二阶运动补偿对低频超宽带SAR视线误差补偿的影响

李建阳; 常文革; 黎向阳

doi:10.3724/SP.J.1146.2010.00812

二阶运动补偿对低频超宽带SAR视线误差补偿的影响

doi: 10.3724/SP.J.1146.2010.00812

李建阳^{* 常文革黎向阳,},
常文革,
黎向阳

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出版历程
- 收稿日期: 2010-08-05
- 修回日期: 2011-01-25
- 刊出日期: 2011-04-19

Second-order Motion Compensation Effects on Light of Sight Error Compensation in Low-frequency Ultra Wide-band SAR

Li Jian-Yang^{* 常文革黎向阳
,},
Chang Wen-Ge,
Li Xiang-Yang

摘要

摘要: 视线误差补偿是低频超宽带合成孔径雷达(UWB SAR)成像处理的关键，该文主要研究基于测量数据的距离空变视线误差补偿，即二阶补偿。标准的二阶补偿在推导的过程中，对回波进行了一定的近似，认为距离空变视线误差对回波距离迁徙校正(RCMC)没有影响，而这个近似条件，在低频超宽带SAR中是不满足的。针对这个问题，该文对二阶补偿在低频超宽带SAR中的应用进行了分析，研究了3种二阶补偿方法，即：二阶补偿位于RCMC之后完成；二阶补偿位于RCMC之前完成；沿距离向划分子带进行二阶补偿。文中对3种二阶补偿方法进行了对比分析，并对每种补偿方法中存在的误差进行了分析。最后采用仿真以及实测低频超宽带SAR数据验证了文中分析的正确性。
- 低频超宽带SAR /
- 距离空变 /
- 二阶运动补偿 /
- 距离迁徙校正
Abstract: The MOtion COmpensation (MOCO) of Light Of Sight (LOS) error is very important in low-frequency Ultra Wide-Band Synthetic Aperture Radar (UWB SAR). In this paper, the second-order MOCO is studied which compensate the range-variant component of LOS error. In second-order MOCO, the assumption that there is no effect of range-variant LOS error on the Range Cell Migration Correction (RCMC) is supposed, which is not satisfied in UWB SAR. This paper analyzes the application of the second-order MOCO in low-frequency UWB SAR. Three methods which can be applied to compensate the range-variant LOS error are presented. First method implements the second-order MOCO after RCMC, second method implements it before RCMC, and the last method implements it in sub-band which is split along range direction. The three methods are compared and analyzed in this paper. Finally, the effectiveness of theoretical analysis is validated with simulation and real low-frequency UWB SAR data.
- Low-frequency ultra wide-band SAR /
- Range-variant /
- Second-order motion compensation /
- Range Cell Migration Dorrection (RCMC)

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