基于GPU并行处理的SAR回波仿真器设计方法
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摘要
针对合成孔径雷达(SAR)设计了一种基于GPU的回波仿真器,使用并行计算的方法提高SAR回波模拟的效率。仿真数字回波信号通过数/模转换,转换为射频信号输出给SAR系统。使用了BP成像算法对仿真器模拟得到的点目标及分布式目标回波数据进行成像处理,验证了提出的SAR回波仿真器的有效性。实验分析表明,使用GPU并行处理的方法提高了SAR回波仿真的效率。
A synthetic aperture radar( SAR) echo simulator based on GPU with parallel processing is designed. The efficiency of SAR echo simulation is improved by parallel computation. The simulated digital signal of SAR echo is converted to an RF signal by a digital-to-analog converter(DAC) and transmitted to the SAR system. BPA( back projection algorithm) was introduced to obtain the images of point target and distributed target whose echoes were acquired by using the SAR echo simulator, which validated the proposed SAR echo simulator design method. Experiments show that the proposed method improves the efficiency of SAR echo simulation compared with the CPU processing method.
A synthetic aperture radar( SAR) echo simulator based on GPU with parallel processing is designed. The efficiency of SAR echo simulation is improved by parallel computation. The simulated digital signal of SAR echo is converted to an RF signal by a digital-to-analog converter(DAC) and transmitted to the SAR system. BPA( back projection algorithm) was introduced to obtain the images of point target and distributed target whose echoes were acquired by using the SAR echo simulator, which validated the proposed SAR echo simulator design method. Experiments show that the proposed method improves the efficiency of SAR echo simulation compared with the CPU processing method.
引文
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[3] Salvador L D,Bemad P,Fidalgo A,et al. IFSAR:an airborne interferometric SAR simulator[C]//IEEE International Geoscience and Remote Sensing Symposium. 2004:3349-3352.
[4] Zhang F,Hu C,Li W,et al. A deep collaborative computing based SAR raw data simulation on multiple CPU/GPU platform[J]. IEEE Journal of Selected Topics in Applied Earth Observations&Remote Sensing,2017(2):387-399.
[5]姜祝,韩松.基于LabVIEW的机载SAR回波模拟器设计[J].电子测量技术,2009,32(7):98-101.
[6]林愿,吴淑泉,姜发玉.基于PCI接口的合成孔径雷达目标模拟器的设计与实现[J].测控技术,2005,24(3):42-48.
[7]张玉宪,袁常顺.合成孔径雷达回波模拟器[J].太赫兹科学与电子信息学报,2016,14(4):541-544.
[8]保铮,邢孟道,王彤.雷达成像技术[M].北京:电子工业出版社,2005.
[9]谢亚楠.电磁场理论[M].北京:清华大学出版社,2011.
[10]翟新刚.基于BP算法的SAR成像及干涉条纹生成的GPU实现[D].北京:中国科学院大学,2016.