一種俯沖段子孔徑SAR大斜視成像及幾何校正方法

李震宇; 梁毅; 邢孟道; 保錚

doi:10.11999/JEIT141516

一種俯沖段子孔徑SAR大斜視成像及幾何校正方法

doi: 10.11999/JEIT141516

基金項(xiàng)目:

國家自然科學(xué)青年基金(61101245)和中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金(K5051302046)

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- 文章訪問數(shù): 1115
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2014-11-27
- 修回日期: 2015-03-27
- 刊出日期: 2015-08-19

New Subaperture Imaging Algorithm and Geometric Correction Method for High Squint Diving SAR Based on Equivalent Squint Model

摘要

摘要: 俯沖合成孔徑雷達(dá)(SAR)成像由于垂直向下速度的存在，使得沿水平飛行方向不再滿足平移不變性，導(dǎo)致常規(guī)全孔徑成像算法無法直接運(yùn)用于俯沖段的大斜視子孔徑成像。針對這些問題，該文基于俯沖等效平飛模型以及子孔徑成像特性提出一種俯沖段子孔徑SAR大斜視成像算法頻域相位濾波算法(FPFA)。其創(chuàng)新思想是通過方位頻域引入濾波因子校正方位空變。由于俯沖等效平飛模型會造成成像平面的旋轉(zhuǎn)，引起較大的圖像畸變，為了解決該問題，該文進(jìn)一步提出一種基于反向投影的快速幾何校正方法，得到近似無畸變或畸變較小的地距圖像。仿真和實(shí)測數(shù)據(jù)處理驗(yàn)證該文成像方法和幾何校正方法的有效性。
- 俯沖合成孔徑雷達(dá) /
- 子孔徑 /
- 頻域相位濾波算法 /
- 反向投影 /
- 幾何校正
Abstract: The ordinary full-aperture SAR imaging algorithms are inapplicable to focus high squint diving SAR subaperture data due to its property of vertical velocity which brings variance in azimuth. Based on the equivalent squint model and the characteristic of subaperture imaging, this paper explores a Frequency Phase Filtering Algorithm (FPFA) to implement high squint SAR subaperture data focusing. The innovative idea is the introduced filtering phase in the azimuth frequency domain in order to eliminate the azimuth dependence. Finally, the equivalent squint model causes the geometric deformation; due to this issue, a modified inverse-projection method corresponding to FPFA is proposed to get the final image without deformation. The simulation results and raw data processing validate the effectiveness of the proposed method.
- Diving SAR /
- Subaperture /
- Frequency Phase Filtering Algorithm (FPFA) /
- Inverse-projection /
- Geometric correction

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參考文獻(xiàn)(24)

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