Summary: | 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. |
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| ISSN: | 1684-9965 1684-9973 |