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