sc_gravity_earth.h

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//-----------------------------------------------------------------------------------------
//     Earth orbit gravity model.
//-----------------------------------------------------------------------------------------
//     Copyright (c) 2011 Princeton Satellite Systems.  All rights reserved.
//-----------------------------------------------------------------------------------------
#ifndef __GRAVITY_EARTH__
#define __GRAVITY_EARTH__
 
#ifdef AS_OS_WINDOWS
        #include "matrixlib.h"
#else
        #include <MatrixLib/MatrixLib.h>
#endif
 
 
class gravity_earth
{
                
        private:
        int harmonics;
        
        void initialize_from_file( char * filename );
        double factorial( int k );
        ml_matrix   harmonic_accel( const ml_matrix& rG );      
    
        ml_matrix c;
        ml_matrix s;
    
        int nM;
        int nN;
    
        int nMUse;
        int nNUse;
    
        double mu;
        double a;
    
        int use_moon;
        int use_sun;
    
        ml_matrix aP;
        ml_matrix aZ;
        ml_matrix aT;
 
 
        public:
                                        gravity_earth( void );
    
                void            initialize( char * filename );
        void            initialize( void );
    
                ml_matrix       compute_accel( const ml_matrix& r_eci, double julian_date );
        ml_matrix       compute_accel_ef( const ml_matrix& r_ef, double julian_date );
  
        void        set_order( int n ){nMUse = n;};
        void        set_degree( int n ){nNUse = n;};
        void        include_moon_accel( void ){use_moon = 1;};
        void        include_sun_accel( void ){use_sun = 1;};
    
    
        ml_matrix     get_point_accel( void ){ return aP;};
        ml_matrix     get_tesseral_accel( void ){ return aT;};
        ml_matrix     get_zonal_accel( void ){ return aZ;};    
 
 
};
 
 
#endif