本文通过详细的数学推演，厘清了水平方位角与俯仰角测量耦合的关系。
This article clears the measuring coupling relationship between horizontal azimuth and pitch angles by detailed mathematical deduction.
用UD分解改进EKF粒子滤波算法，并将其应用于基于星光仰角测量的探测器自主导航方案。
Using UD decomposing to modify EKF Particle filter was imported into the navigation scheme based on the measurement of elevation Angle of star.
梯度使气流方向测量值向负梯度方向偏转。 圆柱探针和锥形多孔探针相比，气流方向测量误差对速度梯度更敏感，纵向梯度对俯仰角测量值的影响尤其大。
The velocity gradient, especially the perpendicular velocity gradient, leads the measuring error of flow angle with cylindrical probe to be larger than with conical multi-hole probe.
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