超大前斜视空空弹载SAR成像实现方法研究
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摘要
探讨了将合成孔径雷达成像技术应用于空空导弹制导的可行性。在理论分析的基础上,空空弹载SAR优选burst工作模式,在合理简化空间几何模型的基础上,推导了基于相对运动速度的斜视等效距离模型表达式,给出了带有三次相位误差修正的ECS成像算法,基于多普勒方程和空间几何模型推导了图像几何校正的公式,最后通过计算机仿真给出了前斜视角为15.01度的两组毫米波成像结果及点目标图像质量评估结果,验证了工作模式选择的正确性和成像算法的有效性。
This paper investigated the feasibility of the application of synthetic aperture radar(SAR) technique to the air-to-air missile(AAM) control and guidance.Air-to-air missile-borne SAR was proposed to work in the burst mode in terms of the attack characteristic of AAM and the imaging requirements of SAR.At the basis of the simplified space geometry mode,the expression of the equivalent range was deduced,which was correlated with the relative velocity between the missile and the target.An Extended Chirp Scaling(ECS) algorithm with range thrice phase error correction was applied to air-to-air missile-borne SAR.The formulas for geometric correction were deduced based on the Doppler equation.Two groups of simulation results are given under 15.01 degrees forward-looking squint angle,which demonstrate the validity of the image formation and the work mode choice of air-to-air missile-borne SAR.
This paper investigated the feasibility of the application of synthetic aperture radar(SAR) technique to the air-to-air missile(AAM) control and guidance.Air-to-air missile-borne SAR was proposed to work in the burst mode in terms of the attack characteristic of AAM and the imaging requirements of SAR.At the basis of the simplified space geometry mode,the expression of the equivalent range was deduced,which was correlated with the relative velocity between the missile and the target.An Extended Chirp Scaling(ECS) algorithm with range thrice phase error correction was applied to air-to-air missile-borne SAR.The formulas for geometric correction were deduced based on the Doppler equation.Two groups of simulation results are given under 15.01 degrees forward-looking squint angle,which demonstrate the validity of the image formation and the work mode choice of air-to-air missile-borne SAR.
引文
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[5]Moreira Alberto,Mittermayer Josef and Scheiber Rolf.Extended chirpscaling algorithm for air and spaceborne SAR data processing in strip-map and scanSAR imaging modes[J].IEEE Transactions on Geo-science and Remote Sensing,1996,34(5):1123-1136
[6]Mittermayer J,Scheiber R and Moreira A.The Extended Chirp ScalingAlgorithm for ScanSAR Data Processing[In].In Proc.European Con-ference on Synthetic Aperture Radar[C],EUSAR’96,Konigswinter,Germany,1996,3:517-520
[7]黄岩,李春升,陈杰,周荫清.高分辨率星载SAR改进ChirpScaling成像算法[J].电子学报,2000.3,28(3):35-38[HUANGYan,LI Chun-sheng,CHEN Jie,ZHOU Yin-qing.Refined chirpscaling algorithm for high resolution spaceborne SAR imaging[J].AC-TA ELECTRONICA SINICA.2000,28(3):35-38]
[8]陈杰,黄岩,李春升,周荫清.基于非线性FM滤波的SC-ChirpScaling算法[J].电子学报,2000.12,28(12):5-7[CHEN Jie,HUANG Yan,LI Chun-sheng,ZHOU Yin-qing.SC-chirp scaling al-gorithm based on nonlinear FM filter[J].ACTA ELECTRONICA SINI-CA.2000,28(12):5-7]
[9]宁书年,吕松棠,杨小勤.遥感图像处理与应用[M].北京:地震出版社,1995[NING Shu-nian,LU Song-tang,YANG Xiao-qin,etc.Romote image processing and appliacation[M].Beijing:Earth-quake Press,1995]
[2]魏钟铨,等.合成孔径雷达卫星[M].北京:科学出版社,2001[WEI Zhong-quan.Synthetic Aperture Radar Satellite[M].Beijing:Science Press,2001]
[3]Schmidt A R.Secondary Range Compression for Improved RangeDoppler Processing of SAR Data with High Squint[In].Master’s the-sis,The University of British Columbia,1986,9
[4]Sack M,Ito M R,Cumming I G.Application of efficient linear FMmatched filtering algorithms to synthetic aperture radar processing[J].IEE Proc.part.F,1985,132:45-57
[5]Moreira Alberto,Mittermayer Josef and Scheiber Rolf.Extended chirpscaling algorithm for air and spaceborne SAR data processing in strip-map and scanSAR imaging modes[J].IEEE Transactions on Geo-science and Remote Sensing,1996,34(5):1123-1136
[6]Mittermayer J,Scheiber R and Moreira A.The Extended Chirp ScalingAlgorithm for ScanSAR Data Processing[In].In Proc.European Con-ference on Synthetic Aperture Radar[C],EUSAR’96,Konigswinter,Germany,1996,3:517-520
[7]黄岩,李春升,陈杰,周荫清.高分辨率星载SAR改进ChirpScaling成像算法[J].电子学报,2000.3,28(3):35-38[HUANGYan,LI Chun-sheng,CHEN Jie,ZHOU Yin-qing.Refined chirpscaling algorithm for high resolution spaceborne SAR imaging[J].AC-TA ELECTRONICA SINICA.2000,28(3):35-38]
[8]陈杰,黄岩,李春升,周荫清.基于非线性FM滤波的SC-ChirpScaling算法[J].电子学报,2000.12,28(12):5-7[CHEN Jie,HUANG Yan,LI Chun-sheng,ZHOU Yin-qing.SC-chirp scaling al-gorithm based on nonlinear FM filter[J].ACTA ELECTRONICA SINI-CA.2000,28(12):5-7]
[9]宁书年,吕松棠,杨小勤.遥感图像处理与应用[M].北京:地震出版社,1995[NING Shu-nian,LU Song-tang,YANG Xiao-qin,etc.Romote image processing and appliacation[M].Beijing:Earth-quake Press,1995]
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