| 研究実績の概要 |
In FY2016, the GB-SAR system developed in the FY2015 was used for experiments with buried subsurface corner reflectors in the field. Additional small corner reflectors were build and installed at the intensive test site. GB-SAR images were acquired with different system parameter settings. The soil permittivity was modified by wetting the soil. Bistatic groundborne/airborne SAR experiments and bistatic groundborne/spaceborne experiments were carried out in which the GB-SAR system acted as receiving polarimetric antennas only while the incoming polarimetric signals were transmitted by the airplane and satellite based antennas, respectively. The data was used to investigate the potential to detect subsurface objects from bistatic SAR configurations. Based on electromagnetic reflection and transmission theory combined with the large data base of experimental data and state-of-the-art polarimetric SAR images, semi-empirical algorithms to detect and localize persons and objects buried below ground were developed and tested. For the signal processing a focus was on the improvement of clutter reduction in the GB-SAR images. More than 40 subsurface objects were successfully detected from the experiment data taken in different locations. The results demonstrate the suitability of the proposed approach for improved disaster response. One research article discussing the research results has been submitted to a journal and is currently under review. A second publication is being prepared.
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