High-resolution SAR altimeter with wide-angle echoes coherent accumulation
| Autor: | Tang Weijie, Wenxian Yu, Zenghui Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
radar cross-sections
high-resolution sar altimeter wide-angle sar altimeters wide-angle synthetic aperture radar altimeters radar resolution General Engineering Energy Engineering and Power Technology High resolution radar altimetry scattering echo characteristics height measurement lcsh:TA1-2040 estimation theory Altimeter parameter estimation lcsh:Engineering (General). Civil engineering (General) Software Geology Physics::Atmospheric and Oceanic Physics wide-angle echo coherent accumulation Remote sensing synthetic aperture radar |
| Zdroj: | The Journal of Engineering (2019) |
| DOI: | 10.1049/joe.2019.0792 |
| Popis: | Wide-angle synthetic aperture radar (SAR) altimeters, which are able to obtain higher azimuth resolution and better height measurement result, demonstrate a promising prospect of application. Accumulating scattering echoes received from different angles can greatly suppress noise and promote estimation accuracy. However, traditional methods of accumulation cannot work well in wide-angle SAR altimeters due to variety of scattering characteristics. To address this problem, this study first researches on basic principles, scattering function and signal models of wide-angle SAR altimeters. Based on these models, echoes of various angles are coherent accumulated to estimate the parameters. A cylindrical target on the sea surface is used as an example in the simulation. The results indicate that the precision of parameter estimation is improved by two to four orders of magnitude if the scattering characteristics varying with azimuth angles are taken into account in the step of echoes accumulation. |
| Databáze: | OpenAIRE |
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