Imaging and MTI processing based on dual-frequencies dual-apertures spaceborne SAR
Tóm tắt
Based on dual-frequencies dual-apertures spaceborne SAR (Synthetic Aperture Radar), a new SAR system with four receiving channels and two operation modes is presented in this paper. SAR imaging and Moving Target Indication (MTI) are studied in this system. High resolution imaging with wide swath is implemented by the Mode I, and MTI is completed by the Mode II. High azimuth resolution is achieved by the Displaced Phase Center (DPC) multibeam technique. And the Coherent Accumulation (CA) method, which combines dual channels data of different carrier frequency, is used to enhance the range resolution. For the data of different carrier frequency, the two aperture interferometric processing is executed to implement clutter cancellation, respectively. And the couple of clutter suppressed data are employed to implement Dual Carrier Frequency Conjugate Processing (DCFCP), then both slow and fast moving targets detection can be completed, followed by moving target imaging. The simulation results show the validity of the signal processing method of this new SAR system.
Tài liệu tham khảo
Tim J. Nohara, Peter Weber, Al Premji, et al. SARGMTI processing with Canada’s Radarsat 2 satellite. Adaptive Systems for Signal Processing, Communications, and Control Symposium 2000 (AS-SPCC), Lake Louise, Alta, Canada, 2000, 379–384.
M. Suess, S. Riegger, W. Pitz, et al. Terra SAR-X: Design and performance. The 4th European Conference on Synthetic Aperture Radar, Cologne, Germany, 2002, 49–52.
M. Suess, B. Grafmueller, and R. Zahn. A novel high resolution, wide swath SAR system. Geoscience and Remote Sensing Symposium, 2001 (IGARSS’01), Friedrichshafen, Germany, 2001, 1013–1015.
Yadin Eli. A performance evaluation model for a two port interferometer SAR-MTI. 1996 IEEE National Radar Conferences, Michigan, USA, 1996, 261–266.
R. T. Lord and M. R. Inggs. High resolution SAR processing using stepped-frequencies. Proc. IEEE Geoscience Remote Sensing Symposium IGARSS’97, Toronto, Canada, 1997, 490–492.
J. Dorey, G. Garnier, and G. Auvray. RIAS, synthetic impulse and antenna radar. International Conference on Radar, Paris, 1989, 556–562.
Yin Jian-feng, Li Dao-jing, Tang Li-bo, et al. Spaceborne SAR detecting and imaging of airborne moving targets. Acta Electronica Sinica, 35(2007)6, 1032–1036 (in Chinese). 尹建凤, 李道京, 汤立波, 等. 星载SAR的空中运动目标检测和成像. 电子学报, 35(2007)6, 1032–1036.
G.-Y. Wang, X.-G. Xia, V. C. Chen, et al. Detection, location, and imaging of fast moving targets using multifrequency antenna array SAR. IEEE Trans. Aerosp. Electron. Syst., 40(2004)1, 345–355.
Gang Li, Jia Xu, Ying-Ning Peng, et al. Bistatic linear antenna array SAR for moving target detection, location, and imaging with two passive airborne radars. IEEE Trans. on Geoscience and Remote Sensing, 45(2007)3, 554–565.
Lin Youquan, Ni Jinlin, Wang Dechun, and Zhang Guangyi. A new airborne slow-moving target detection method for mechanically scanned antennas. Journal of Electronics and Information Technology, 24(2002)4, 514–519 (in Chinese). 林幼权, 倪晋麟, 王德纯, 张光义. 一种适用于机械扫描天线的机载慢速运动目标检测新方法. 电子与信息 学报, 24(2002)4, 514–519.