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首页> 外文期刊>IEE proceedings. Radar, sonar and navigation >Improved azimuthal resolution of forward looking SAR by sophisticated antenna illumination function design
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Improved azimuthal resolution of forward looking SAR by sophisticated antenna illumination function design

机译：通过先进的天线照明功能设计提高前视SAR的方位角分辨率

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摘要

In comparison to side looking synthetic aperture radar (SAR), in a forward looking SAR it is much more difficult to achieve high angular resolution. The reason for this resolution problem is that terrain points situated symmetrically about the flight path have the same Doppler history, and the gradient of the Doppler frequency is small in the flight direction. A promising way to improve the resolution consists in using minimum variance unbiased (MVU) estimation in the receiver. Unfortunately, MVU estimation leads to undesirable noise enhancement. It is shown that an appropriate method to determine the achievable angular resolution consists in studying this noise enhancement. To minimise the noise enhancement and thus maximise the angular resolution, the author proposes antennas with specific aperture illumination functions. These illumination functions result in radiation patterns which are spread in the angular domain and are simultaneously fine-structured. Quantitative results concerning the noise enhancement and the angular resolution are presented and discussed.
机译：与侧视合成孔径雷达（SAR）相比，在前视SAR中要实现高角度分辨率要困难得多。该分辨率问题的原因在于，围绕飞行路径对称放置的地形点具有相同的多普勒历史，并且多普勒频率的梯度在飞行方向上较小。改善分辨率的一种有前途的方法包括在接收机中使用最小方差无偏（MVU）估计。不幸的是，MVU估计导致不希望的噪声增强。结果表明，确定可达到的角分辨率的合适方法在于研究这种噪声增强。为了最小化噪声增强，从而最大程度地提高角分辨率，作者提出了具有特定孔径照明功能的天线。这些照明功能导致辐射图散布在角域中，并且同时具有精细的结构。提出并讨论了有关噪声增强和角分辨率的定量结果。

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