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首页> 外文期刊>Advances in space research >Evaluation of the precision of different Delay-Doppler Processor (DDP) algorithms using CryoSat-2 data over open ocean
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Evaluation of the precision of different Delay-Doppler Processor (DDP) algorithms using CryoSat-2 data over open ocean

机译：使用CryoSat-2数据评估海洋上不同的延迟多普勒处理器（DDP）算法的精度

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This article explores the modification and inclusion of different algorithms within an in-house Delay-Doppler Processor (DDP) chain in order to understand their potentiality and the related impact in terms of geophysical retrievals' precision, when operating the synthetic aperture radar (SAR) mode of CryoSat-2 mission over open ocean. To do so, a flexible and tunable processing chain has been developed by isardSAT, being able to accommodate the different algorithms/options. Two different levels of analysis have been carried out. On one hand, the CryoSat-2 nominal SAR processing baseline is compared against the one considered in the state of the art Sentinel-3 ocean topographic mission, and then, against a modified version of CS-2, where the samples set to zero by the processor on the stack are not included in the incoherent averaging. On the other, the integration of an advanced processing at stack level and based on the amplitude compensation and dilation compensation (ACDC) is evaluated within the CryoSat-2 DDP. A comparative study of the different DDP configurations is presented exploiting SAR full bit rate (FBR) data from CryoSat-2 over two regions in the central Pacific Ocean and the Agulhas box. Ad-hoc SAR ocean retrackers are exploited to derive the geophysical parameters (sea surface height-SSH and significant wave height-SWH), such that the performance of the different baselines can be quantified in terms of precision, i.e., estimation noise. (C) 2018 COSPAR. Published by Elsevier Ltd. All rights reserved.
机译：本文探讨了内部延迟多普勒处理器（DDP）链中不同算法的修改和纳入，以便在操作合成孔径雷达（SAR）时了解其潜力以及对地球物理检索精度的相关影响。在远洋上的CryoSat-2任务模式。为此，isardSAT已开发了一种灵活且可调的处理链，能够适应不同的算法/选项。进行了两种不同级别的分析。一方面，将CryoSat-2标称SAR处理基线与最先进的Sentinel-3海洋地形任务中考虑的基线进行比较，然后与CS-2的修改版本进行比较，在CS-2的修改版本中，样本设置为零。非相干平均中不包括堆栈上的处理器。另一方面，在CryoSat-2 DDP中评估了基于堆栈的高级处理的集成，并基于幅度补偿和膨胀补偿（ACDC）。利用来自CryoSat-2的SAR全比特率（FBR）数据，对太平洋中部和Agulhas盒两个区域的数据进行了比较研究。利用特设的SAR海洋追踪器来推导出地球物理参数（海面高度SSH和有效波高SWH），以便可以根据精度（即估计噪声）来量化不同基准的性能。 （C）2018年COSPAR。由Elsevier Ltd.出版。保留所有权利。

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