Medium-earth-orbit SAR Data Focusing Method Based on Two-step Azimuth Resampling

Wenkang LIU; Guobin JING; Guangcai SUN; Quan CHEN; Mengdao XING

doi:10.11999/JEIT180238

Volume 41 Issue 1

Jan. 2019

Turn off MathJax

Article Contents

Article Navigation > Journal of Electronics & Information Technology > 2019 > 41(1): 136-142

Wenkang LIU, Guobin JING, Guangcai SUN, Quan CHEN, Mengdao XING. Medium-earth-orbit SAR Data Focusing Method Based on Two-step Azimuth Resampling[J]. Journal of Electronics & Information Technology, 2019, 41(1): 136-142. doi: 10.11999/JEIT180238

Citation:

Wenkang LIU, Guobin JING, Guangcai SUN, Quan CHEN, Mengdao XING. Medium-earth-orbit SAR Data Focusing Method Based on Two-step Azimuth Resampling[J]. Journal of Electronics & Information Technology, 2019, 41(1): 136-142. doi: 10.11999/JEIT180238

Citation:

PDF( 2684 KB)

Medium-earth-orbit SAR Data Focusing Method Based on Two-step Azimuth Resampling

doi: 10.11999/JEIT180238

Wenkang LIU^{1, 2
,
,},
Guobin JING³,
Guangcai SUN^{1, 2},
Quan CHEN^{1, 2},
Mengdao XING^{1, 2}

1.
National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China
2.
Collaborative Innovation Center of Information Sensing and Understanding, Xidian University, Xi’an 710071, China
3.
Milimeter Wave Imaging Technology Laboratory, Shanghai Institute of Satellite Engineering, Shanghai 201109, China

Funds: The National Key R&D Program of China (2017YFC1405600), The Foundation for Innovotive Research Groups of the National Natural Science Foundation of China (61621005), The Fundamental Research Funds for the Central Universities (JB180213)

Received Date: 2018-03-14
Rev Recd Date: 2018-09-19

Available Online: 2018-10-08

Publish Date: 2019-01-01

Abstract

Abstract

The obvious orbit curvature of Medium Earth Orbit (MEO) results in severe two-dimensional space variance in the received signals. Thus, the focusing of MEO SAR data is still a problem to be solved. Fourth-order polynomial is used to model the range history. Also, an azimuth two-step resampling method is proposed to address the azimuth variance. The azimuth resampling in the time domain can adjust the azimuth chirp rate to be the same, then CS/RMA algorithm can be used to handle the space variance of the RCM. The second-step azimuth resampling can correct the left space variance of the Doppler parameters, including range-azimuth coupled space variance of the azimuth chirp rate, and the higher-order focusing parameters. The proposed method can well address the azimuth space variance of the whole scene, make the conventional frequency-domain focusing algorithms applicable to large scene focusing. Finally, the comparison results obtained by the proposed method and the reference method, validate the effectiveness of the proposed method.
- Medium Earth Orbit (MEO) SAR,
- Space variance,
- Two-step resampling

FullText(HTML)

References(21)

References

ROLF W and STEFAN B. The TerraSAR-X mission and system design[J]. IEEE Transactions on Geoscience and Remote Sensing, 2010, 48(2): 606–615. doi: 10.1109/TGRS.2009.2031062

ZHANG Tianyi, DING Zegang, TIAN Weiming, et al. A 2-D nonlinear chirp scaling algorithm for high squint GEO SAR imaging based on optimal azimuth polynomial compensation[J]. IEEE Journal of Selected Topics in Applied Earth Observations And Remote Sensing, 2017, 10(12): 5724–5735. doi: 10.1109/JSTARS.2017.2765353

STEPHEN H. System design for geosynchronous synthetic aperture radar missions[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(12): 7750–7763. doi: 10.1109/TGRS.2014.2318171

JALAL M, PACO L D, and GERHARD K. Potentials and limitations of MEO SAR[C]. European Conference on Synthetic Aperture Radar, Hamburg, Germany, 2016: 1–5.

TIAN Ye, HU Cheng, DONG Xichao, et al. Theoretical analysis and verification of time variation of background ionosphere on geosynchronous SAR imaging[J]. IEEE Geoscience and Remote Sensing Letters, 2015, 12(4): 721–725. doi: 10.1109/LGRS.2014.2360235

LI Liang, HONG Jun, and MING Feng. Study about ionospheric effects on medium-earth-orbit SAR imaging[C]. 2014 IEEE Radar Conference, Cincinnati, USA, 2014: 27–31.

