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setthd.f
Go to the documentation of this file.
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SUBROUTINE
setthd
(X,Y)
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C VERSION OF 1/27/85
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C PURPOSE
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C COMPUTES ROTATION MATRIX FOR CONVERSION FROM ORBITAL
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C ELEMENTS TO CARTESIAN COORDINATES
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C INPUT
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C X = 7-D ORBITAL ELEMENT SET OF THIRD BODY
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C (1) = SEMI-MAJOR AXIS (KM)
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C (2) = ECCENTRICITY
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C (3) = INCLINATION (RAD)
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C (4) = LONGGITUDE OF ASCENDING NODE (RAD)
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C (5) = ARGUMENT OF PERIAPSIS (RAD)
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C (6) = MEAN ANOMALY OF THE THIRD BODY AT TR (RAD)
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C (7) = MEAN MOTION (RAD/SEC)
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C Y = 7-D ELEMENTS TO TRANFORM ORBITAL ELEMENTS TO CART.
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C COORD
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C (1) = L1, COS(NODE)*COS(W) - SIN(NODE)*SIN(W)*COS(I)
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C (2) = M1, SIN(NODE)*COS(W) + COS(NODE)*SIN(W)*COS(I)
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C (3) = N1, SIN(W)*SIN(I)
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C (4) = L2, -COS(NODE)*SIN(W) - SIN(NODE)*COS(W)*COS(I)
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C (5) = M2, -SIN(NODE)*SIN(W) + COS(NODE)*COS(W)*COS(I)
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C (6) = N2, COS(W)*SIN(I)
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C (7) = SEMI-MINOR AXIS, A*SQRT(1-E*E)
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C REFENENCES
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C JPL EM 312/87-153, 20 APRIL 1987
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C ORBITAL MOTION, A. E. ROY, 1978, P.102
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C ANALYSIS
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C J. H. KWOK - JPL
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C PROGRAMMER
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C J. H. KWOK - JPL
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C PROGRAM MODIFICATION
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C NONE
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C COMMENTS
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C NONE
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C
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IMPLICIT DOUBLE PRECISION
(a-h,o-z)
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dimension x(7),y(7)
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ci=dcos(x(3))
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si=dsin(x(3))
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cc=dcos(x(4))
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sc=dsin(x(4))
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cw=dcos(x(5))
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sw=dsin(x(5))
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y(1)=cc*cw-sc*sw*ci
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y(2)=sc*cw+cc*sw*ci
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y(3)=sw*si
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y(4)=-cc*sw-sc*cw*ci
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y(5)=-sc*sw+cc*cw*ci
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y(6)=cw*si
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y(7)=dsqrt(1.d0-x(2)**2)*x(1)
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RETURN
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END
setthd
subroutine setthd(X, Y)
Definition:
setthd.f:2
