常見例句雙語例句Second is the orbit constraint, that is, the needs of searching the nature periodic relative motion orbits.二是軌道約束，即尋找自然環(huán)境下周期性相對繞飛構(gòu)形的約束。The analytic expressions of the periodic relative motion condition considering nonlinearity and eccentricity are conveniently derived by the presented method.利用這種新方法：給出了非線性和橢圓參考軌道等條件下編隊衛(wèi)星周期性相對運動條件的解析表達式；By using the classical orbit element differences method, the periodic characteristics of relative motion and the influence of atmospheric drag on relative motion were analyzed.基于經(jīng)典軌道要素偏差法分析了相對運動特性和大氣阻力對相對運動的影響。 返回 periodic relative motion