| dc.description.abstract | Synthetic Aperture Radar (SAR) is a technology that utilizes radar principles for image formation. It provides information on surface reflectivity, elevation, vegetation coverage, and ocean wave velocity characteristics. SAR finds extensive applications in various fields such as military, meteorology, oceanography, geology, and urban planning. To facilitate the research, development, and to execute related projects by the Council of Agriculture, National Central University has previously established the TaiSAR airborne SAR system. Designed by Mitsubishi Corporation, the system had initially undergone preliminary functional verification, successfully conducting aerial surveys and obtaining images. However, due to contract acceptance issues, and the original aircraft platform was damaged during landing. As a result, the system remained unused for several years, leading to equipment scatter and damages to both software and hardware components. Additionally, rapid advancements in information and electronic technology resulted in material and accessory shortages and discontinued production, further increasing the difficulty of repair.
This study is dedicated to the restoration of the TaiSAR system. During the initial experiments, scattered equipment was gradually retrieved and assembled. For discontinued and missing equipment, alternative components were sourced, and equipment replacements were carried out. Furthermore, software was upgraded, and reprogrammed to finally restore the system′s functionality and normal operation. The process and methods employed in the system repair and difficulties overcome can provide valuable references for radar system research, remote sensing instrument maintenance, and assembly for various industries.
Moreover, to validate the performance and functionality restoration of the TaiSAR system, and to improve traditional satellite and airborne SAR systems′ related limiting factors, the experiment designed the installation of the TaiSAR system within a vehicle compartment to execute missions. During the experiments, SAR radiometric experiments were conducted over the Xionglin river valley in Hsinchu County and the Guishan island in Yilan County. In the Xionglin river valley experiment, although signals were received, discerning the target object proved challenging. In contrast, the Guishan island experiment successfully acquired SAR images after adjusting parameters such as the visible distance. The obtained images were then compared with the island′s characteristics through antenna angle adjustments, confirming the match between the images and the island′s wider bottom and narrower top features. The experimental results not only demonstrated the successful restoration of the TaiSAR system but also provided a new, highly mobile, time-saving, cost-efficient ground verification method. This research is believed to be suitable as a pre-launch testing procedure for airborne and satellite SAR equipment and can serve as a technical reference for conducting SAR ground tests. | en_US |