星载聚束式SAR子孔径成像处理方法
A subaperture imaging approach of spaceborne spotlight SAR
-
摘要: 该文分析了星载聚束式SAR的信号特性。在分析比较几种常见聚束式SAR成像算法的基础上,引入适用于星载聚束式SAR成像的改进chirp scaling算法。为解决高分辨率星载聚束式SAR具有的脉冲重复频率(PRF)过高,多普勒带宽中心频率时变性等问题,深入分析了采用子孔径方法的必要性及其实现方法,并将子孔径方法结合到chirp scaling算法中。最后,通过计算机仿真,验证了该算法适用于高分辨率星载聚束式SAR成像处理。Abstract: Signal properties of spaceborne spotlight SAR. arc; discussed. Based on the analyses of a few .spotlight imaging algorithm, a modified chirp scaling algorithm for spaceborne spotlight SAR is proposed. Besides, a subaperture method is combined with the algorithm. In order to resolve high Pulse Repetition Frequency (PR.F) and the time-variant of Doppler center frequency, etc., the necessity and implementation approach of the subaperture method are analyzed thoroughly. The validity of the proposed method is tested by computer simulation.
-
W.G. Carrara, R. S. Goodman, R. M. Majewski, Spotlight Synthetic Aperture Radar, Boston,Artech House, 1995, 5-9.[2]黄岩,李春升,陈杰,周荫清,高分辨星载SAR改进Chirp Scaling成像算法,电子学报,2000,28(3),35-38.[3]G.W. Davidson, I. Cumming, Signal properties of spaceborne squint-mode SAR, IEEE Trans.on Geosci. Remote Sensing, 1997, 35(3), 611-617.[4]C. Prati, F. Rocca, Focusing SAR data with time-varying Doppler centroid, IEEE Trans. on Geosci. Remote Sensing, 1992, 30(3), 550 559.[5]Tat Soon Yeo, Ngee Leng Tan, Cheng Bo Zhang, Yi Hui Lu, A new subaperture approach to high squint SAR processing, IEEE Trans. on Geosci. Remote Sensing, 2001, 39(5), 954-968.[6]黄岩,高分辨率星载合成孔径雷达成象处理技术研究,[博士论文],北京航空航天大学,1999,第5章.[7]J. Mitternayer, A. Moreira, O. Loffeld, Spotlight SAR data proces sing using the frequency scaling algorit hm, IEEE Trans. on Geosci. Remote Sensing, 1999, 37(5), 2198-2214. -
计量
- 文章访问数: 2232
- HTML全文浏览量: 61
- PDF下载量: 739
- 被引次数: 0
下载:
