2020 Volume 9 Issue 6 Pages 176-181
Achieving high-precision and high-resolution imaging with millimeter-wave radar requires a large number of antennas and data volumes. In this study, we applied the Khatri-Rao (KR) product extended array processing to synthetic aperture radar (SAR) data to increase the number of antenna elements substantially and extend the synthetic aperture length. The target of interest in this study is relative short range target, which is several meters away from the radar, such as indoor human with a small object on his/her body. When the target is close to the radar, target imaging by SAR using the far-field approximation will often increase the error. In this case target-imaging by using range-migration is required. However, this processing often computationally inefficient. In this study, we evaluate image-quality of short-range 2-dimensional imaging with far-field and near-field mode vector with/without range migration. The image-quality is examined by peak power gain. Numerical results show that the near-filed mode vector works properly for out study without range migration. In addition, SAR imaging using KR product extended arrays shows that image quality can be improved compared to conventional uniform SAR.
