Decorrelation effects in bistatic TanDEM-X data
Decorrelation effects in bistatic TanDEM-X data
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DOI：
10.1109/igarss.2012.6352346
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发表时间：
2012-07
期刊：
影响因子：
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通讯作者：
M. Martone;Benjamin Bräutigam;G. Krieger
中科院分区：
文献类型：
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作者：
M. Martone;Benjamin Bräutigam;G. Krieger
Tandem-X任务由两颗几乎相同的卫星组成：TerraSAR-X和Tandem-X。该任务的主要目标是以前所未有的精度生成全球范围内一致的数字高程模型(DEM)。这两颗卫星在接近的轨道上飞行，充当一个大型单程雷达干涉仪，有机会灵活地选择基线，从而能够获得高精度的跨轨和沿轨干涉图[1]。相干γ是评价干涉测量性能的关键参数之一。几个误差源可能会导致相干损失：本文详细研究了有限的信噪比、体积去相关和量化误差对相干损失的影响。此外，还介绍了一种新的方位角切换量化(ASQ)技术，并给出了初步的性能评估。
The TanDEM-X mission comprises two nearly identical satellites: TerraSAR-X and TanDEM-X. The primary objective of the mission is the generation of a worldwide and consistent digital elevation model (DEM) with an unprecedented accuracy. The two satellites fly in a close orbit configuration and act as a large single-pass radar interferometer with the opportunity for flexible baseline selection, allowing the acquisition of highly accurate cross- and along-track interferograms [1]. One of the key parameters in estimating interferometric performance is the coherence γ. Several error sources may contribute to a coherence loss: in this paper, the impact of limited signal-to-noise ratio (SNR), volume decorrelation, and quantization errors are investigated in detail. Furthermore, a novel azimuth-switched quantization (ASQ) technique is introduced and a preliminary performance assessment is presented.