4Hoots F R, Roehrieh R L. Models for propagation of NORAD element sets[ M]. AEROSPACE DEFENSE COMMAND PETERSON AFB CO OFFICE OF ASTRODYNAMICS, 1980.
5Li C, Luo F J, Zhang W Y. A study on satellite-ground link of the sat- ellite receiving station J]. Advanced Materials Research, 2012,487 : 143 - 147.