| Quellcodebibliothek Statistik Leitseite products/Sources/formale Sprachen/Asm/Apollo-11/Comanche055/ Datei vom 11.9.2026 mit Größe 36 kB |
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Quelle P37_P70.agc Sprache: Apollo |
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# Copyright: Public domain. # Filename: P37_P70.agc # Purpose: Part of the source code for Colossus 2A, AKA Comanche 055. # It is part of the source code for the Command Module's (CM) # Apollo Guidance Computer (AGC), for Apollo 11. # Assembler: yaYUL # Contact: Jim Lawton <jim.lawton@gmail.com>. # Website: www.ibiblio.org/apollo. # Pages: 890-933 # Mod history: 2009-05-11 JVL Adapted from the Colossus249/ file # of the same name, using Comanche055 page # images. # 2009-05-20 RSB Added missing label V2T179. Fixed POODOO -> POODOO. # 2009-05-23 RSB In RTD18, corrected a STOVL DELVLVC to # STODL DELVLVC and a STODL 02D to STORE 02D. # # This source code has been transcribed or otherwise adapted from digitized # images of a hardcopy from the MIT Museum. The digitization was performed # by Paul Fjeld, and arranged for by Deborah Douglas of the Museum. Many # thanks to both. The images (with suitable reduction in storage size and # consequent reduction in image quality as well) are available online at # www.ibiblio.org/apollo. If for some reason you find that the images are # illegible, contact me at info@sandroid.org about getting access to the # (much) higher-quality images which Paul actually created. # # Notations on the hardcopy document read, in part: # # Assemble revision 055 of AGC program Comanche by NASA # 2021113-051. 10:28 APR. 1, 1969 # # This AGC program shall also be referred to as # Colossus 2A # Page 890 BANK 31 SETLOC RTE1 BANK EBANK= RTEDVD COUNT 31/P37 # PROGRAM DESCRIPTION: P37, RETURN TO EARTH # # DESCRIPTION # A RETURN TO EARTH TRAJECTORY IS COMPUTED PROVIDED THE CSM IS OUTSIDE THE LUNAR SPHERE OF INFLU # TIME OF IGNITION. INITIALLY A CONIC TRAJECTORY IS DETERMINED AND RESULTING IGNITION AND REE # DISPLAYED TO THE ASTRONAUT. THEN IF THE ASTRONAUT SO DESIRES, A PRECISION TRAJECTORY IS DETE # RESULTING IGNITION AND REENTRY PARAMETERS DISPLAYED. UPON FINAL ACCEPTANCE BY THE ASTRONA # COMPUTES AND STORES THE TARGET PARAMETERS FOR RETURN TO EARTH FOR USE BY SPS PROGRAM (P40) OR R # # CALLING SEQUENCE # L TC P37 # # SUBROUTINES CALLED # PREC100 # V2T100 # RTENCK2 # RTENCK3 # TIMERAD # PARAM # V2T100 # GAMDV10 # XT1LIM # DVCALC # RTENCK1 # INTSTALL # INTEGRVS # RTEVN # RTEDISP # TMRAD100 # AUGEKUGL # LAT-LONG # TMRAD100 # TIMERAD # INVC100 # CSMPREC # GETERAD # TIMETHET # P370ALRM # VN1645 # POLY # # ERASABLE INITIALIZATION REQUIRED # CSM STATE VECTOR # Page 891 # NJETSFLG NUMBER OF JETS IF THE RCS PROPULSION SYSTEM SELECTED STATE FLAG 0=4 JETS 1=2 JETS # # ASTRONAUT INPUT # SPRTETIG TIME OF IGNITION (OVERLAYS TIG) DP B28 CS # VPRED DESIRED CHANGE IN VELOCITY AT TIG(PROGRM COMPUTED IF 0) DP B7 METERS/CS # GAMMAEI DESIRED FLIGHT PATH ANGLE AT REENTRY (COMPUTED IF 0) DP B0 REVS + ABOVE HORIZ. # OPTION2 PROPULSION SYSTEM OPTION SP B14 1=SPS, 2=RCS # # OUTPUT # CONIC OR PRECISION TRAJECTORY DISPLAY # VPRED VELOCITY MAGNITUDE AT 400,000 FT. ENTRY ALTITUDE DP B7 METERS/CS # T3TOT4 TRANSIT TIME TO 400,000 FT. ENTRY ALTITUDE DP B28 CS # GAMMAEI FLIGHT PATH ANGLE AT 400,00 FT. ENTRY ALTITUDE DP B0 REVS + ABOVE HORIZON # DELVLVC