为了实现高分辨率成像，在保证系统实时性的同时还要保证中心频率估计的精度。
To implement imaging with high resolution, real-time and precision of Doppler centroid estimation at the same time must be ensured.
在无参考点海洋sar定位方法中，多普勒中心频率估计对定位精度有着重要的影响。
Estimation of Doppler central frequency has an important effect to accuracy of fixed position in the fixing approach with no reference points for ocean SAR.
该文从理论和仿真两个角度研究了信噪比对多普勒中心频率估计的影响，给出了多普勒中心频率和信噪比的理论及仿真关系曲线。
The effect of Signal-Noise-Ration (SNR) to the estimation of Doppler central frequency has been studied using theoretical method and simulation technique, and results are given in curves.
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