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利用地球同步轨道InSAR每日生成DEM的质量分析
Zefa Yang, Qingjun Zhang, Xiaoli Ding, Wu Chen
工程（英文） ›› 2020, Vol. 6 ›› Issue (8) : 913-918.
PDF(2384 KB)
PDF(2384 KB)
利用地球同步轨道InSAR每日生成DEM的质量分析
Analysis of the Quality of Daily DEM Generation with Geosynchronous InSAR
最新的数字高程模型（DEM）产品在灾害防治、城市管理等诸多领域中扮演着重要角色。利用机载或低地球轨道（LEO）的星载干涉合成孔径雷达（InSAR）生成DEM已被证明是可行且极具价值的方法。然而，受成本和卫星重返周期的限制，该技术难以频繁（如每天）生成或更新大区域范围（如大陆尺度或更大范围）的DEM。由于对地同步合成孔径雷达（GEOSAR）卫星运行于地球静止轨道，因此它们能以相当短的重返时间（每天或更短）观测同一地面区域，这为实现生成每日DEM这一理想但目前难以实现的目标提供了潜在可能。为此，本文系统地分析了利用GEOSAR卫星生成的每日DEM产品质量。结果表明：GEOSAR卫星生成的每日DEM产品精度通常远低于利用传统低轨星载合成孔径雷达（SAR）获得的DEM产品。因此，研究GEOSAR DEM生成过程中的误差削弱方法显得至关重要。
Up-to-date digital elevation model (DEM) products are essential in many fields such as hazards mitigation and urban management. Airborne and low-earth-orbit (LEO) space-borne interferometric synthetic aperture radar (InSAR) has been proven to be a valuable tool for DEM generation. However, given the limitations of cost and satellite repeat cycles, it is difficult to generate or update DEMs very frequently (e.g., on a daily basis) for a very large area (e.g., continental scale or greater). Geosynchronous synthetic aperture radar (GEOSAR) satellites fly in geostationary earth orbits, allowing them to observe the same ground area with a very short revisit time (daily or shorter). This offers great potential for the daily DEM generation that is desirable yet thus far impossible with space-borne sensors. In this work, we systematically analyze the quality of daily GEOSAR DEM. The results indicate that the accuracy of a daily GEOSAR DEM is generally much lower than what can be achieved with typical LEO synthetic aperture radar (SAR) sensors; therefore, it is important to develop techniques to mitigate the effects of errors in GEOSAR DEM generation.
每日DEM生成 / InSAR / 地球同步SAR / 精度分析
Daily digital elevation model / Interferometric synthetic aperture radar / Geosynchronous synthetic aperture radar / Accuracy analysis
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