It is efficient to compute long-period and secular perturbations by numerical integration, but the classical analytic solution may be used to calculate the short-period perturbations.

用数值积分来计算长周期和长期摄动，而用经典分析解的表达式来计算短周期摄动，这是很有效的。

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The mechanism of Low earth orbit(LEO) satellite formation secular evolvement under the influence of gravitational perturbations is studied.

研究近地轨道卫星编队构形在引力摄动作用下的长期演化机理。

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