extern "C"
{
	__declspec(dllexport)  double DTO_Comput(double* target_llh, double* rec_llh1, double* rec_llh2, double* main_sat_pos, double* neigh_sat_pos);
	__declspec(dllexport)   double DFO_Comput(double* target_llh, double* rec_llh1, double* rec_llh2, double* main_sat, double* neigh_sat, double fu, double fd);
	__declspec(dllexport)  double CFO_Comput(double* target_llh, double* main_sat, double fu);