INITIAL VELOCITY CHANGE VECTOR IN LOCAL VERTICAL COORD. VECTOR B7 METERS/CS # LAT(SPL) LATITUDE OF THE LANDING SITE DP B0 REVS # LNG(SPL) LONGITUDE OF THE LANDING SITE DP B0 REVS # TARGETING COMPUTATION DISPLAY # TIG RECOMPUTED TIG BASED ON THRUST OPTION DP B28 CS # TTOGO TIME FROM TIG DP B28 CS # +MGA POSITIVE MIDDLE GIMBAL ANGLE DP B0 REVS -.02 IF REFSMFLG=0 # THRUST PROGRAM COMMUNICATION # XDELVFLG EXTERNAL DELTA V FLAG STATE FLAG SET 0 FOR LAMBERT AIMPT # NORMSW LAMBERT AIMPT ROTATION SWITCH STATE FLAG SET 0 FOR NO ROTATION # ECSTEER CROSS PRODUCT STEERING CONSTANT SP B2 SET 1 # RTARG CONICALLY INTEGRATED REENTRY POSITION VECTOR VECTOR B29 METERS # TPASS4 REENTRY TIME DP B28 CS P37 TC PHASCHNG # P37 IS NOT RESTARTABLE OCT 4 TC INTPRET AXT,1 SXA,1 OCT 04000 ECSTEER DLOAD ZEROVECS STORE VPRED STORE GAMMAEI EXIT CAF V6N33RTE # INPUT TIG STORED IN SPRTETIG TCR P370GOF # OVERLAYED WITH TIG TCF -2 # DISPLAY NEW DATA CAF V6N60RTE # INPUT REENTRY ANGLE IN GAMMAEI TCR P37GFRB1 # AND DESIRED DELTA V IN RTEDVD TCF -2 # DISPLAY NEW DATA RTE299 TC INTPRET SSP DLOAD OVFIND 0 VPRED # Page 892 STODL RTEDVD GAMMAEI STODL RTEGAM2D 1RTEB13 STODL CONICX1 C4RTE STCALL MAMAX1 INVC100 # GET R(T1)/,V(T1)/,UR1/,UH/ CLEAR DLOAD SLOWFLG RTEDVD BPL ABS RTE317 STORE RTEDVD DLOAD DSU R(T1) K1RTE BMN SET RTE317 SLOWFLG RTE317 DLOAD EXIT R(T1) TC POLY DEC 2 2DEC 181000434. B-31 2DEC 1.50785145 B-2 2DEC* -6.49993057 E-9 B27* 2DEC* 9.76938926 E-18 B56* TC INTPRET SL1 STODL MAMAX2 # C0+C1*R+C2*R**2+C3*R**3=MAMAX2 B30 M9RTEB28 STODL NN1A K2RTE RTE320 STODL RCON # RCON=K2 RTEGAM2D BZE BDSU RTE340 # GOTORTE340 IF REENTRY ANGLE NOT INPUT 1RTEB2 PUSH COS # PL02D PDDL SIN BDDV STADR # PL00D STCALL X(T2) # X(T2)=COT(GAM2D) B0 RTE360 RTE340 DLOAD DSU R(T1) # Page 893 K1RTE BMN DLOAD RTE350 K4RTE STCALL X(T2) # X(T2)=K4 RTE360 RTE350 DLOAD K3RTE STORE X(T2) # X(T2)=K3 RTE360 CALL V2T100 BZE GOTO RTE367 RTEALRM RTE367 VLOAD R(T1)/ STODL RVEC RCON STOVL RDESIRED V2(T1)/ STCALL VVEC TMRAD100 DAD T1 STODL T2 RTEGAM2D BZE GOTO RTE369 RTE372 RTE369 VLOAD ABVAL V(T2)/ EXIT TC POLY DEC 2 2DEC 0 2DEC -4.8760771 E-2 B4 2DEC 4.5419476 E-4 B11 2DEC -1.4317675 E-6 B18 TC INTPRET DAD RTED1 SL3 GOTO # X(T2),=D1+D2V2+D3V2**2+D4V2**3 RTE373 RTE372 DLOAD # X(T2),=X(T2) X(T2) RTE373 DSU PUSH # X(T2)ERR B0 PL02D # Page 894 X(T2) VLOAD UNIT R(T2)/ # B58 STCALL ALPHAV GETERAD DAD E3RTE PUSH DSU # RCON,=(E1/1+E2BETA11)**.5)+E3 B29 PL04D RCON ABS DSU EPC2RTE BMN GOTO RTE374 RTE375 RTE374 DLOAD ABS 00D DSU BMN EPC3RTE P37E RTE375 DLOAD DAD NN1A 1RTEB28 BMN SLOAD RTE380 OCT605 GOTO RTEALRM # TOO MANY ITERATIONS RTE380 STORE NN1A DSU BZE M8RTEB28 RTE385 DLOAD DSU 00D DRCON NORM PDDL # X(T2)ERR-X(T2)ERR,=Z1 PL06D X1 RPRE' DSU DDV # X(T2)PRI-X(T2)=Z2 PL04D X(T2) DMP SL* # DX(T2)=X(T2)ERR(Z2/Z1) 00D 0,1 GOTO RTE390 RTE385 DLOAD # DX(T2)=X(T2)ERR 00D RTE390 STODL 16D # DX(T2) PL02D STADR STODL RCON # RCON=RCON, BOV # Page 895 RTE360 STODL DRCON # X(T2)ERR,=X(T2)ERR X(T2) STODL RPRE' # X(T2)PRI=X(T2) 16D DAD X(T2) STCALL X(T2) # X(T2)=X(T2)+DX(T2) RTE360 # REITERATE P37E CALL # DISPLAY CONIC SOLUTION RTEVN RTE505 DLOAD DMP PCON BETA1 BDSU BZE RCON RTE510 BMN DLOAD RTE510 1RTEB2 GOTO # ENTRY NEAR APOGEE RTE515 RTE510 DLOAD DCOMP # ENTRY NEAR PERIGEE 1RTEB2 RTE515 STCALL PHI2 PREC100 # PRECISION TRAJECTORY COMPUTATION RTE625 BZE P37G RTEALRM CALL P370ALRM EXIT TCF P37 # RECYCLE AFTER ALARM