The frequency-modulated continuous-wave （FMCW） synthetic aperture radar （SAR） is a light-weight, cost-effective, high-resolution imaging radar, which is suitable for a small flight platform. The signal model is de...The frequency-modulated continuous-wave （FMCW） synthetic aperture radar （SAR） is a light-weight, cost-effective, high-resolution imaging radar, which is suitable for a small flight platform. The signal model is derived for FMCW SAR used in unmanned aerial vehicles （UAV） reconnaissance and remote sensing. An appropriate algorithm is proposed. The algorithm performs the range cell migration correction （RCMC） for continuous nonchirped raw data using the energy invariance of the scaling of a signal in the scale domain. The azimuth processing is based on step transform without geometric resampling operation. The complete derivation of the algorithm is presented. The algorithm performance is shown by simulation results.展开更多
FMCWSAR将调频连续波与合成孔径成像技术结合于一体，是一种新近被提出来的成像雷达体制，它以其体积小、重量轻、成本低、分辨率高等一系列优点，引起越来越多的关注。然而，在FMCWSAR系统中，雷达连续不断地发射信号，调制信号周期相...FMCWSAR将调频连续波与合成孔径成像技术结合于一体，是一种新近被提出来的成像雷达体制，它以其体积小、重量轻、成本低、分辨率高等一系列优点，引起越来越多的关注。然而，在FMCWSAR系统中，雷达连续不断地发射信号，调制信号周期相对较长，停一走（STOP AND GO）近似不再成立，所以要用合适的算法来实现成像。针对FMCW SAR的特点，详细推导了停一走近似失效时FMCW SAR的信号模型及处理过程，提出了一种改进的RD算法。此方法是通过补偿连续运动引入的多普勒频移，消除连续运动的影响。展开更多
The paper presents a high-resolution automobile Frequency Modulation Continuous Wave Synthetic Aperture Radar(FMCW SAR) named MiniSAR and the procedure of its signal processing.The imaging geometry of automobile SAR i...The paper presents a high-resolution automobile Frequency Modulation Continuous Wave Synthetic Aperture Radar(FMCW SAR) named MiniSAR and the procedure of its signal processing.The imaging geometry of automobile SAR is very different from that of airborne SAR,leading to a different data processing method for automobile SAR.Therefore,in the paper,we propose an image formation approach that can well handle the focusing issues of automobile SAR.The effects of the strong reflected signal and the spatial-variant synthetic aperture length are analyzed.The processed results with automobile FMCW SAR read data validate the presented method.展开更多
文摘The frequency-modulated continuous-wave （FMCW） synthetic aperture radar （SAR） is a light-weight, cost-effective, high-resolution imaging radar, which is suitable for a small flight platform. The signal model is derived for FMCW SAR used in unmanned aerial vehicles （UAV） reconnaissance and remote sensing. An appropriate algorithm is proposed. The algorithm performs the range cell migration correction （RCMC） for continuous nonchirped raw data using the energy invariance of the scaling of a signal in the scale domain. The azimuth processing is based on step transform without geometric resampling operation. The complete derivation of the algorithm is presented. The algorithm performance is shown by simulation results.
文摘FMCWSAR将调频连续波与合成孔径成像技术结合于一体，是一种新近被提出来的成像雷达体制，它以其体积小、重量轻、成本低、分辨率高等一系列优点，引起越来越多的关注。然而，在FMCWSAR系统中，雷达连续不断地发射信号，调制信号周期相对较长，停一走（STOP AND GO）近似不再成立，所以要用合适的算法来实现成像。针对FMCW SAR的特点，详细推导了停一走近似失效时FMCW SAR的信号模型及处理过程，提出了一种改进的RD算法。此方法是通过补偿连续运动引入的多普勒频移，消除连续运动的影响。
基金Supported jointly by the Hundred Talents Program of the Chinese Academy of Sciences and General Program of National Natural Science Foundation of China(No.6117212)
文摘The paper presents a high-resolution automobile Frequency Modulation Continuous Wave Synthetic Aperture Radar(FMCW SAR) named MiniSAR and the procedure of its signal processing.The imaging geometry of automobile SAR is very different from that of airborne SAR,leading to a different data processing method for automobile SAR.Therefore,in the paper,we propose an image formation approach that can well handle the focusing issues of automobile SAR.The effects of the strong reflected signal and the spatial-variant synthetic aperture length are analyzed.The processed results with automobile FMCW SAR read data validate the presented method.
