基于FMCW的大斜视SAR成像研究

梁毅; 王虹现; 邢孟道; 保铮

doi:10.3724/SP.J.1146.2007.01851

基于FMCW的大斜视SAR成像研究

doi: 10.3724/SP.J.1146.2007.01851

基金项目:

国家自然科学青年基金(60502044)和教育部重点项目(20051009)资助课题

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出版历程
- 收稿日期: 2007-11-29
- 修回日期: 2008-05-17
- 刊出日期: 2009-04-19

Imaging Study of High Squint SAR Based on FMCW

摘要

摘要: 针对调频连续波SAR与脉冲式SAR工作体制的不同，从而带来不同的回波信号形式，该文对基于调频连续波的大斜视SAR回波信号进行建模，分析信号的特征，揭示平台的连续运动在距离向产生一个多普勒频移的特性，从而导致目标的径向移动。同时，针对调频连续波SAR大斜视Dechirp数据，提出了时域走动校正、频域多普勒频移校正、距离弯曲校正的改进R-D算法，仿真数据处理结果验证了该文分析的正确性和所提算法的有效性。另外，对于平台连续运动引入的多普勒频移，该文也分析了其对成像造成的影响。
- 调频连续波;大斜视SAR;改进R-D算法
Abstract: Based on the differences of work mechanism between Frequency Modulated Continuous Wave (FMCW) Synthetic Aperture Radar (SAR) and Pulsed Synthetic Aperture Radar, which leads to different form of received signal, this paper establishes the model of high squint FMCW SAR echo, analyzes its characteristics, and reveals the Doppler frequency shift effect induced by the continuous motion in range direction while radar transmitting and receiving signal. Meanwhile, this paper proposes a modified RD Algorithm (RDA) for high squint FMCW SAR dechirp data, which compensates for range walk in time domain, Doppler frequency shift and range curvature in frequency domain. Point target simulation verifies the analysis and validity of the algorithm. In addition, for the Doppler frequency shift induced by the platform continuous motion, this paper also analyses its effect on imaging.

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参考文献(1)

Meta A and Hoogeboom P. Development of signal processingalgorithms for high resolution airborne millimeter waveFMCW SAR. Rroc. IEEE Int. Radar Conf. 05, Arlington,U.S.A, 2005: 326-331.[2]Meta A.[J].de Wit J J M, and Hoogeboom P. Development ofhigh resolution airborne millimeter wave FM-CW SAR. Proc.EuRAD04, Amsterdam, Netherlands.2004,:-[3]Zaugg E C.[J].Hudson D L, and Long D G. The BYU uSAR: Asmall, student-built SAR for UAV operation. Proc.IGARSS06, Denver, CO, USA.2006,:-[4]Edrich M. Ultra-lightweight synthetic aperture radar basedon a 35GHz FMCW sensor concept and online raw datatransmission[J].IEE Proc., Radar Sonar Naving.2006, 153(2):129-134[5]Stove A G. Linear FMCW radar techniques. IEE Proc.,Radar Sonar Naving., 1992, 139(5): 343-350.[6]de Wit J J M, Meta A, and Hoogeboom P. Modifiedrange-Doppler processing for FM-CW synthetic apertureradar[J].IEEE Geosci. Remote Sensing Letters.2006, 3(1):83-87[7]张欢. 基于实测数据的斜视SAR成像算法研究. [硕士论文],西安电子科技大学, 2006.[8]Meta A, Hoogeboom P, and Lightart L. Correction of theeffects induced by the continuous motion in airborne FMCWSAR. Proc. IEEE Radar Conf. 06, Verona NY, USA, Apr.2006: 358-365.[9]保铮, 邢孟道, 王彤编著. 雷达成像技术. 北京:电子工业出版社, 2005: 25.[10]Meta A and Hoogeboom P. Signal processing algorithms forFMCW moving target indicator synthetic aperture radar.Proc. IGARSS05, Seoul, Korea, July 2005: 316-319.黄源宝. 机载合成孔径雷达成像算法及运动补偿的研究, [博士论文], 西安电子科技大学, 2005.

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