DISPLAY # RETURN TO EARTH DISPLAY SUBROUTINE RTEVN STQ CALL VNSTORE RTEDISP # DISPLAY PREPARATION EXIT CAF V6N61RTE # LATITUDE,LONGITUDE,BLANK TCR P370GOFR # IN LAT(SPL),LNG(SPL),- CAF FOUR TCR 37BLANK +1 TCF +5 TCF P37 # RECYCLE CAF V6N39RTE # T21 HRS,MIN,SEC IN T3TOT4 TCR P370GOF TCF P37 # RECYCLE CAF V6N60RTE # DISPLAY BLANK,V(T2),FPA2 TCR P37GFRB1 # IN -,VPRED,GAMMAEI # Page 896 TCF P37 # RECYCLE CAF V6N81RTE # DISPLAY DELTA V (LV) IN DELVLVC TCR P370GOF TCF P37 # RECYCLE TCR INTPRET GOTO VNSTORE # PRECISION DISPLAY, TARGETING COMPUTATION AND RTE END PROCESSING P37G CALL RTEVN EXIT P37N CAF SEVEN TS OPTION1 CAF ONE TS OPTION2 CAF V4N06RTE # DISPLAY RCS OR SPS OPTION SPS ASSUMED TCR P370GOF TCF -2 # RECYCLE TC INTPRET # PROCEED SETPD SLOAD 00D OPTION2 DSU BZE 1RTEB13 P37Q SLOAD NORM # SPS EMDOT X1 PDDL GOTO VCSPS P37T P37Q DLOAD BON # RCS MDOTRCS NJETSFLG P37R SL1 P37R SL1 NORM PDDL X1 VCRCS P37T PDDL DDV # DV/VC B7 -B5 = B2 PL02D DV EXIT TC POLY DEC 1 2DEC 5.66240507 E-4 B-3 2DEC 9.79487897 E-1 B-1 # Page 897 2DEC -.388281955 B1 TC INTPRET PUSH SLOAD # (1-E)**(-DV/VC)=A B3 PL04D WEIGHT/G DMP DDV # DTB=(M0/MDOT)A B16+B3-B3=B16 PL00D SL* DMP 0 -12D,1 CSUBT BDSU T1 STORE TIG # TIG=T1-CT*DTB B28 EXIT CAF V6N33RTE # DISPLAY BIASED TIG TCR P370GOF TCF -2 CAF ZERO TS VHFCNT TS TRKMKCNT TC INTPRET CALL # CONICALLY INTEGRATE FROM R1,V1 OVER T12 RTENCK1 VLOAD UNIT # PL00D R(T2)/ PDVL VXSC # UR2 B1 PL06D UR1/ MCOS7.5 PDVL VXSC # -UR1(COS7.5) B1 PL12D UH/ MSIN7.5 VAD DOT # K/=-UR1(COS7.5)-UH(SIN7.5) B2 PL00D DAD BMN MCOS22.5 P37W VLOAD DOT # K/ . UR2 GR COS22.5 UH/ R(T2)/ BMN DLOAD P37U THETA165 PUSH GOTO P37V P37U DLOAD PUSH THETA210 P37V SIN STODL SNTH COS CLEAR RVSW STOVL CSTH R(T1)/ # Page 898 STOVL RVEC V2(T1)/ STCALL VVEC TIMETHET P37W CLEAR CLEAR XDELVFLG NORMSW SET VLOAD FINALFLG STADR STODL RTARG T DAD T1 STOVL TPASS4 V2(T1)/ VSU V(T1)/ STCALL DELVSIN VN1645 GOTO P37W # SUBROUTINE TO GO TO GOFLASHR AND BLANK R1 P37GFRB1 EXTEND QXCH SPRTEX TCR P370GOFR 37BLANK CAF ONE TCR BLANKET TCF ENDOFJOB TC SPRTEX # RECYCLE TCF P37PROC # PROCEED # SUBROUTINE TO GO TO GOFLASHR P370GOFR EXTEND QXCH RTENCKEX TCR BANKCALL CADR GOFLASHR TCF GOTOPOOH # TERMINATE TCF +3 TCF +4 TC RTENCKEX # IMMEDIATE RETURN INDEX RTENCKEX # PROCEED TCF 0 +4 INDEX RTENCKEX # RECYCLE TCF 0 +3 # SUBROUTINE TO GO TO GOFLASH # Page 899 P370GOF EXTEND QXCH SPRTEX TCR BANKCALL CADR GOFLASH TCF GOTOPOOH TCF +2 TC SPRTEX P37PROC INDEX SPRTEX TCF 0 +1 V6N33RTE VN 0633 V4N06RTE VN 0406 V6N61RTE VN 0661 V6N39RTE VN 0639 V6N60RTE VN 0660 V6N81RTE VN 0681 BANK 32 SETLOC RTE BANK COUNT 32/RTE # Page 900 # ALARM DISPLAY SUBROUTINE P370ALRM STQ EXIT SPRTEX CA MPAC TC VARALARM CAF V5N09RTE TC BANKCALL CADR GOFLASH TCF GOTOPOOH TCF -4 TC INTPRET GOTO SPRTEX V5N09RTE VN 0509 # Page 901 # TIME RADIUS CALLING SUBROUTINE # # INPUT # RVEC INITIAL POSITION VECTOR VECTOR B29 METERS # VVEC INITIAL VELOCITY VECTOR VECTOR B7 METERS/CS # RDESIRED FINAL RADIUS FOR WHICH TRANSFER TIME IS TO BE COMPUTED DP B29 METERS # CONICX1 X1 SETTING FOR CONIC SUBROUTINES -2=EARTH SP B14 # # OUTPUT # R(T2)/ FINAL POSITION VECTOR VECTOR B29 METERS # V(T2)/ FINAL VELOCITY VECTOR VECTOR B7 METERS/CS # T12 TRANSFER TIME TO FINAL RADIUS DP B28 CS TMRAD100 STQ CLEAR RTENCKEX RVSW AXC,2 SXA,2 OCT 20000 SGNRDOT LXC,1 CALL CONICX1 TIMERAD STOVL V(T2)/ PL00D STADR STODL R(T2)/ T STCALL T12 RTENCKEX # Page 902 # DISPLAY CALCULATION SUBROUTINE # # DESCRIPTION # OUTPUT FOR DISPLAY IS CONVERTED TO PROPER UNITS AND PLACED IN OUTPUT STORAGE REGISTERS. LAND # COMPUTATION FOR DETERMINING LANDING SITE LATITUDE AND LONGITUDE IS INCLUDED IN THE ROUTINE # # CALLING SEQUENCE # L CALL # L+1 RTEDISP # # SUBROUTINES CALLED # TMRAD100 # AUGEKUGL # LAT-LONG # # ERASABLE INITIALIZATION REQUIRED # PUSHLIST # NONE # MPAC # NONE # OTHER # R(T2)/ FINAL POSITION VECTOR VECTOR B29 METERS # V(T2)/ FINAL VELOCITY VECTOR VECTOR B7 METERS/CS # T2 FINAL TIME DP B28 CS # V2(T1)/ POST IMPULSE INITIAL VELOCITY VECTOR VECTOR B7 METERS/CS # V(T1)/ INITIAL VELOCITY VECTOR VECTOR B7 # UR1/ UNIT INITIAL VECTOR VECTOR B1 # UH/ UNIT HORIZONTAL VECTOR VECTOR B1 # # OUTPUT # VPRED VELOCITY MAGNITUDE AT 400,000 FT. ENTRY ALTITUDE DP B7 METERS/CS # T3TOT4 TRANSIT TIME TO 400,000 FT. ENTRY ALTITUDE DP B28 CS # GAMMAEI FLIGHT PATH ANGLE AT 400,000 FT. ENTRY ALTITUDE DP B0 REVS + ABOVE HORIZ # DELVLVC INITIAL VELOCITY CHANGE VECTOR IN LOCAL VERTICAL COORD. VECTOR B7 METERS/CS # LAT(SPL) LATITUDE OF THE LANDING SITE DP B0 REVS # LNG(SPL) LONGITUDE OF THE LANDING SITE DP B0 REVS RTEDISP STQ VLOAD # DISPLAY SPRTEX V(T2)/ UNIT PDDL 36D STODL VPRED # V(T2) T2 DSU SPRTETIG STOVL T3TOT4 # T21 R(T2)/ UNIT DOT SL1 # Page 903 ARCCOS BDSU 1RTEB2 STOVL GAMMAEI # FLIGHT PATH ANGLE T2 V2(T1)/ VSU PUSH V(T1)/ DOT DCOMP UR1/ PDVL PUSH DLOAD PDVL ZERORTE DOT VDEF UH/ VSL1 STODL DELVLVC DELVLVC BOFF DCOMP RETROFLG RTD18 STORE DELVLVC # NEGATE X COMPONENT, RETROGRADE RTD18 VLOAD ABVAL DELVLVC STOVL VGDISP R(T2)/ STORE RVEC # ***** LANDING SITE COMPUTATION ***** ABVAL DSU 30480RTE STOVL RDESIRED V(T2)/ STCALL VVEC TMRAD100 # R3,V3,T23 FROM TIMERAD VLOAD UNIT R(T2)/ PDVL UNIT # UR3 PL06D V(T2)/ DOT SL1 # GAMMAE=ARCSIN(UR3 . UV3) PL00D ARCSIN PDDL # V(T3) PL02D 36D PDDL ABS PUSH CALL # /GAMMAE/ PL04D AUGEKUGL # PHIE PL06D DAD DAD T12 # T23 T2 STORE 02D # T(LS)=T2&T23&TE SLOAD BZE P37RANGE RTD22 STORE 04D # OVERRIDE RANGE (PCR 261) RTD22 DLOAD SIN # Page 904 04D STODL LNG(SPL) # LNG(SPL)=SIN(PHIE) PL04D COS STORE LAT(SPL) # LAT(SPL)=COS(PHIE) VLOAD UNIT R(T2)/ PUSH PUSH PDVL UNIT # PL22D V(T2)/ PDVL VXV VXV UNIT # UH3=UNIT(UR3 X UV3 X UR3) PL10D VXSC PDVL LNG(SPL) VXSC VAD # PL04D LAT(SPL) CLEAR CLEAR # T(LS) IN MPAC ERADFLAG LUNAFLAG STODL ALPHAV # ALPHAV=UR3(COSPHIE)+UH3(SINPHIE) PL02D CALL LAT-LONG DLOAD LAT STODL LAT(SPL) # LATITUDE LANDING SITE ***** LONG STCALL LNG(SPL) # LONGITUDE LANDING SITE ***** SPRTEX COUNT* $$/RTE # Page 905 # INITIAL VECTOR SUBROUTINE # # DESCRIPTION # A PRECISION INTEGRATION OF THE STATE VECTOR TO THE TIME OF IGNITION IS PERFORMED. PRECOMPUTA # # CALLING SEQUENCE # L CALL # L+1 INVC100 # # NORMAL EXIT MODE # AT L+2 OF CALLING SEQUENCE WITH MPAC = 0 # # ALARM EXIT MODE # AT L+2 OF CALLING SEQUENCE WITH MPAC = OCTAL 612 FOR STATE VECTOR IN MOONS SPHERE OF INFLUENCE # # SUBROUTINES CALLED # CSMPREC # # ERASABLE INITIALIZATION REQUIRED # PUSHLIST # NONE # MPAC # NONE # OTHER # SPRTETIG TIME OF IGNITION DP B28 CS # CSM STATE VECTOR # # OUTPUT # R(T1)/ INITIAL POSITION VECTOR AT TIG VECTOR B29 METERS # V(T1)/ INITIAL VELOCITY VECTOR AT TIG VECTOR B7 METERS/CS # T1 INITIAL VECTOR TIME (TIG) DP B28 CS # UR1/ UNIT INITIAL VECTOR VECTOR B1 # UH/ UNIT HORIZONTAL VECTOR VECTOR B1 # CFPA COSINE OF INITIAL FLIGHT PATH ANGLE DP B1 INVC100 STQ DLOAD SPRTEX