一種基于坐標(biāo)軸旋轉(zhuǎn)的俯沖段大斜視SAR波數(shù)域成像算法

董祺; 邢孟道; 李震宇; 孫光才

doi:10.11999/JEIT160784

一種基于坐標(biāo)軸旋轉(zhuǎn)的俯沖段大斜視SAR波數(shù)域成像算法

doi: 10.11999/JEIT160784

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61301292)，空間測(cè)控通信創(chuàng)新探索基金(201509A)

計(jì)量
- 文章訪問(wèn)數(shù): 1403
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2016-07-22
- 修回日期: 2016-11-23
- 刊出日期: 2016-12-19

Wavenumber-domain Imaging Algorithm for High Squint Diving SAR Based on Axes Rotation

Funds:

The National Natural Science Foundation of China (61301292), The AeroSpace T.T. C. Innovation Program (201509A)

摘要

摘要: 由于機(jī)動(dòng)平臺(tái)成像的復(fù)雜性，常規(guī)SAR成像方法無(wú)法直接應(yīng)用于俯沖模式下的大斜視成像處理。針對(duì)此問(wèn)題，該文詳細(xì)分析了俯沖段幾何成像模型以及大斜視成像支撐區(qū)選擇問(wèn)題，提出一種基于坐標(biāo)軸旋轉(zhuǎn)的俯沖段大斜視SAR波數(shù)域成像算法。該算法根據(jù)部分孔徑數(shù)據(jù)提出波數(shù)域聚焦處理，并通過(guò)坐標(biāo)軸旋轉(zhuǎn)實(shí)現(xiàn)頻譜的高利用率，在有效避免了位置域聚焦的大量補(bǔ)零的前提下，保障了成像分辨率，提高了處理效率。仿真和實(shí)測(cè)數(shù)據(jù)處理驗(yàn)證了所提算法的有效性。
- 合成孔徑雷達(dá) /
- 大斜視 /
- 俯沖段 /
- 頻譜旋轉(zhuǎn)
Abstract: Due to the complexity of SAR imaging of maneuvering platform, traditional imaging algorithms are unavailable in the diving stage with high squint angle. To deal with these problems, the geometric model in diving stage of high squint SAR is constructed and discussed in detail. Furthermore, the spectrum support zone is analyzed. Then, a wavenumber-domain imaging algorithm for high squint diving SAR based on axes rotation is proposed. The wave-number domain imaging processing for sub-aperture data obtains high-usage of spectrum by axes rotation to guarantee the resolution. By doing so, zero-pudding operations in imaging domain are decreased effectively, which lead to the promotion of efficiency. Simulation results and real data processing are presented to valid the superiority of the proposed approach.
- SAR /
- Highly squinted /
- Diving stage /
- Spectrum transform

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