基于轨道角动量的电磁涡旋SAR成像新方法
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摘要
为研究电磁涡旋波在合成孔径雷达(SAR)领域的应用潜力,验证电磁涡旋SAR成像的可行性,将电磁涡旋与合成孔径雷达模型结合,通过使用单一模式的轨道角动量,用合成孔径原理实现方位聚焦。给出了基于电磁涡旋的SAR几何模型和回波信号模型,并提出了适用于电磁涡旋SAR的改进chirp-scaling(CS)成像算法。通过点目标仿真分析,验证了所提成像算法的有效性。该方法可为SAR系统新体制设计及雷达的研究提供参考。
The imaging potential of orbital angular momentum(OAM) based electromagnetic(EM) vortex in synthetic aperture radar(SAR) field is studied in this paper. EM vortex and SAR model are innovatively combined, and focus in azimuth is realized based on synthetic aperture principle by use of single-mode OMA. In this paper, a novel imaging algorithm of EM vortex SAR based on the chirp-scaling algorithm is proposed, in which the radar is moving and OAM mode is fixed as a constant. The SAR geometry model and echo signal model of EM vortex are deduced, and a modified CS imaging algorithm is proposed. Simulations of point-like targets validate the effectiveness of the proposed imaging algorithm, which paves the way for the design of new mechanism SAR system and the research of the radar.
The imaging potential of orbital angular momentum(OAM) based electromagnetic(EM) vortex in synthetic aperture radar(SAR) field is studied in this paper. EM vortex and SAR model are innovatively combined, and focus in azimuth is realized based on synthetic aperture principle by use of single-mode OMA. In this paper, a novel imaging algorithm of EM vortex SAR based on the chirp-scaling algorithm is proposed, in which the radar is moving and OAM mode is fixed as a constant. The SAR geometry model and echo signal model of EM vortex are deduced, and a modified CS imaging algorithm is proposed. Simulations of point-like targets validate the effectiveness of the proposed imaging algorithm, which paves the way for the design of new mechanism SAR system and the research of the radar.
引文
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[7] 郭桂蓉, 胡卫东, 杜小勇. 基于电磁涡旋的雷达目标成像[J]. 国防科技大学学报, 2013, 35(6):71-76.
[8] LIU K, CHENG Y, YANG Z, et al. Orbital angular momentum based electromagnetic vortex imaging[J]. IEEE Antennas Wireless Propag. Lett, 2015, 14: 711-714.
[9] YUAN T, WANG H, QIN Y, et al. Electromagnetic vortex imaging using uniform concentric circular arrays[J]. IEEE Antennas Wireless Propag. Lett, 2016, 15: 1024-1027.
[10] LIU K, CHENG Y, LI X, et al. Study on the theory and method of vortex-electromagnetic-wave-based radar imaging[J]. IET Microwaves, Antennas and Propagation, 2016, 10(9): 961-968.
[11] 陈筠力,李威. 国外SAR卫星最新进展与趋势展望[J]. 上海航天,2016,33(6):1-19.
[12] 蔡爱民, 王燕宇. 双/多基地 SAR 成像研究进展与趋势及其关键技术[J]. 上海航天, 2016,33(4): 112-118.
[13] RANEY R K, RUNGE H, BAMLER R, et al. Precision SAR processing using chirp scaling[J]. IEEE Transactions on Geoscience and Remote Sensing, 1994, 32(4):786-799.
[14] YUAN T, CHENG Y, WANG H, et al. Beam steering for electromagnetic vortex imaging using uniform circular arrays[J]. IEEE Antennas and Wireless Propagation Letters, 2017, 16: 704-707.
[2] BOZINOVIC N, YUE Y, REN Y, et al. Terabit-scale orbital angular momentum mode division multiplexing in fibers[J]. Science, 2013, 340(6140): 1545-1548.
[3] MAHMOULI F E, WALKER S D. 4-Gbps uncompressed video transmission over a 60-GHz orbital angular momentum wireless channel[J]. IEEE Wireless Communications Letters, 2013, 2(2): 223-226.
[4] TAMBURINI F, MARI E, SPONSELLI A, et al. Encoding many channels on the same frequency through radio vorticity: first experimental test[J]. New Journal of Physics, 2012, 14(3): 033001.
[5] CANO E, ALLEN B, BAI Q, et al. Generation and detection of OAM signals for radio communications [C]//Antennas and Propagation Conference (LAPC). 2014: 637-640.
[6] BAI Q, TENNANT A, ALLEN B. Experimental circular phased array for generating OAM radiobeams[J]. Electronics Letters, 2014, 50(20): 1.
[7] 郭桂蓉, 胡卫东, 杜小勇. 基于电磁涡旋的雷达目标成像[J]. 国防科技大学学报, 2013, 35(6):71-76.
[8] LIU K, CHENG Y, YANG Z, et al. Orbital angular momentum based electromagnetic vortex imaging[J]. IEEE Antennas Wireless Propag. Lett, 2015, 14: 711-714.
[9] YUAN T, WANG H, QIN Y, et al. Electromagnetic vortex imaging using uniform concentric circular arrays[J]. IEEE Antennas Wireless Propag. Lett, 2016, 15: 1024-1027.
[10] LIU K, CHENG Y, LI X, et al. Study on the theory and method of vortex-electromagnetic-wave-based radar imaging[J]. IET Microwaves, Antennas and Propagation, 2016, 10(9): 961-968.
[11] 陈筠力,李威. 国外SAR卫星最新进展与趋势展望[J]. 上海航天,2016,33(6):1-19.
[12] 蔡爱民, 王燕宇. 双/多基地 SAR 成像研究进展与趋势及其关键技术[J]. 上海航天, 2016,33(4): 112-118.
[13] RANEY R K, RUNGE H, BAMLER R, et al. Precision SAR processing using chirp scaling[J]. IEEE Transactions on Geoscience and Remote Sensing, 1994, 32(4):786-799.
[14] YUAN T, CHENG Y, WANG H, et al. Beam steering for electromagnetic vortex imaging using uniform circular arrays[J]. IEEE Antennas and Wireless Propagation Letters, 2017, 16: 704-707.