Effect analysis of antenna translation vibration on GEO SARimage
| Autor: | Gen Li, Zheng Lv, Wei Yin, Tianyi Zhang, Meng Ke, Zegang Ding |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Synthetic aperture radar
Point spread function geosynchronous synthetic aperture radar Image quality Computer science optical transfer function doppler radar Doppler radar 0211 other engineering and technologies Energy Engineering and Power Technology leo sar 02 engineering and technology radar antennas antenna translation vibration law.invention symbols.namesake extremely long synthetic aperture time law Optical transfer function Radar imaging second-order doppler spectrum 0202 electrical engineering electronic engineering information engineering sat 021101 geological & geomatics engineering Remote sensing atv General Engineering Astrophysics::Instrumentation and Methods for Astrophysics 020207 software engineering point spread function radar imaging Computer Science::Graphics geo sar image quality antenna arrays lcsh:TA1-2040 high-order doppler spectrum Physics::Space Physics symbols solar array echo signal model Antenna (radio) lcsh:Engineering (General). Civil engineering (General) Doppler effect low-earth-orbit sar Software synthetic aperture radar psf |
| Zdroj: | The Journal of Engineering (2019) |
| DOI: | 10.1049/joe.2019.0449 |
| Popis: | Due to the high orbital altitude, the large-area antenna and solar array will be utilised in geosynchronous synthetic aperture radar (GEO SAR) to meet the requirement of high transmitting power. However, the large-area antenna and solar array can easily cause antenna translation vibration (ATV) and further result in paired echo, which will seriously affect the GEO SAR image quality. Existing effect analyses of antenna vibration for low-earth-orbit SAR (LEO SAR) based on the linear trajectory and the corresponding second-order Doppler spectrum cannot be applied in GEO SAR because of its extremely long synthetic aperture time (SAT), curved trajectory, and corresponding high-order Doppler spectrum. To analyse the effects of ATV on GEO SAR image, the ideal echo signal model and the corresponding point spread function (PSF) of GEO SAR are first established and deducted, respectively. Then, the echo signal model and PSF affected by ATV are obtained. Based on the affected PSF, the effects of the ATV on GEO SAR image are analysed in detail, and the basis for subsequent ATV suppression is also obtained. Computer simulations validate the correctness of the analyses shown here. |
| Databáze: | OpenAIRE |
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