电光与控制, 2016, 23 (10): 71, 网络出版: 2016-11-18
FMCW CSAR成像多普勒频移的校正方法
A Method for Doppler Shifting Correction of FMCW CSAR Imaging
大场景高速运动 多普勒频移 补偿校正 FMCW CSAR FMCW CSAR large-scale high-velocity motion Doppler shifting compensation and correction
摘要
调频连续波圆周合成孔径雷达(FMCW CSAR)不满足“一步一停”模式,载机运动引起的多普勒频移对大场景高速运动情况下的成像影响明显。FMCW CSAR与直线SAR不同,运动速度方向的不断改变使得原有的直线SAR补偿函数不再适用。针对此问题,建立了精确接收信号模型,推导了CSAR的多普勒频移,分析了运动半径和速度对多普勒频移的影响并提出了一种新的补偿函数对其进行多普勒频移补偿。仿真证明该函数有效校正了多普勒频移,实现了大场景高速运动下的良好聚焦成像。
Abstract
The go-stop mode is not suitable for Frequency Modulated Continuous Wave Circular Synthetic Aperture Radar(FMCW CSAR), the Doppler shifting caused by motion of the carrier aircraft has a great effect on the quality of imaging under large-scale, high-velocity condition.The compensation functions of linear SAR are not applicable due to the continuous change of the velocity direction.To solve the problem, we established an accurate signal receiving model, deduced the Doppler shifting in FMCW CSAR, analyzed the effect of the motion radius and velocity on Doppler shifting, and proposed a new compensation function to revise the Doppler shifting.Simulation results proved that the function can correct the Doppler shifting effectively.
宋德鹏, 付凯城, 曲毅, 石婷. FMCW CSAR成像多普勒频移的校正方法[J]. 电光与控制, 2016, 23(10): 71. SONG De-peng, FU Kai-cheng, QU Yi, SHI Ting. A Method for Doppler Shifting Correction of FMCW CSAR Imaging[J]. Electronics Optics & Control, 2016, 23(10): 71.