202 lines
4.6 KiB
Plaintext
202 lines
4.6 KiB
Plaintext
# Copyright: Public domain.
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# Filename: S-BAND_ANTENNA_FOR_LM.agc
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# Purpose: Part of the source code for Luminary 1A build 099.
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# It is part of the source code for the Lunar Module's (LM)
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# Apollo Guidance Computer (AGC), for Apollo 11.
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# Assembler: yaYUL
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# Contact: Ron Burkey <info@sandroid.org>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 486-489
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# Mod history: 2009-05-17 RSB Adapted from the corresponding
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# Luminary131 file, using page
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# images from Luminary 1A.
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# 2009-06-07 RSB Corrected a misprint.
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#
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# This source code has been transcribed or otherwise adapted from
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# digitized images of a hardcopy from the MIT Museum. The digitization
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# was performed by Paul Fjeld, and arranged for by Deborah Douglas of
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# the Museum. Many thanks to both. The images (with suitable reduction
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# in storage size and consequent reduction in image quality as well) are
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# available online at www.ibiblio.org/apollo. If for some reason you
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# find that the images are illegible, contact me at info@sandroid.org
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# about getting access to the (much) higher-quality images which Paul
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# actually created.
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#
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# Notations on the hardcopy document read, in part:
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#
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# Assemble revision 001 of AGC program LMY99 by NASA 2021112-61
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# 16:27 JULY 14, 1969
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# Page 486
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# SUBROUTINE NAME: R05 -- S-BAND ANTENNA FOR LM
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#
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# MOD0 BY T. JAMES
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# MOD1 BY P. SHAKIR
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#
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# FUNCTIONAL DESCRIPTION
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#
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# THE S-BAND ANTENNA ROUTINE, R05, COMPUTES AND DISPLAYS THE PITCH AND
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# YAW ANTENNA GIMBAL ANGLES REQUIRED TO POINT THE LM STEERABLE ANTENNA
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# TOWARD THE CENTER OF THE EARTH. THIS ROUTINE IS SELECTED BY THE ASTRO-
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# NAUT VIA DSKY ENTRY DURING COASTING FLIGHT OR WHEN THE LM IS ON THE MOON
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# SURFACE. THE EARTH OR MOON REFERENCE COORDINATE SYSTEM IS USED DEPENDING
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# ON WHETHER THE LM IS ABOUT TO ENTER OR HAS ALREADY ENTERED THE MOON
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# SPHERE OF INFLUENCE, RESPECTIVELY.
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#
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# TO CALL SUBROUTINE, ASTRONAUT KEYS IN V 64 E
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#
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# SUBROUTINES CALLED ---
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# R02BOTH
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# INTPRET
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# LOADTIME
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# LEMCONIC
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# LUNPOS
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# CDUTRIG
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# *SMNB*
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# BANKCALL
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# B50OFF
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# ENDOFJOB
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# BLANKRET
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#
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# RETURNS WITH
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# PITCH ANGLE IN PITCHANG REV. B0
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# YAW ANGLE IN YAWANG REV. B0
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#
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# ERASABLES USED
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# PITCHANG
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# YAWANG
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# RLM
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# VAC AREA
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BANK 41
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SETLOC SBAND
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BANK
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EBANK= WHOCARES
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COUNT* $$/R05
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SBANDANT TC BANKCALL
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# Page 487
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CADR R02BOTH # CHECK IF IMU IS ON AND ALIGNED
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TC INTPRET
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SETPD RTB
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0D
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LOADTIME # PICK UP CURRENT TIME
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STCALL TDEC1 # ADVANCE INTEGRATION TO TIME IN TDEC1
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LEMCONIC # USING CONIC INTEGRATION
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SLOAD BHIZ
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X2 # X2 =0 EARTH SPHERE, X2 =2 MOON SPHERE
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CONV4
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VLOAD
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RATT
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STODL RLM
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TAT
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CONV3 CALL
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LUNPOS # UNIT POSITION VECTOR FROM EARTH TO MOON
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VLOAD VXSC
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VMOON
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REMDIST # MEAN DISTANCE FROM EARTH TO MOON
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VSL1 VAD
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RLM
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GOTO
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CONV5
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CONV4 VLOAD
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RATT # UE = -UNIT(RATT) EARTH SPHERE
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CONV5 SETPD UNIT # UE = -UNIT((REM)(UEM) + RL) MOON SPHERE
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0D # SET PL POINTER TO 0
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VCOMP CALL
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CDUTRIG # COMPUTE SINES AND COSINES OF CDU ANGLES
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MXV VSL1 # TRANSFORM REF. COORDINATE SYSTEM TO
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REFSMMAT # STABLE MEMBER B-1 X B-1 X B+1 = B-1
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PUSH DLOAD # 8D
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HI6ZEROS
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STORE PITCHANG
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STOVL YAWANG # ZERO OUT ANGLES
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CALL
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*SMNB*
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STODL RLM # PRE-MULTIPLY RLM BY (NBSA) MATRIX(B0)
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RLM +2
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PUSH DSU
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RLM
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DMP
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1OVSQRT2
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STODL RLM +2
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DAD DMP
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RLM
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1OVSQRT2
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STOVL RLM # R B-1
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RLM
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UNIT PDVL
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# Page 488
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RLM
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VPROJ VSL2 # PROJECTION OF R ONTO LM XZ PLANE.
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HIUNITY
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BVSU BOV # CLEAR OVERFLOW INDICATOR IF ON
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RLM
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COVCNV
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COVCNV UNIT BOV # EXIT ON OVERFLOW
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SBANDEX
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PUSH VXV # URP VECTOR B-1
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HIUNITZ
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VSL1 VCOMP # UZ X URP = -(URP X UZ)
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STORE RLM # X VEC B-1
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DOT PDVL # SGN(X.UY) UNSCALED
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HIUNITY
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RLM
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ABVAL SIGN
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ASIN # ASIN((SGN(X.UY))ABV(X)) REV B0
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STOVL PITCHANG
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URP
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DOT BPL
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HIUNITZ
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NOADJUST # YES, -90 TO +90
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DLOAD DSU
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HIDPHALF
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PITCHANG
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STORE PITCHANG
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NOADJUST VLOAD VXV
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UR # Z = (UR X URP)
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URP
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VSL1
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STODL RLM # Z VEC B-1
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PITCHANG
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SIN VXSC
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HIUNITZ
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PDDL COS
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PITCHANG
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VXSC VSU
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HIUNITX # (UX COS ALPHA) - (UZ SIN ALPHA)
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DOT PDVL # YAW.Z
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RLM
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RLM
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ABVAL SIGN
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ASIN
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STORE YAWANG
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SBANDEX EXIT
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CA EXTVBACT
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MASK BIT5 # IS BIT5 STILL ON
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EXTEND
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BZF ENDEXT # NO
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CAF PRIO5
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# Page 489
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TC PRIOCHNG
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CAF V06N51 # DISPLAY ANGLES
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TC BANKCALL
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CADR GOMARKFR
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TC B5OFF # TERMINATE
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TC B5OFF # PROCEED
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TC ENDOFJOB # RECYCLE
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CAF BIT3 # IMMEDIATE RETURN
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TC BLANKET # BLANK R3
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CAF PRIO4
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TC PRIOCHNG
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TC SBANDANT +2 # YES, CONTINUE DISPLAYING ANGLES.
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V06N51 VN 0651
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1OVSQRT2 2DEC .7071067815 # 1/SQRT(2)
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UR EQUALS 0D
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URP EQUALS 6D
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SBANK= LOWSUPER
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# END OF LNYAIDE .001 ***
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