Firstly, the velocity of target was educed from the secondarycalibration to correct the collimation error, and the incorporated wind speed was introduced to simplify the model of fire control.
首先，运用二次标定法计算得到目标速度， 用以修正火控瞄准误差， 并引入综合风速来简化火控计算模型；
2
The basic principles and characteristics of secondary vibration calibration method are described.
介绍比较法振动传感器幅相特性测量技术的基本原理和传统实现方法。
3
The vacuum comparison standard apparatus is a secondary vacuum standard which is simple in structure, easy to operate, efficient in calibration and very practical.