For the purpose of phase center estimation by taking into account the deformation of wing conformal antenna ar-ray ,a new approach which performed in three stages is proposed .The first stage is carried out at range-Doppler images to estimate the primary eigen-vector associated with a given range-Doppler bin by adopting subspace tracking algorithm .Secondly ,the initial es-timation of phase center is obtained by fitting the unwrap phase of primary eigen-vector with least square algorithm .Finally ,we cal-culate the deformation parameters based on these initial estimation with total least square algorithm ,and the fine estimation of phase center is achieved .The most advantage of the proposed methodology is that none of the auxiliary calibration sources are needed .The effectiveness is confirmed by performance analysis and extensive simulation .%研究机翼共形阵列存在共形表面变形下的阵元位置估计问题。在获取观察区域距离-多普勒图像基础上，首先采用子空间跟踪方法估计给定距离-多普勒单元数据的主特征矢量；然后利用最小二乘方法拟合不同多普勒通道主特征矢量的绝对相位特性来获得相位中心的初估计；最后结合机翼共形表面的变形模型，在采用整体最小二乘方法拟合形变参数基础上得到相位中心的最终估计结果。仿真结果表明该算法不需要辅助校正源，能获得优于十分之一波长的相位中心位置估计精度，满足高分辨率空间谱估计要求。
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