SPRTETIG STCALL TDEC1 CSMPREC # PRECISION INTEGRATION R0,V0 TO R1,V1 VLOAD SXA,2 RATT P(T1) STOVL R(T1)/ VATT STODL V(T1)/ TAT STORE T1 SLOAD BZE P(T1) # Page 906 INVC109 INVC107 SLOAD GOTO OCT612 RTEALRM # R1,V1 NOT IN PROPER SPHERE OF INFLUENCE INVC109 VLOAD UNIT R(T1)/ STODL UR1/ # UR1/ B1 36D STOVL R(T1) # R(T1) B29 V(T1)/ UNIT STORE UV1/ DOT SL1 UR1/ STORE CFPA # CFPA B1 ABS DSU EPC1RTE BMN DLOAD INVC115 # NOT NEAR RECTILINEAR 1RTEB2 PDDL PUSH ZERORTE VDEF PUSH # N/ = (0,0,1) GOTO INVC120 INVC115 VLOAD VXV UR1/ UV1/ PUSH # N/ = UR X UV B2 INVC120 CLEAR DLOAD RETROFLG PUSH BPL INVC125 VLOAD VCOMP # RETROGRADE ORBIT PUSH SET RETROFLG INVC125 VLOAD VXV UNIT UR1/ STORE UH/ # UH/ B1 GOTO SPRTEX # Page 907 # PRECISION TRAJECTORY COMPUTATION SUBROUTINE # # DESCRIPTION # A NUMERICALLY INTEGRATED TRAJECTORY IS GENERATED WHICH FOR THE RETURN TO EARTH PROBLEM SATI # CONSTRAINTS (RCON AND X(T2)) ACHIEVED BY THE INITIAL CONIC TRAJECTORY AND MEETS THE DVD REQU # AS POSSIBLE. # # CALLING SEQUENCE # L CALL # L+1 PREC100 # # NORMAL EXIT MODE # AT L+2 OF CALLING SEQUENCE WITH MPAC = 0 # # ALARM EXIT MODE # AT L+2 OF CALLING SEQUENCE WITH MPAC = # OCTAL 605 FOR EXCESS ITERATIONS # OCTAL 613 FOR REENTRY ANGLE OUT OF LIMITS # # SUBROUTINES CALLED # INTSTALL # RTENCK2 # RTENCK3 # TIMERAD # PARAM # V2T100 # # ERASABLE INITIALIZATION REQUIRED # PUSHLIST # NONE # MPAC # NONE # OTHER # R(T1)/ INITIAL POSITION VECTOR VECTOR B29/B27 METERS # V2(T1)/ POST IMPULSE INITIAL VELOCITY VECTOR VECTOR B7/B5 METERS/CS # V(T1)/ INITIAL VELOCITY VECTOR VECTOR B7/B5 METERS/CS # T1 INITIAL VECTOR TIME DP B28 CS # T12 INITIAL TO FINAL POSITION TIME DP B28 CS # RCON CONIC FINAL RADIUS DP B29/B27 METERS # R(T1) MAGNITUDE OF INITIAL POSITION VECTOR DP B29/B27 METERS # X(T2) COTANGENT OF FINAL FLIGHT PATH ANGLE DP B0 # X(T1) COTANGENT OF INITIAL FLIGHT PATH ANGLE DP B5 # RTEDVD DELTA VELOCITY DESIRED DP B7/B5 METERS/CS # MAMAX1 MAJOR AXIS LIMIT FOR LOWER BOUND ON GAMDV ITERATOR DP B30/B28 METERS # MAMAX2 MAJOR AXIS LIMIT FOR UPPER BOUND ON GAMDV ITERATOR DP B30/B28 METERS # UR1/ UNIT INITIAL VECTOR VECTOR B1 # UH/ UNIT HORIZONTAL VECTOR VECTOR B1 # BETA1 1+X(T2)**2 DP B1 # PHI2 PERIGEE OR APOGEE INDICATOR DP B2 -1 PERIGEE, +1 APOGEE # # Page 908 # # OUTPUT # V2(T1)/ POST IMPULSE INITIAL VELOCITY VECTOR VECTOR B7 METERS/CS # R(T2)/ FINAL POSITION VECTOR VECTOR B29 METERS # V(T2)/ FINAL VELOCITY VECTOR VECTOR B7 METERS/CS # T2 FINAL TIME DP B28 CENTISECONDS # # DEBRIS # RD FINAL R DESIRED DP B29/B27 METERS # R/APRE R/A DP B6 # P/RPRE P/R DP B4 # RPRE MAGNITUDE OF R(T2)/ DP B29/B27 METERS # X(T2)PRE COTANGENT OF GAMMA2 DP B0 # DT12 CORRECTION TO FINAL TIME T2 DP B28 CENTISECONDS # RCON FINAL RADIUS DP B29/B27 METERS # DRCON DELTA RCON DP B29/B27 METERS PREC100 STQ DLOAD SPRTEX 10RTE STODL NN1A RCON STORE RD PREC120 DLOAD 2RTEB1 STODL DT21PR # DT21PR = POSMAX M15RTE STCALL NN2 RTENCK3 PREC125 CALL PARAM DLOAD P STODL P/RPRE R1A STODL R/APRE R1 STODL RPRE COGA SL 5 STORE X(T2)PRE DCOMP DAD X(T2) ABS DSU EPC4RTE BOV BMN PREC130 PREC175 # DESIRED REENTRY ANGLE NOT ACHIEVED # Page 909 PREC130 DLOAD BMN NN2 PREC140 PREC132 SLOAD GOTO # TOO MANY ITERATIONS OCT605 # EXIT WITH ALARM PRECX # DETERMINE RADIUS AT WHICH THE DESIRED REENTRY ANGLE WILL BE ACHIEVED PREC140 DLOAD BZE NN1A PREC162 PREC150 DLOAD SL2 B2 P/RPRE DMP SL1 # BETA2=BETA1*P/R B2 PL02 BETA1 PUSH DLOAD