一类由星下点反算卫星近圆回归轨道的方法

提出了一类近圆回归轨道的设计方法,解决当飞行任务对星下点有要求时,近圆回归轨道的设计问题。分析了星下点轨迹与轨道参数的关系,概括为当对星下点轨迹有要求时,近圆回归轨道的设计依赖于轨道半径和轨道倾角两个参数的确定。以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组,但直接求解过于复杂,采取迭代的方法解决。编制了MATLAB程序进行设计计算,并将计算结果用软件STK(Satellite Tool Kit)进行仿真。仿真结果显示,该算法能够较好的实现设计目标。

Calculation Method of a Kind of Near-round Repeating Satellite Orbit Using Nadir Points

A method of nearly-round repeating orbit designing is proposed.It's aimed to resolve the question of orbit designing with the restriction of a specific satellite ground trace.The(relationship) between the satellite ground trace and orbit parameters is analyzed.It's concluded that the designing of the nearly-round repeating orbit with the restriction of a specific satellite ground trace relies on the determination of the semi-axis and the inclination.Non-linear equations are(constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination,but it's too complicated to be resolved directly.Therefore,an iteration algorithm is used to resolve it.A MATLAB program is built to realize the algorithm.The result is simulated by STK(Satellite Tool Kit).It shows,this algorithm works well in obtaining the designing target.