将ECI的位置、速度、加速度转换成ECEF的位置、速度、加速度。
ECEF,earth centered eath fixed
该坐标系以地球质心为原点,Z轴向北沿地球自转轴方向,X轴指向经纬度的(0,0)位置,右手系Y轴指向90度经线。该系与地球一同转动。
ECI,earth centered inertial
坐标原点取在地心,X轴指向春分点,Z轴指向北极,Y轴与前者构成右手系。该系不与地球一同转动,因此可以应用牛顿定律。
Convert ECI to ECEF Coordinates
Convert ECI (CIS, Epoch J2000.0) Coordinates to WGS 84 (CTS, ECEF) Coordinates. This function has been vectorized for speed.
Example Function Call:
>> [r_ECEF v_ECEF a_ECEF] = ECItoECEF(JD,r_ECI,v_ECI,a_ECI);
Where:
JD is the Julian Date vector [1 x N] (units are in days)
r_ECI is the position vector [3 x N] (any units are permitted)
v_ECI is the velocity vector [3 x N] (any units are permitted)
a_ECI is the acceleration vector [3 x N] (any units are permitted)
ECItoECEF.m JD2GAST.m JD2GMST.m