R/APRE SL4 DMP 00D BDSU BMN # BETA3=1-BETA2*R/A 1RTEB4 PREC160 PREC155 SL2 SQRT DMP BDSU PHI2 1RTEB3 NORM PDDL X1 SR1 DDV # BETA4=BETA2/(1-PHI2*SQRT(BETA3)) SL* GOTO B1 0 -1,1 PREC165 PREC160 DLOAD NORM R/APRE X1 BDDV SL* B1 1RTEB1 0 -6,1 GOTO PREC165 PREC162 DLOAD NORM RPRE X1 BDDV SL* # BETA4=RD/RPRE B1 RD 0 -1,1 PREC165 SETPD PUSH 0 DSU DCOMP # Page 910 1RTEB1 STORE BETA12 BMN DLOAD PREC168 X(T2)PRE BMN DLOAD PREC167 BETA12 DCOMP STORE BETA12 PREC167 DLOAD BETA12 PREC168 ABS DSU EPC6RTE BMN DLOAD PREC175 DMP SL1 RPRE PUSH # RF = NEW RADIUS PREC170 DLOAD DAD NN2 1RTEB28 STORE NN2 VLOAD SET R(T2)/ RVSW STOVL RVEC V(T2)/ SIGN BETA12 STODL VVEC 1RTEB1 SIGN DCOMP BETA12 LXA,2 DLOAD MPAC LXC,1 SXA,2 CONICX1 SGNRDOT STCALL RDESIRED # COMPUTED DT12 (CORRECTION TO TIME OF TIMERAD # NEW RADIUS) DLOAD SIGN T BETA12 PDDL NORM # DT21=(PHI4)DT21 PL02D DT21PR X1 BDDV SL* 00D 0 -3,1 # Page 911 PUSH BMN # BETA13=(DT21)/(DT21PR) R3 PL04D PREC172 DLOAD PDDL # BETA14=1 B0 PL04D 2RTEB1 GOTO PREC173 PREC172 DLOAD PDDL # BETA14=.6 B0 PL04D M.6RTE PREC173 DDV DSU 02D 1RTEB3 BMN DLOAD PREC174 DMP DT21PR STORE 00D # DT21=(BETA14)DT21PR B28 PREC174 DLOAD PUSH 00D STCALL DT21PR RTENCK2 GOTO PREC125 PREC175 DLOAD DSU RPRE RD PUSH ABS # RPRE-RD = RERR DSU BMN EPC7RTE PREC220 # DESIRED RADIUS HAS NOT BEEN ACHIEVED DLOAD BZE NN1A PREC132 # TOO MANY ITERATIONS DSU BZE 10RTE PREC207 PREC205 DLOAD DSU # NOT FIRST PASS OF ITERATION RPRE' RPRE # RPRE'-RPRE B29/B27 NORM BDDV X2 DRCON SL* PUSH # DRCON/(RPRE'-RPRE)=S B2 0 -2,2 DAD BOV # S GR +4 OR LS -4 1RTEB1 PREC205M ABS DSU # Page 912 1RTEB1 BMN PREC206 PREC205M DLOAD DCOMP # S GR 0 OR LS -4 2RTEB1 PDDL # S=-4 B2 PREC206 DLOAD DMP SL2 STORE DRCON # DRCON=S(RERR) B29 DAD RCON STORE RCON # RCON+DRCON=RCON GOTO PREC210 PREC207 DLOAD DSQ # FIRST PASS OF ITERATION RD NORM SR1 X1 PDDL NORM RPRE X2 XSU,1 BDDV X2 SR* 0 -1,1 STORE RCON # RD**2/RPRE=RCON DSU RD STORE DRCON # RCON-RD=DRCON PREC210 DLOAD # PREPARE FOR NEXT ITERATION RPRE STODL RPRE' NN1A DSU 1RTEB28 STCALL NN1A V2T100 BHIZ GOTO PREC120 PRECX # DESIRED RADIUS ACHIEVED SETLOC RTE2 BANK PREC220 DLOAD DSU X(T2) X(T2)PRE ABS DSU EPC8RTE # Page 913 BMN SLOAD PREC225 OCT613 GOTO PRECX # IF REENTRY ANGLE OUT OF LIMITS EPC8RTE 2DEC .002 OCT613 OCT 613 # DESIRED FINAL ANGLE HAS BEEN REACHED. SETLOC RTE BANK PREC225 DLOAD ZERORTE PRECX GOTO SPRTEX # Page 914 # INTEGRATION CALLING SUBROUTINE # # DESCRIPTION # PERFORMS CONIC AND PRECISION INTEGRATIONS USING SUBROUTINE INTEGRVS. THERE ARE THREE ENTR # RTENCK2, AND RTENCK3) FOR DIFFERENT SOURCES OF INPUT AND DIFFERENT OPTIONS. THERE IS A COMMO # WHICH INCLUDES SET UP OF INPUT FOR THE PARAM SUBROUTINE. # # RTENCK1 (CONIC INTEGRATION) # # CALLING SEQUENCE # L CALL # L+1 RTENCK1 # # ERASABLE INITIALIZATION REQUIRED # SAME AS FOR THE RTENCK3 ENTRANCE # # RTENCK2 (PRECISION INTEGRATION) # # CALLING SEQUENCE # L CALL # L+1 RTENCK2 # # ERASABLE INITIALIZATION REQUIRED # PUSHLIST # PUSHLOC-2 INTEGRATION TIME DT12 (CORRECTION TO T2) DP B28 CS # OTHER # R(T2)/ FINAL POSITION VECTOR VECTOR B29 METERS # V(T2)/ FINAL VELOCITY VECTOR VECTOR B7 METERS/CS # T2 FINAL TIME DP B28 CS # # RTENCK3 (PRECISION INTEGRATION) # # CALLING SEQUENCE # L CALL # L+1 RTENCK3 # # ERASABLE INITIALIZATION REQUIRED # R(T1)/ INITIAL POSITION VECTOR VECTOR B29 METERS # V2(T1)/ POST IMPULSE INITIAL VELOCITY VECTOR VECTOR B7 M/CS # T1 INITIAL VECTOR