Abstract:In the missile borne subaperture SAR mode, the complicate motion of the platform and the strong coupling between range and azimuth present substantial difficulty for echo data processing. To solve this problem, the range migration characteristics of the echo are analyzed and a secondary frequency function is introduced for uniform migration correction. During the azimuth processing, the azimuth frequency domain projection is applied to compensating the Doppler frequency modulation variation. Compared with the traditional algorithm, this proposed algorithm can focus the echo more effectively. Simulation results show the correctness and validity of the proposed algorithm.
YI Yusheng, ZHANG Linrang, LIU Nan, et al. Imaging algorithm for missile-borne SAR with diving acceleration based on series reversion[J]. Systems Engineering & Electronics, 2009, 31(12): 2563-2568.
ZHOU Peng, ZHOU Song, XIONG Tao, et al. A chirp-Z transform imaging algorithm for missile borne SAR with diving maneuver based on the method of series reversion[J]. Journal of Electronics & Information Technology, 2010, 32(12): 1806-1808. doi: 10.3724/SP.J.1146.2010.00452.
ZHOU Song, BAO Min, ZHOU Peng, et al. An imaging algorithm for missile-borne SAR with downward movement based on azimuth nonlinear chirp scaling[J]. Journal of Electronics & Information Technology, 2011, 33(6): 1420-1426. doi: 10.3724/SP.J.1146.2010.01124.
[4]
TANG Shiyang, ZHANG Linrang, GUO Ping, et al. An Omega-K algorithm for highly squinted missile-borne SAR with constant acceleration[J]. IEEE Geoscience and Remote Sensing Letters, 2014, 9(11): 1569-1602. doi: 10.1109/LGRS. 1014.2301718.
LI Zhenyu, LIANG Yi, XING Mengdao, et al. A frequency phase filtering imaging algorithm for highly squint missile- borne synthetic aperture radar with subaperture[J]. Journal of Electronics & Information Technology, 2015, 37(4): 954-959. doi: 10.11999/JEIT140618.
[6]
ZENG Tao, LI Yinghe, DING Zegang, et al. Subaperture approach based on azimuth-dependent range cell migration correction and azimuth focusing parameter equalization for maneuvering high-squint-mode SAR omega-K algorithm for highly squinted missile-borne SAR with constant acceleration [J]. IEEE Geoscience and Remote Sensing, 2015, 53(12): 6719-6733. doi: 10.1109/TGRS.015.2447393.
[7]
LIU Gaogao, LI Peng, TANG Shiyang, et al. Focusing highly squinted data with motion errors based on modified non- linear chirp scaling[J]. IET Radar, Sonar and Navigation. 2013, 12(20): 568-612. doi: 10.1049/iet-rsn.2012.0134.
DONG Qi, SUN Guangcai, YANG Zemin, et al. Cartesian coordinates factorized back-projection algorithm for spotlight SAR[J]. Journal of Electronics & Information Technology, 2016, 38(6): 1482-1488. doi: 10.11999/JEIT150990.
LV Youxin, ZHANG Mingyou, and XIANG Jingchen. A method for reducing sidelobe of linear frequency modulated pulse compression signal[J]. Journal of University of Electronic Science and Technology of China, 1993, 22(4): 344-349.