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Orbit.h

Go to the documentation of this file.

// $Id: Orbit.h,v 1.6 2002/08/04 00:52:45 srobinsn Exp $


#ifndef ORBIT_H
#define ORBIT_H

#include <utility>        // for STL pairs
#include "geometry/CoordTransform.h"

class Orbit{
    
public:
    Orbit(double asclon = 0., double alt = 600., double inc = 28.5, double phs = 0.,
        double apitch = 0., double ayaw = 0., double aroll = 0.);
    
    double get_phase (double timeInSeconds) const;
    
    std::pair<double,double> coords(double timeInSeconds) const;
    

    virtual double latitude(double timeInSeconds) const;
    


    virtual double longitude(double timeInSeconds) const;
    
    virtual double pitch (double timeInSeconds) const;
    
    virtual double yaw (double timeInSeconds) const;
    
    virtual double roll (double timeInSeconds) const;
    
    virtual double phase (double timeInSeconds) const;
    
    void    inclination ( double inc );
    
    void    ascendingLon ( double asc );
    
    void    startphase ( double phi );
    
    void displayRotation(Rotation rot);
    
    inline double startphase() const;
    inline double period() const;
    inline double inclination() const;
    inline double altitude() const;
    inline double ascendingLon() const;
    
    //transformations for the current position (to the zenith-pointing coordinate system)
    Rotation CELTransform(double timeInSeconds);
    
    
    Rotation Orbit::latLonTransform(double timeInSeconds) const;
    
    double Orbit::testLongitude(double timeInSeconds) const;
    double Orbit::testLatitude(double timeInSeconds) const; 
    
protected:
    // manipulation of the orbital parameters - defaults do nothing, however
    // subclasses may overload depending upon which orbital parameters they 
    // specify
    
    virtual void setLatitude ( double ) {}
    virtual void setLongitude ( double ) {}
    virtual void setPitch ( double ) {}
    virtual void setYaw ( double ) {}
    virtual void setRoll ( double ) {}
    
    
    // computation of pointing characteristics of GLAST - assumed, here, to be zenith-pointing
    void computeAttitudes(double timeInSeconds);
    
    // friends - so that only the boss can manipulate this class
    friend class GPS;
    
private:
    double m_ascendingLon;   // longitude of ascending node (degrees)
    double m_inclination;    // orbit inclination (degrees)
    double m_altitude;       // altitude (km)
    double m_period;         // orbital period (minutes)
    double m_sini;           // sine of inclination angle
    double m_cosi;           // cosine of inclination angle
    double m_startphase;     // starting phase offset of the orbit
    double m_precessPeriod;   // Period of orbital precession
    
    double m_degsPerRad;
    double m_secsperday;
    
    
    //RA, DEC of GLAST X and Y axes:
    double m_rax;
    double m_raz;
    double m_decx;
    double m_decz;
    
};

inline double Orbit::period() const {return m_period;}

inline double Orbit::inclination() const {return m_inclination;}

inline double Orbit::altitude() const {return m_altitude;}

inline double Orbit::ascendingLon() const {return m_ascendingLon;}

inline double Orbit::startphase () const {return m_startphase;}

#endif ORBIT_H

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