This Xcos block allows for propagation of Keplerian orbital elements from epoch time to the current time including the secular J2 effects only.
Block allows for propagation of Keplerian orbital elements from epoch time to the current time including the secular J2 effects only. The secular effects of J2 consist in drifts on periapsis argument, right ascension of ascending node and mean anomaly. See CL_op_driftJ2 for more details. Iniitial keplerian elements, epoch time and current time should be provided via block inputs. Event input activates propagation. Classical Keplerian arguments (in order used in block input) are:
sma : semi-major axis [m]
ecc : eccentricity
inc : inclination [rad]
pom : periapsis argument [rad]
raan : right ascension of ascending node [rad]
anm : mean anomaly [m]
Input 1: 6x1 double (initial keplerian elements)
Input 2: 1x1 double (epoch time in modified julian day since 1950 format)
Input 2: 1x1 double (current time in modified julian day since 1950 format)
Output: 6x1 double (propagated keplerian elemnts)
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macros/SECULAR_J2.sci
macros/AB_ex_secularJ2.sci