介绍了捷联惯导系统数字调平基本原理和实现过程，然后讨论了通过数据周期延拓实现快速精调平的方法。
The theory and realizing process of digital levelling for SINS is introduced, then fast accurate levelling method by data cyclic continuation is discussed.
分析系统从滤波出的目标航路中向后找到弹丸击中目标时的目标位置，向后周期数为原火控系统解算出的弹飞时间除以数据周期的商。
The analytic method found the hitting target position from filtered target fairway by looking up backwards some cycles whose count was the quotient of pill flying time divided by data cycle.
这些数据已经建立了地球轨道变化和冰期周期之间的强有力的联系。
These data have established a strong connection between variations in the Earth's orbit and the periodicity of the ice ages.
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