自适应角度-多普勒补偿(Adaptive Angle Doppler Compensation,A2DC)算法可在惯导参数未知的情况下解决非正侧视阵列中由杂波距离相关性引起的非均匀问题,但该算法运算量大、工程实现困难。本文首先对A2DC算法的基本工作原理进行了深入的分析,在此基础上,针对算法运算量大的缺点,将分块处理和近似投影子空间跟踪(Projection Approximation Subspace Tracking,PAST)技术引入到A2DC算法中,提出一种快速自适应角度-多普勒补偿(Fast Adaptive Angle Doppler Compensation, FA2DC)算法。与常规的A2DC算法相比,二者补偿性能相当,但FA2DC算法的运算量显著降低。系统仿真验证了此算法的有效性。
The adaptive angle Doppler compensation (A2DC) method can be applied to compensate for the clutter range dependence for non-sidelooking arrays without requiring any navigation data. However, this method suffers from a serious drawback of high computational complexity which limits its real-time application. In this paper, the principle of the A2DC method is first investigated. Then, to address the computational burden, a block processing and projection approximation subspace tracking (PAST) technique is inserted into the A2DC method and a fast A2DC (FA2DC) method is proposed. Simulation results are presented to show that these two compensation methods demonstrate approximately the same performance, but the proposed method reduces the computational complexity significantly.
[1] Borsari G K. Mitigating effects on STAP processing caused by an inclined array // Proceedings of IEEE Radar Conference. 1998: 135-140.
[2] Kreyenkamp O, Klemm R. Doppler compensation in forward-looking STAP radar [J]. IEE Proceedings-Radar, Sonar, and Navigation, 2001, 148(5): 253-258.
[3] 谢文冲, 王永良. 基于CMT技术的非正侧面阵机载雷达杂波抑制方法研究[J]. 电子学报, 2007, 35(3): 441-444. Xie Wenchong, Wang Yongliang. Study on clutter suppression approach to airborne phased radar with non-sidelooking arrays based on CMT [J]. Acta Electronica Sinica, 2007, 35(3): 441-444. (in Chinese)
[4] Colone F, Fornari M, Lombardo P. A spectral slope-based approach for mitigating bistatic STAP clutter dispersion // Proceedings of IEEE Radar Conference. 2007: 408-413.
[5] Himed B, Zhang Y H, Hajjari A. STAP with angle-Doppler compensation for bistatic airborne radar // Proceedings of IEEE Radar Conference.2002: 311-317.
[6] Himed B. Effects of bistatic clutter dispersion on STAP system [J]. IEE Proceedings-Radar, Sonar and Navigation, 2003, 150(1): 28-32.
[7] Melvin W L, Himed B, Davis M E. Doubly adaptive bistatic clutter filtering //Proceedings of IEEE Radar Conference. 2003: 171-178.
[8] Melvin W L, Davis M. E. Adaptive cancellation method for geometry-induced nonstationary bistatic clutter environments [J]. IEEE Transactions on Aerospace and Electronic System, 2007, 43(2): 651-672.
[9] Yang B. Projection approximation subspace tracking [J]. IEEE Transactions on Signal Processing, 1995, 43(1): 95-107.
[10] Pillai S U, Kim Y L, Guerci J R. Generalized forward/backward sub-aperture smoothing techniques for sample starved STAP [J]. IEEE Transactions on Signal Processing, 2000, 48(12): 3569-3574.
[11] Zatman M, Marshall D. Forward-backward averaging in the presence of array manifold errors [J]. IEEE Transactions on Antennas Propagation, 1998, 46(11): 1700-1704.
[12] Klemm R. Space-time adaptive processing: principles and applications [M]. London: Institution of Electrical Engineers, 2002: 69-115.
[13] Reed I S, Mallett J D, Brennan L E. Rapid convergence rate in adaptive arrays [J]. IEEE Transactions on Aerospace and Electronic System, 1974, 10(6): 853-863.
[14] Ward J. Space-time adaptive processing for airborne radar . Technical Report ESC-94-109, Lincoln Laboratory, 1994.
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