The errors of radar rainfall measurement and the complexity of hydrological model have led to lowed accuracy for hydrological prediction.

雷达测雨的误差以及水文模型自身的结构和尺度问题等的复杂性，导致了水文预报的精度不理想。

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Then, a variance analysis method was used to analyze the seeker pointing angle error caused by airborne radar measurement noises, initial sensor errors and initial misalignment.

其次，分别建立了雷达测量误差、初始对准误差和惯性元器件误差与导弹位置、姿态测量误差和目标位置测量误差的关系，并得到了其误差影响的方差表达式；

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