118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
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#ifndef _sgp4unit_
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#define _sgp4unit_
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/* ----------------------------------------------------------------
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*
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* sgp4unit.h
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*
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* this file contains the sgp4 procedures for analytical propagation
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* of a satellite. the code was originally released in the 1980 and 1986
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* spacetrack papers. a detailed discussion of the theory and history
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* may be found in the 2006 aiaa paper by vallado, crawford, hujsak,
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* and kelso.
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*
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* companion code for
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* fundamentals of astrodynamics and applications
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* 2007
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* by david vallado
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*
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* (w) 719-573-2600, email dvallado@agi.com
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*
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* current :
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* 20 apr 07 david vallado
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* misc fixes for constants
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* changes :
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* 11 aug 06 david vallado
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* chg lyddane choice back to strn3, constants, misc doc
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* 15 dec 05 david vallado
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* misc fixes
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* 26 jul 05 david vallado
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* fixes for paper
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* note that each fix is preceded by a
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* comment with "sgp4fix" and an explanation of
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* what was changed
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* 10 aug 04 david vallado
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* 2nd printing baseline working
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* 14 may 01 david vallado
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* 2nd edition baseline
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* 80 norad
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* original baseline
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* ---------------------------------------------------------------- */
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#include <math.h>
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#include <stdio.h>
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// -------------------------- structure declarations ----------------------------
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typedef enum
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{
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wgs72old,
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wgs72,
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wgs84
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} gravconsttype;
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typedef struct elsetrec
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{
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long int satnum;
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int epochyr, epochtynumrev;
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int error;
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char init, method;
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/* Near Earth */
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int isimp;
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double aycof , con41 , cc1 , cc4 , cc5 , d2 , d3 , d4 ,
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delmo , eta , argpdot, omgcof , sinmao , t , t2cof, t3cof ,
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t4cof , t5cof , x1mth2 , x7thm1 , mdot , nodedot, xlcof , xmcof ,
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nodecf;
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/* Deep Space */
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int irez;
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double d2201 , d2211 , d3210 , d3222 , d4410 , d4422 , d5220 , d5232 ,
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d5421 , d5433 , dedt , del1 , del2 , del3 , didt , dmdt ,
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dnodt , domdt , e3 , ee2 , peo , pgho , pho , pinco ,
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plo , se2 , se3 , sgh2 , sgh3 , sgh4 , sh2 , sh3 ,
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si2 , si3 , sl2 , sl3 , sl4 , gsto , xfact , xgh2 ,
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xgh3 , xgh4 , xh2 , xh3 , xi2 , xi3 , xl2 , xl3 ,
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xl4 , xlamo , zmol , zmos , atime , xli , xni;
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double a , altp , alta , epochdays, jdsatepoch , nddot , ndot ,
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bstar , rcse , inclo , nodeo , ecco , argpo , mo ,
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no;
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} elsetrec;
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// --------------------------- function declarations ----------------------------
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int sgp4init
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(
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gravconsttype whichconst, const int satn, const double epoch,
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const double xbstar, const double xecco, const double xargpo,
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const double xinclo, const double xmo, const double xno,
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const double xnodeo,
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elsetrec& satrec
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);
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int sgp4
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(
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gravconsttype whichconst,
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elsetrec& satrec, double tsince,
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double r[], double v[]
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);
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double gstime
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(
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double
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);
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void getgravconst
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(
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gravconsttype,
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double&,
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double&,
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double&,
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double&,
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double&,
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double&,
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double&,
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double&
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);
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#endif
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