In two-stage estimate, used orthogonal transformation to estimate aggregate average and fitting constants method to estimate variance which was unbiased.
在两步估计法中，利用正交变换得到了总平均的估计，然后采用拟合常数法得到了方差的估计，并证明了该估计是无偏估计。
When three baselines are used, during the maneuver of the vehicle, the baselines that are nearly orthogonal can estimate the attitude better than other frames of baselines.
当使用三基线的天线阵时，在飞行机动较大的情况下采用近似正交布局的天线结构可以更好地估计姿态。
Orthogonal polynomial approximation is proposed to estimate the nonlinear deterministic trend and then the residual is used to test the unit root.
本文研究用正交多项式逼近非线性趋势，然后对残差进行单位根检验的方法。
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