证明了在符号定时精确已知时，时域估计方法和之前提出的频域估计方法的等价性。

Equivalence of the proposed method and the frequency domain estimation method proposed previously is proved.

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在分析几种常用的气象回波谱矩估计算法的基础上，提出了一种改进的频域估计算法。

Then we propose an improved spectral processing algorithm based on comprehensive analysis of several commonly used SM estimators.

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该方法使用了时频同步跟踪环路，从数据子载波提取相位误差，并利用频域插值补偿多个用户的估计频偏。

The system uses time-frequency tracking loops to extract phase errors from data subcarriers with frequency interpolation to compensate for the estimated carrier frequency offsets.

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