星载相控阵热变形误差估计与校正方法

Array thermal deformation error calibration method for spaceborne radar

为提高星载相控阵天线热变形误差估计精度,提出一种结合机械测量和信号处理的误差估计方法。该方法利用测量传感器的测量数据,能够快速地拟合得到形变阶数和阵元初始位置;根据星-地几何关系,提取已知来波角度的模糊地块回波作为校正源数据,进而结合形变特性建立优化模型,在迭代中计算得到更加精确的阵元位置估计值。仿真结果表明,该方法能够获得优于1/15波长的热变形误差估计结果,并且在较大变形误差的情况下仍具有良好的稳健性,最终获得了良好的方向图校正结果。

In order to improve the accuracy of the thermal deformation error estimation for spaceborne phased arrays, an array error estimation method is proposed which combines the measurement and the signal processing. In the proposed method, the deformation order and initial positions are obtained from the measurement. Then the echo data can be obtained from the range-Doppler images. The optimization model is established based on the deformation characteristics. The sensor positions can be corrected with high accuracy in the iteration. Several simulated results show that the proposed method can obtain estimation better than one-fifteenth the wavelength and is still robust under the large deformation error condition. The array pattern is compensated well in the simulation.