温雪娇, 仇晓兰, 尤红建, 等. 高分辨率星载SAR起伏运动目标精聚焦与参数估计方法[J]. 雷达学报, 2017, 6(2): 213–220. doi: 10.12000/JR17005

WEN Xuejiao, QIU Xiaolan, YOU Hongjian, et al. Focusing and parameter estimation of fluctuating targets in high resolution space-borne SAR[J]. Journal of Radars, 2017, 6(2): 213–220. doi: 10.12000/JR17005

HUANG Lijia, QIU Xiaolan, HU Donghui, et al. Focusing of medium-earth-orbit SAR with advanced nonlinear chirp scaling algorithm[J]. IEEE Transactions on Geoscience and Remote Sensing, 2011, 49(1): 500–508. doi: 10.1109/TGRS.2010.2053211

BAO Ming, XING Mengdao, LI Yachao, et al. Two-dimensional spectrum for MEO SAR processing using a modified advanced hyperbolic range equation[J]. Electronics Letters, 2011, 47(18): 1043–1045. doi: 10.1049/el.2011.1322

TANG Shiyang, LIN Chunhui, ZHOU Yu, et al. Processing of long integration time spaceborne SAR data with curved orbit[J]. IEEE Transactions on Geoscience and Remote Sensing, 2018, 52(2): 888–904. doi: 10.1109/TGRS.2017.2756109

CHEN Jie, KUANG Hui, YANG Wei, et al. A novel imaging algorithm for focusing high-resolution spaceborne SAR data in squinted sliding-spotlight mode[J]. IEEE Geoscience and Remote Sensing Letters, 2016, 13(10): 1577–1581. doi: 10.1109/LGRS.2016.2598066

RICHARD B. A comparison of range-Doppler and wavenumber domain SAR focusing algorithms[J]. IEEE Transactions on Geoscience and Remote Sensing, 1992, 30(4): 706–713. doi: 10.1109/36.158864

HUANG Lijia, QIU Xiaolan, HU Donghui, et al. Medium-Earth-Orbit SAR focusing using range Doppler algorithm with integrated two-step azimuth perturbation[J]. IEEE Geoscience and Remote Sensing Letters, 2015, 12(3): 626–630. doi: 10.1109/LGRS.2014.2353674

WANG Yan, LI Jingwen, XU Feng, et al. A new nonlinear chirp scaling algorithm for high-squint high-resolution SAR imaging[J]. IEEE Geoscience and Remote Sensing Letters, 2017, 14(12): 2225–2229. doi: 10.1109/LGRS.2017.2758386

LI Zhenyu, XING Mengdao, LIANG Yi, et al. A frequency-domain imaging algorithm for highly squinted SAR mounted on maneuvering platforms with nonlinear trajectory[J]. IEEE Transactions on Geoscience and Remote Sensing, 2016, 54(7): 4023–4038. doi: 10.1109/TGRS.2016.2535391

LI Zhenyu, LIANG Yi, XING Mengdao, et al. An improved range model and omega-k-based imaging algorithm for high-squint SAR with curved trajectory and constant acceleration[J]. IEEE Geoscience and Remote Sensing Letters, 2016, 13(5): 656–660. doi: 10.1109/LGRS.2016.2533631

LI Dexin, WU Manqing, SUN Zaoyu, et al. Modeling and processing of two-dimensional spatial-variant geosynchronous SAR data[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2015, 8(8): 3999–4009. doi: 10.1109/JSTARS.2015.2418814

DAVIDE D and ANDREA M G. High-resolution spaceborne SAR focusing by SVD-Stolt[J]. IEEE Geoscience and Remote Sensing Letters, 2007, 4(4): 639–643. doi: 10.1109/LGRS.2007.903081

CHEN Jianlai, SUN Guangcai, YANG Jun, et al. A TSVD-NCS algorithm in range-Doppler domain for geosynchronous synthetic aperture radar[J]. IEEE Geoscience and Remote Sensing Letters, 2016, 13(11): 1631–1635. doi: 10.1109/LGRS.2016.2599224

HAUKE F, ELKE B, and JOSEF M. Total zero Doppler steering—A new method for minimizing the Doppler centroid[J]. IEEE Geoscience and Remote Sensing Letters, 2005, 2(2): 141–145. doi: 10.1109/LGRS.2005.844591

DANIEL P S. Analytic yaw-pitch steering for side-looking SAR with numerical roll algorithm for incidence angle[J]. IEEE Transactions on Geoscience and Remote Sensing, 2012, 50(9): 3587–3594. doi: 10.1109/TGRS.2012.2183375

Relative Articles

Supplements(0)

Cited By

Proportional views