Two-dimension Space-variance Correction Approach for Diving Highly Squinted SAR Imaging with Sub-aperture

Yanfeng DANG; Yi LIANG; Bowen BIE; Jinshan DING; Yuhong ZHANG

doi:10.11999/JEIT180021

Volume 40 Issue 11

Oct. 2018

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Article Navigation > Journal of Electronics & Information Technology > 2018 > 40(11): 2621-2629

Yanfeng DANG, Yi LIANG, Bowen BIE, Jinshan DING, Yuhong ZHANG. Two-dimension Space-variance Correction Approach for Diving Highly Squinted SAR Imaging with Sub-aperture[J]. Journal of Electronics & Information Technology, 2018, 40(11): 2621-2629. doi: 10.11999/JEIT180021

Citation:

Yanfeng DANG, Yi LIANG, Bowen BIE, Jinshan DING, Yuhong ZHANG. Two-dimension Space-variance Correction Approach for Diving Highly Squinted SAR Imaging with Sub-aperture[J]. Journal of Electronics & Information Technology, 2018, 40(11): 2621-2629. doi: 10.11999/JEIT180021

Citation:

Yanfeng DANG, Yi LIANG, Bowen BIE, Jinshan DING, Yuhong ZHANG. Two-dimension Space-variance Correction Approach for Diving Highly Squinted SAR Imaging with Sub-aperture[J]. Journal of Electronics & Information Technology, 2018, 40(11): 2621-2629. doi: 10.11999/JEIT180021

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Two-dimension Space-variance Correction Approach for Diving Highly Squinted SAR Imaging with Sub-aperture

doi: 10.11999/JEIT180021

Yanfeng DANG^{1, 2},
Yi LIANG^{1, 2
,
,},
Bowen BIE^{1, 2},
Jinshan DING^{1, 2},
Yuhong ZHANG³

1.
National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China
2.
Collaborative Innovation of Information Sensing and Understanding, Xidian University, Xi’an 710071, China
3.
School of Electronic Engineering, Xidian University, Xi’an 710071, China

Funds: The Public Science and Technology Research Funds Projects of Ocean (201405001)

Received Date: 2018-01-05
Rev Recd Date: 2018-06-13

Available Online: 2018-07-20

Publish Date: 2018-11-01

Abstract

Abstract

The diving SAR usually adopts the highly squinted mode and sub-aperture to satisfy the maneuvering and real-time processing. However, the existence of severe range-azimuth coupling, range-dependent squint angle and three-dimension velocity and acceleration leads to the space variance of range envelope and azimuth phase, which makes imagery unfocused seriously. To solve these problems, a Two-stage Frequency Filtering Algorithm (TsFFA) is proposed. After preprocessing, the First-stage Frequency Filtering (FsFF) factor is first introduced to correct azimuth-dependent Range Cell Migration (RCM) and realize the unified RCM correction. Furthermore, the Second-stage Frequency Filtering (SsFF) factor is adopted to equalize azimuth-dependent Doppler parameters and realize unified azimuth phase focused. Simulation results are presented to validate the effectiveness of the proposed approach.
- SAR,
- Sub-aperture,
- Diving highly squinted,
- Two-stage Frequency Filtering Algorithm (TsFFA),
- Two-Dimension (2-D) space-variance correction

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References(12)

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