计算特定卫星轨道选择合适的力学模型，评估卫星上各种摄动力-Calculate specific satellite orbital mechanics to choose the right model, the assessment of a variety of satellite perturbation

ECI与ECEF转换关系，卫星轨道模型方法，应用相关(ECI and ECEF conversion relation, satellite orbit model method, application correlation)

考虑地球扁率摄动，求解近地卫星轨道六根数，(Consider J2 perturbation to solve the number of six tracks)