The existing approaches with missing data for SAR by Gapped-data Amplitude and Phase EStimation (GAPES) ignore the range migration and phase error, which lead to the decrease of the imaging quality. An imaging method of gapped-data for spotlight mode SAR based on GAPES is presented. It can correct the range migration using two-dimensional interpolation, realize autofucus from sparse data by sparse project approximation subspace tracking algorithm, and ensure the resolution of the image. The simulations and real data processing results show the validity of the proposed approach.
LARSSON E G , LIU G Q , STOICA P, et al. High-resolution SAR imaging with angular diversity[J]. IEEE Transactions on Aerospace and Electronic Systems, 2001, 37(4): 1359-1372.
[2]
GLENTIS G O, ZHAO Kexin, JAKOBSSON A , et al. Non-parametric high-resolution SAR imaging[J]. IEEE Transactions on Signal Processing, 2013, 61(7): 1614-1624.
FAN Haiyan, ZHOU Hanfei, and LI Yu. Multi-aspect SAR feature extraction via gapped-data amplitude and phase estimation[J]. Journal of Electronics & Information Technology, 2012, 34(12): 2920-2926. doi: 10.3724/SP.J.1146. 2012.00496.
[4]
BAI Xueru, ZHOU Feng, and XING Mengdao, et al. High- resolution radar imaging of air targets from sparse azimuth data[J]. IEEE Transactions on Aerospace and Electronic Systems, 2012, 48(2): 1643-1655
[5]
ALAN V O. Signals and System (Second Edition)[M]. 北京:电子工业出版社, 2010: 263-274.
[6]
GUPTA I J. High resolution radar imaging using 2D linear prediction[J]. IEEE Transactions on Antennas Propagation, 1994, 42(1): 31-37.
[7]
GUPTA I J, BEALS M J, and MOGHADDAR A. Data extrapolation for high-resolution radar imaging[J]. IEEE Transactions on Antennas and Propagation, 1994, 42(11): 1540-1545.
[8]
ERER I. A new data extrapolation algorithm for high resolution ISAR imaging[J]. International Journal of Electronics and Communications, 2006, 60(4): 316-319.
[9]
DONG Xiao and ZHANG Yunhua. A novel compressive sensing algorithm for SAR imaging[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014, 7(2): 708-720
[10]
FANG Jian, XU Zongben, ZHANG Bingchen, et al. Fast compressed sensing SAR imaging based on approximated observation[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014, 7(1): 352-363.
[11]
UGUR S, ARIKAN O, and CAFER GÜRBÜZ A. SAR image reconstruction by expectation maximization based matching pursuit[J]. Digital Signal Processing, 2015, 37: 75-84.
[12]
YANG Jungang, THOMPSON J, HUANG Xiaotao, et al. Segmented reconstruction for compressed sensing SAR imaging[J]. IEEE Transactions on Geoscience and Remote Sensing, 2013, 51(7): 4214-4225.
[13]
STOICA P, LARSSON E G, and LI J. Adaptive filterbank approach to restoration and spectral analysis of gapped data [J]. The Astronomical Journal, 2000, 120(4): 2163-2173.
[14]
LARSSON E G, STOICA P, and LI J. Amplitude spectrum estimation for two-dimensional gapped data[J]. IEEE Transactions on Signal Processing, 2002, 50(6): 1343-1354.
[15]
BAI Xueru, ZHOU Feng, WANG Qi, et al. Sparse subband imaging of space targets in high-speed motion[J]. IEEE Transactions on Geoscience and Remote Sensing, 2013, 51(7): 4144-4154.
MAO Xinhua. Study on the application of PFA in SAR ultra-high resolution imaging and SAR/GMTI[D]. [Ph.D. dissertation], Nanjing University of Aeronautics and Astronautics, 2009.
[17]
WAHL D E, EICHEL P H, et al. Phase gradient autofocus-a robust tool for high resolution SAR phase correction[J]. IEEE Transactions on Aerospace and Electronic Systems, 1994, 30(3): 827-835.
[18]
SNARSKI C A. Rank one phase error estimation for range- Doppler imaging[J]. IEEE Transactions on Aerospace and Electronic Systems, 1996, 32(2): 676-688.
[19]
俞翔. ISAR运动补偿和成像新方法的研究[D]. [博士论文], 南京航空航天大学, 2013.
YU Xiang. Research on new methods for ISAR motion compensation and imaging[D]. [Ph.D. dissertation], Nanjing University of Aeronautics and Astronautics, 2013.
JIANG Rui, ZHU Daiyin, SHEN Mingwei, et al. An autofocus algorithm for spotlight SAR imagery using a projection approximation subspace tracking approach[J]. Acta Electronica Sinica, 2012, 40(6): 1251-1256.