先给定初始常数值后，通过迭代计算偏心异常、计算升序节点和格林威治子午线之间的角度来计算卫星的位置，并给出计算卫星速度的方法。(After the initial constant is given, the position of the satellite is calculated by iterating the eccentricity anomaly, calculating the angle between ascending node and Greenwich meridian, and the method of calculating satellite velocity is given.)