Research Institute of Basic Sciences, Seoul National University, Seoul 88026, Korea.
School of Earth and Environmental Science, Seoul National University, Seoul 88026, Korea.
Sensors (Basel). 2020 Dec 19;20(24):7310. doi: 10.3390/s20247310.
A sea surface imaging technique for an emergency response using a ready-made frequency modulated continuous wave-synthetic aperture radar (FMCW SAR) system and its experimental results are described in this paper. The optimal range of radiowave incidence angle for sea surface imaging was analyzed by a theoretical scattering model and measurement data, and it was properly applied to the FMCW SAR system by readjusting the delayed-dechirp process. Raw data acquired through flight experiments were reconstructed to SAR image by the range-doppler algorithm. To verify the performance of the reconstructed sea surface image, dual-channel images collected by the configuration of the along-track interferometry were used, and then performance indicators such as signal attenuation, coherence, and phase difference were analyzed. Through this experimental study, it was confirmed that the ready-made FMCW SAR system without a function of the incident angle control can also conduct limited missions for maritime observation. It is possible to be an alternative resource for emergency response, in which the cases are requiring urgent maritime disaster detection and analysis.
本文介绍了一种利用现成调频连续波合成孔径雷达（FMCW SAR）系统进行应急响应的海面成像技术及其实验结果。通过理论散射模型和测量数据分析了最佳的海面成像雷达波入射角范围，并通过重新调整延迟去斜率过程将其适当地应用于 FMCW SAR 系统。通过距离多普勒算法，对飞行实验获得的原始数据进行重建以得到 SAR 图像。为了验证重建海面图像的性能，使用沿迹干涉测量配置采集双通道图像，然后分析信号衰减、相干性和相位差等性能指标。通过这项实验研究，证实了没有入射角控制功能的现成 FMCW SAR 系统也可以执行有限的海上观测任务。它可以成为应急响应的替代资源，在这种情况下，需要紧急进行海上灾害检测和分析。
