Method to get keplerian data

Satellite Keplerian data is continuously update when Epoch is established. A new method to colect actualized informations is needed.
Minimal information:
 typedef struct tagKeplerianData
{
 long int SatNum;
 char Classification;
 std::string IntDesign;
 gTime MessurementDate; // Keplerian data Messurement Date
 double ndot; //Ballistic Coefficient
 double nddot; //Ballistic Coefficient Derivative
 double bstar; //BSTAR drag
 int EphemType;
 long ElsetNum;
 double Inclination; //Radians
 double RAAN; //Radians
 double Eccentricity;
 double ArgPerigee; //Radians
 double MeanAnomaly; //Radians
 double MeanMotion; //Radians per minute
 long OrbitNum;
 std::string SatName; // Satellite Name

}KeplerianData_t;