一种估计ISAR成像转角的新方法
doi: 10.3724/SP.J.1146.2005.00997
A New Method for Estimating the Rotation Angle of ISAR Image
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摘要: ISAR成像中的转角估计是进行正确成像的先决条件。该文从分析目标回波信号入手提出了一种新的转角估计方法，对目标转动时不同距离单元回波数据近似为多分量三次相位信号，通过理论推导，得出每个信号分量的三次相位系数与一次相位系数成正比的结论，其比例系数为目标转动的角速度平方，然后采用最大似然方法估计三次相位信号参数，进而得到总转角。外场实测数据结果验证了该文方法的有效性。
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关键词:
- ISAR成像;转角估计;最大似然
Abstract: The estimation of rotation angle is the precondition for ISAR imaging. In this passage, a new method based on the analysis of the echo signals is proposed. The signals in different range bin are approximated as the multi-component third-order polynomial signals, and the proportion of third-order phase coefficient to first-order phase coefficient is constant just equal to the square of the rotation rate. Then the parameters of the third-order polynomial signal are estimated by the maximum likelihood method. The results of real data show the validity of the method proposed. -
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