TIME DP B28 CS # T2 FINAL TIME DP B28 CS # # EXIT MODE # AT L+2 OF CALLING SEQUENCE # # SUBROUTINES CALLED # INTSTALL # INTEGRVS # # OUTPUT # PUSHLIST # Page 915 # PUSHLOC-6 FINAL POSITION VECTOR R(T2)/ VECTOR B29 METERS # X1 CONICS MUTABLE ENTRY FOR EARTH (-2) SP B14 # MPAC # FINAL VELOCITY VECTOR V(T2)/ VECTOR B7 M/CS # OTHER # R(T2)/ AS IN PUSHLIST # V(T2)/ AS IN MPAC # T2 FINAL TIME DP B28 CS SETLOC RTE3 BANK RTENCK1 STQ CALL RTENCKEX INTSTALL VLOAD SET R(T1)/ INTYPFLG GOTO RTENCK3B RTENCK2 STQ CALL RTENCKEX INTSTALL CLEAR VLOAD INTYPFLG R(T2)/ STOVL RCV V(T2)/ STODL VCV T2 STORE TET DAD GOTO RTENCK3D RTENCK3 STQ CALL RTENCKEX INTSTALL RTENCK3A VLOAD CLEAR R(T1)/ INTYPFLG RTENCK3B STOVL RCV V2(T1)/ STODL VCV T1 STODL TET T2 # Page 916 RTENCK3D STORE TDEC1 CLEAR CALL MOONFLAG INTEGRVS VLOAD RATT STORE R(T2)/ PDDL LXC,1 TAT CONICX1 STOVL T2 VATT STORE V(T2)/ GOTO RTENCKEX SETLOC RTE BANK # Page 917 # V2(T1) COMPUTATION SUBROUTINE # # DESCRIPTION # A POST IMPULSE VELOCITY VECTOR (V2(T1)) IS COMPUTED WHICH EITHER # (1) MEETS THE INPUT VELOCITY CHANGE DESIRED (RTEDVD) IN A MINIMUM TIME OR # (2) IF A VELOCITY CHANGE ISN'T SPECIFIED (RTEDVD = 0), A V2(T1) IS COMPUTED WHICH MINIMIZES T # AND CONSEQUENTLY FUEL. # # CALLING SEQUENCE # L CALL # L+1 V2T100 # # NORMAL EXIT MODE # AT L+2 OF CALLING SEQUENCE WITH MPAC = 0 # # ALARM EXIT MODE # AT L+2 OF CALLING SEQUENCE WITH MPAC = OCTAL 605 FOR EXCESS ITERATIONS. # # SUBROUTINES CALLED # GAMDV10 # XT1LIM # DVCALC # # ERASABLE INITIALIZATION REQUIRED # PUSHLIST # NONE # MPAC # NONE # OTHER # R(T1) MAGNITUDE OF INITIAL POSITION VECTOR DP B29/B27 METERS # RCON MAGNITUDE OF FINAL POSITION VECTOR DP B29/B27 METERS # V(T1)/ INITIAL VELOCITY VECTOR VECTOR B7/B5 METERS/CS # RTEDVD DELTA VELOCITY DESIRED DP B7/B5 METERS/CS # UR1/ UNIT INITIAL VECTOR VECTOR B1 # UH/ UNIT HORIZONTAL VECTOR VECTOR B1 # X(T2) COTANGENT OF FINAL FLIGHT PATH ANGLE DP B0 # X(T1) COTANGENT OF INITIAL FLIGHT PATH ANGLE (INPUT FOR PREC) DP B5 # CFPA COSINE OF INITIAL FLIGHT PATH ANGLE DP B1 # MAMAX1 MAJOR AXIS LIMIT FOR LOWER BOUND ON GAMDV ITERATOR DP B30/B28 METERS # MAMAX2 MAJOR AXIS LIMIT FOR UPPER BOUND ON GAMDV ITERATOR DP B30/B28 METERS # PHI2 REENTRY NEAR PERIGEE OR APOGEE INDICATE (RTE ONLY) DP B2 -1 PERIGEE, +1 APOGEE # N1 CONIC OR PRECISION ITERATION OPERATOR DP B28 NEGATIVE CONIC, PLUS PREC # # OUTPUT # V2(T1)/ POST IMPULSE INITIAL VELOCITY VECTOR VECTOR B7/B5 METERS/CS # DV INITIAL VELOCITY CHANGE DP B7/B5 METERS/CS # X(T1) COTANGENT OF INITIAL FLIGHT PATH ANGLE (POST IMPULSE) DP B5 # PCON SEMI-LATUS RECTUM DP B28/B26 METERS # BETA1 1+X(T2)**2 DP B1 # # Page 918 # # DEBRIS # PUSHLIST # 00D X(T1),,=PREVIOUS PRECISION X(T1) DP B5 # 02D THETA1=BETA5*LAMBDA-1 TP B17 # 05D THETA2=2*R(T1)*(LAMBDA-1) TP B38/B36 # 08D THETA3=MU**.5/R(T1) DP B-4/B-5 # 10D X(T1)MIN=LOWER BOUND ON X(T1) IN GAMDV ITERATOR DP B5 # 12D DX(T1)MAX=MAXIMUM DELTA X(T1) DP B5 # 14D X(T1)MAX=UPPER BOUND ON X(T1) IN GAMDV ITERATOR DP B5 # 16D DX(T1)=ITERATOR INCREMENT DP B5 # 31D GAMDV10 SUBROUTINE RETURN ADDRESS # 32D DVCALC SUBROUTINE RETURN ADDRESS # 33D V2T100 SUBROUTINE RETURN ADDRESS V2T100 STQ DLOAD 33D RCON BMN DSU # ABORT IF RCON NEGATIVE V2TERROR R(T1) BMN V2T101 V2TERROR EXIT # OR IF LAMBDA LESS THAN ONE TC POODOO # NO SOLUTION IF LAMBDA LESS THAN 1 OCT 00610 V2T101 SETPD CLEAR 0 # PL00D F2RTE DLOAD NORM RCON X1 PDDL