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Luminary099/CONIC_SUBROUTINES.agc
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@ -175,11 +175,13 @@
# MOD NO. - 0 LOG SECTION - CONIC SUBROUTINES
# MOD BY KRAUSE ASSEMBLY - COLOSSUS REVISION 88
#
#
# FUNCTIONAL DESCRIPTION -
#
# THIS SUBROUTINE CALCULATES THE INITIAL VELOCITY REQUIRED TO TRANSFER A POINT-MASS ALONG A CONIC TRAJECTORY
# FROM AN INITIAL POSITION TO A TERMINAL POSITION IN A PRESCRIBED TIME INTERVAL. THE RESULTING TRAJECTORY MAY BE
# A SECTION OF A CIRCLE, ELLIPSE, PARABOLA, OR HYPERBOLA WITH RESPECT TO TEH EARTH OR THE MOON. THE USE OF THE
# SUBROUTINE CAN BE EXTEDED USING OTHER PRIMARY BODIES BY SIMPLE ADDITIONS TO THE MUTABLE WITHOUT INTRODUCING ANY
# A SECTION OF A CIRCLE, ELLIPSE, PARABOLA, OR HYPERBOLA WITH RESPECT TO THE EARTH OR THE MOON. THE USE OF THE
# SUBROUTINE CAN BE EXTENDED USING OTHER PRIMARY BODIES BY SIMPLE ADDITIONS TO THE MUTABLE WITHOUT INTRODUCING ANY
# CODING CHANGES, ACCEPTING THE INHERENT SCALE FACTOR CHANGES IN POSITION AND VELOCITY. AN ITERATION TECHNIQUE IS
# UTILIZED IN THE COMPUTATION.
#
@ -187,33 +189,34 @@
# 1. RECTILINEAR TRAJECTORIES CANNOT BE COMPUTED.
# 2. AN ACCURACY DEGRADATION OCCURS AS THE COSINE OF THE TRUE ANOMALY DIFFERENCE APPROACHES +1.0.
# 3. THE ANGLE BETWEEN ANY POSITION VECTOR AND ITS VELOCITY VECTOR MUST BE GREATER THAN 1 DEGREE 47.5 MINUTES
# AND LESS THAN 178 DEGREES 12.5 MINUTES.
# AND LESS THAN 178 DEGREES 12.5 MINUTES.
# 4. NEGATIVE TRANSFER TIME IS AMBIGUOUS AND WILL RESULT IN NO SOLUTION.
# 5. THE PARAMETERS IN THE PROBLEM MUST NOT EXCEED THEIR SCALING LIMITS SPECIFIED IN THE GSOP. IF THE
# LIMITS ARE EXCEEDED, THE RESULTING SOLUTION WILL BE MEANINGLESS.
#
# LIMITS ARE EXCEEDED, THE RESULTING SOLUTION WILL BE MEANINGLESS.
# THE NUMBER OF ITERATIONS AND, THEREFORE, THE COMPUTATIONS SPEED IS DEPENDENT ON THE ACCURACY OF THE FIRST
# GUESS OF THE INDEPENDENT VARIABLE, COGA. THE AGC COMPUTATION TIME IS APPROXIMATELY
# .105 SECONDS FOR INITIALIZATION, .069 SECONDS FOR FINAL COMPUTATIONS, PLUS .205 SECONDS FOR EACH ITERATION.
# GUESS OF THE INDEPENDENT VARIABLE, COGA. THE AGC COMPUTATION TIME IS APPROXIMATE-
# LY .105 SECONDS FOR INITIALIZATION, .069 SECONDS FOR FINAL COMPUTATIONS, PLUS .205 SECONDS FOR EACH ITERATION.
#
#
# REFERENCES -
# R-479, MISSION PROGRAMMING DEFINITION MEMO NO. 10, LUNAR LANDING MISSION GSOP - SECTION 5.5, SGA MEMO 67-8,
# SGA MEMO 67-4.
# R-479, MISSION PROGRAMMING DEFINITION MEMO NO. 10, LUNAR LANDING MISSION GSOP-SECTION 5.5, SGA MEMO 67-8,
# SGA MEMO 67-4.
#
#
# INPUT - ERASABLE INITIALIZATION REQUIRED
#
# * SCALE FACTOR *
# VARIABLE *IN POWERS OF 2 * DESCRIPTION AND REMARKS
# -------- *-------------- * -----------------------
# R1VEC * +29 FOR EARTH * DP INITIAL POSITION VECTOR IN METERS
# * +27 FOR MOON *
# R2VEC * +29 FOR EARTH * DP TARGET OR TERMINAL POSITION VECTOR IN METERS
# * +27 FOR MOON *
# TDESIRED * +28 * DP DESIRED TRANSFER TIME IN CENTISECONDS
# X1 (38D) * NONE * INDEX REGISTER SET TO -2D OR -10D ACCORDING TO WHETHER THE EARTH OR MOON,
# * * RESPECTIVELY, IS THE CENTRAL BODY
# GEOMSGN * NONE * SP +.5 IF DESIRED TRANSFER ANGLE IS LESS THAN 180 DEGREES, -.5 IF GREATER THAN 180 DEG.
# GUESSW * NONE * AN INTERPRETER SWITCH TO BE SET IF NO GUESS OF COGA IS AVAILABLE, CLEAR IF A GUESS OF
# * SCALE FACTOR *
# VARIABLE *IN POWERS OF 2* DESCRIPTION AND REMARKS
# -------- *--------------* -----------------------
# R1VEC * +29 FOR EARTH* DP INITIAL POSITION VECTOR IN METERS
# * +27 FOR MOON *
# R2VEC * +29 FOR EARTH* DP TARGET OR TERMINAL POSITION VECTOR IN METERS
# * +27 FOR MOON *
# TDESIRED * +28 * DP DESIRED TRANSFER TIME IN CENTISECONDS
# X1 (38D) * NONE * INDEX REGISTER SET TO -2D OR -10D ACCORDING TO WHETHER THE EARTH OR MOON,
# * * RESPECTIVELY, IS THE CENTRAL BODY
# GEOMSGN * NONE * SP +.5 IF DESIRED TRANSFER ANGLE IS LESS THAN 180 DEGREES, -.5 IF GREATER THAN 180 DEG.
# GUESSW * NONE * AN INTERPRETER SWITCH TO BE SET IF NO GUESS OF COGA IS AVAILABLE, CLEAR IF A GUESS OF
# Page 1164
# * * COGA IS TO BE USED BY LAMBERT
# COGA * +5 * DP GUESS OF COTANGENT OF FLIGHT PATH ANGLE (MEASURED FROM VERTICAL). THIS WILL BE