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!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! SDDL Name:	WIEPHEMERIS.SDDL
!
! Purpose:      This SDDL file defines the wiephemeris relation.
!
! Modification History:
!
!   Date       OPR      Who                       Reason
! --------   -------    ---   -------------------------------------------------
! 11/15/94    27329     SSS   Original implementation
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!

LANGUAGE	FORTRAN, SQL

RECORD  WIEPHM_TYPE

    DESCRIPTION       "This relation contains the geocentric HST orbital 
                       parameters used by the flight software to compute the 
                       HST state vector.  The data in this relation is indexed 
                       by the time which is given in the number of seconds 
                       past 1/1/85 (NOT 1980).  The data is loaded into the
                       relation by the WEREADX program using the HST 
                       definitive ephemeris files provided by PASS."


    FIELD  epoch_time
        TYPE            R8
        UNITS           "SECONDS"
        DESCRIPTION     "This is the epoch time of the orbital parameters in
                         the form of the number of seconds since 1/1/85."
    END_FIELD


    FIELD  sd_mean_anom
        TYPE            R8
        UNITS           "REVOLUTIONS/SECOND"
        DESCRIPTION     "This is the second derivative coefficient for the
                         orbital mean anomaly." 
    END_FIELD


    FIELD  cir_vel
        TYPE            R8
        UNITS           "METERS/SECOND"
        DESCRIPTION     "This is the circular orbit linear velocity."
    END_FIELD


    FIELD  cos_orb_incl
        TYPE            R8
        DESCRIPTION     "This is the cosine of the orbital inclination."
    END_FIELD


    FIELD  eccentricity
        TYPE            R8
        DESCRIPTION     "This is the eccentricity of the orbit."
    END_FIELD


    FIELD  two_x_ecc
        TYPE            R8
        DESCRIPTION     "This is 2 times the eccentricity of the orbit."
    END_FIELD


    FIELD  ecc_cbd_x_ft
        TYPE            R8
        DESCRIPTION     "This is the eccentricity of the orbit cubed times 
                         4/3."
    END_FIELD


    FIELD  ecc_sqd_x_fh
        TYPE            R8
        DESCRIPTION     "This is the eccentricity of the orbit squared times 
                         5/2."
    END_FIELD


    FIELD  ecc_cbd_x_t
        TYPE            R8
        DESCRIPTION     "This is the eccentricity of the orbit cubed times 3."
    END_FIELD


    FIELD  fd_mean_anom
        TYPE            R8
        UNITS           "REVOLUTIONS/SECOND"
        DESCRIPTION     "This is the first derivative coefficient for mean 
                         anomaly."
    END_FIELD


    FIELD  rt_node_rad
        TYPE            R8
        UNITS           "RADIANS/SECOND"
        DESCRIPTION     "This is the rate of change of the right ascension of
                        ascending node."
    END_FIELD


    FIELD  rt_node_rev
        TYPE            R8
        UNITS           "REVOLUTIONS/SECOND"
        DESCRIPTION     "This is the rate of change of the right ascension of
                        ascending node in revolutions per second."
    END_FIELD


    FIELD  arg_perigee
        TYPE            R8
        UNITS           "REVOLUTIONS"
        DESCRIPTION     "This is the argument of perigee."
    END_FIELD


    FIELD  mean_anomaly
        TYPE            R8
        UNITS           "REVOLUTIONS"
        DESCRIPTION     "This is the mean anomaly."
    END_FIELD


    FIELD  rt_chng_peri
        TYPE            R8
        UNITS           "REVOLUTIONS/SECOND"
        DESCRIPTION     "This is the rate of change of the argument of 
                         perigee."
    END_FIELD


    FIELD  rt_asc_node
        TYPE            R8
        UNITS           "REVOLUTIONS"
        DESCRIPTION     "This is the right ascension of the ascending node."
    END_FIELD


    FIELD  sin_orb_incl
        TYPE            R8
        DESCRIPTION     "This is the sine of the orbital inclination."
    END_FIELD


    FIELD  semilat_rect
        TYPE            R8
        UNITS           "METERS"
        DESCRIPTION     "This is the semi-latus rectum of the orbit."
    END_FIELD


    FIELD  time_effect
        TYPE            R8
        UNITS           "SECONDS"
        DESCRIPTION     "This is the time the parameters took effect onboard
                         the spacecraft in seconds since 1/1/85."
    END_FIELD


    FIELD  sdma3sq
        TYPE            R8
        UNITS           "RADIANS/SECOND"
        DESCRIPTION     "This is 3 times the second derivative of the mean 
                         anomaly squared."
    END_FIELD


    FIELD  hsthorb
        UNITS           "SECONDS"
        TYPE            R8
        DESCRIPTION     "This is 1/2 of the orbital period."
    END_FIELD

END_RECORD


RELATION  wiephemeris
    TYPE             WIEPHM_TYPE
    DESCRIPTION      "HST Orbital Parameters Relation"
    SUBSYSTEM_USING  "SPSS, PODPS"
    INDEX  wiephemeris_1
        TYPE         unique, clustered
        FIELDS       epoch_time, time_effect
        ATTRIBUTES   ignore_dup_key
    END_INDEX
END_RELATION


INSTANCE  wiephemeris
    GLOBAL
    TYPE        WIEPHM_TYPE
END_INSTANCE

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