The paper expounds the principle and the method of measuring zenith distance for celestial positioning based on the direction of gravitational force line.
论述了在海上进行天文定位时以重力线作基准直接测定天体顶距的原理和方法。
By using geometry analysis method, this paper educed calculation formula of normal direction gear side clearance when internal gearing involute gear transmission center distance waned slightly.
通过几何分析的方法，导出了内啮合渐开线齿轮传动中心距略变小时，法向齿侧间隙的计算公式，供齿轮传动设计计算之用。
The method used in the literature greatly limit the distance between the microphone-array, and the precision of direction finding is related to the distance of the microphone-array.
麦克风间距的限制是互功率谱加权声源测向方法最大的问题，声源测向精度、角度分辨率与麦克风间距成反比。
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