通过对时间梯度误差的分析，得到了新的梯度约束方程；
A novel gradient constraint equation was obtained through analyzing the error of temporal gradient.
在建立回波抵消器模型的基础上，按最小均方误差准则，导出了自适应滤波器抽头的统计梯度算法和抽头调节的收敛公式。
Based on building up a model of echo canceller, the convergence of gradient-type stochastic adjustment algorithm of an adaptive filter under the mean-squared error criterion is discussed.
最后，反求轨道误差和位系数误差对重力梯度测量值的影响。
Finally, the influence of orbital errors and potential coefficient errors on the gravity gradient measurements are conversely found out.
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