NORM R(T1) S1 STORE 10D SR1 DDV # R1/RCON = LAMBDA B1 XSU,1 PDDL # PL02D S1 X(T2) DSQ SR1 DAD 1RTEB1 STORE BETA1 # 1+X(T2)**2 = BETA1 B1 DMP 00D STORE 28D # BETAI*LAMBDA = BETA5 DMP SL* 00D 0 -7,1 SL* DSU # Page 919 0 -7,1 1RTEB17 RTB PDDL # BETA5*LAMBDA-1 = THETA1 B17 PL05D TPMODE 1RTEB1 SR* DCOMP 0,1 DAD DMP 00D R(T1) SL* RTB 0 -7D,1 TPMODE PDDL # 2*R(T1)*(LAMBDA-1)=THETA2 B38/B36 PL08D RTMURTE NORM SR1 X2 XSU,2 DDV S1 10D SR* PDDL # MU**.5/R(T1)=THETA3 B-4/B-5 PL10D 6,2 MAMAX1 PUSH PUSH # MAMAX1=MA CALL XT1LIM DCOMP PUSH # X(T1)MIN B5 PL12D DCOMP SR4 PDDL PUSH # DX(T1)MAX B5 PL14D MAMAX2 PUSH CALL XT1LIM PDDL BMN # X(T1)MAX B5 PL16D NN1A V2T102 GOTO V2T110 # PROCEED HERE IF NOT PRECISION COMPUTATION V2T102 DLOAD RTEDVD BZE GOTO V2T105 V2T140 V2T105 DLOAD BMN CFPA V2T140 GOTO V2T145 # Page 920 # DURING A PRECISION TRAJECTORY ITERATION CONSTRAIN THE INDEPENDENT # VARIABLE TO INSURE THAT ALL CONICS PASS THROUGH RCON ON THE SAME PASS # THROUGH X(T2) V2T110 DLOAD RTB 1RTEB17 TPMODE DCOMP PDDL # -1 B17 PL19D 2RTEB1 SR* DSU 0,1 00D DMP SL* 28D 0 -7,1 SL* TAD 0 -7,1 RTB PDDL # BETA5(2-LAMBDA)-1=BETA6 B17 PL19D TPMODE X(T1) STORE 00D # X(T1),, B5 TLOAD # PL16D BMN BZE V2T115 V2T115 SL GOTO 7 V2T120 V2T115 DLOAD BMN PHI2 V2T125 DCOMP STODL PHI2 10RTE STORE NN1A GOTO V2T125 V2T120 SQRT RTB DPMODE PDDL BMN # BETA6**.5=X(T1)LIM B5 PL18D PHI2 V2T130 DLOAD STADR STORE 14D # X(T1)LIM = X(T1)MAX DCOMP STORE 10D # -X(T1)LIM = X(T1)MIN V2T125 DLOAD BZE X(T1) V2T140 BMN GOTO # Page 921 V2T140 V2T145 V2T130 DLOAD BZE X(T1) V2T135 BMN DLOAD # PL16D V2T135 STADR STORE 10D # X(T1)LIM = X(T1)MIN GOTO V2T145 V2T135 DLOAD DCOMP # PL16D STADR STORE 14D # -X(T1)LIM = X(T1)MAX V2T140 DLOAD 10D STODL X(T1) # X(T1)MIN = X(T1) 12D PUSH GOTO # DX(T1)MAX = DX(T1) PL18D V2T150 V2T145 DLOAD 14D STODL X(T1) # X(T1)MAX = X(T1) 12D DCOMP PUSH # -DX(T1)MAX = DX(T1) PL18D V2T150 CALL # GOTO X(T1)-DV ITERATOR GAMDV10 DLOAD BZE # EXIT IF MINIMUM FUEL MODE RTEDVD V2T1X # CONTINUE IF TIME CRITICAL MODE DSU BMN DV V2T155 GOTO V2T175 V2T155 DLOAD BMN NN1A V2T160 GOTO V2T185 # CONIC TRAJECTORY COMPUTATION V2T160 DLOAD BZE X(T1) V2T165 BMN GOTO # Page 922 V2T165 V2T300 V2T165 DLOAD BZE CFPA V2T300 BMN DLOAD V2T300 14D STODL X(T1) # X(T1)MAX=X(T1) 12D DCOMP STCALL 16D # -DX(T1)MAX=DX(T1) GAMDV10 DLOAD DSU RTEDVD DV BMN V2T300 V2T175 SET DLOAD F2RTE X(T1) BOFF SLOWFLG V2T177 STODL 10D # X(T1)MIN 12D # DX(T1)MAX GOTO V2T179 V2T177 STODL 14D 12D DCOMP V2T179 STCALL 16D # DX(T1) GAMDV10 DLOAD BMN NN1A V2T300 # PREVENT A LARGE CHANGE IN INDEPENDENT VARIABLE DURING AN ITERATION FOR A # PRECISION TRAJECTORY V2T185 DLOAD DSU X(T1) 00D ABS PDDL # /X(T1)-X(T1),,/ = BETA7 12D SL1 BDSU BMN DLOAD V2T300 00D # CONTINUE IF BETA7 LARGER THAN 2DX(T1)MAX STORE X(T1) # X(T1),, = X(T1) # Page 923 DSU BMN 14D V2T195 DLOAD 14D STORE X(T1) # X(T1)MAX = X(T1) GOTO V2T205 V2T195 DLOAD DSU X(T1) 10D BMN GOTO V2T200 V2T205 V2T200 DLOAD 10D STORE X(T1) # X(T1)MIN = X(T1) V2T205 CALL DVCALC V2T300 DLOAD ZERORTE V2T1X GOTO 33D # Page 924 # X(T1)-DV ITERATOR SUBROUTINE # # DESCRIPTION # COMPUTES A POST IMPULSE VELOCITY VECTOR (V2(T1)) WHICH REQUIRES A MINIMUM DV. # # CALLING SEQUENCE # L CALL # L+1 GAMDV10 # # NORMAL EXIT MODE # AT L+2 OF CALLING SEQUENCE # # ALARM EXIT MODE # AT V2T1X WITH MPAC = OCTAL 605 FOR EXCESS ITERATIONS # # SUBROUTINES CALLED # DVCALC # # ERASABLE INITIALIZATION REQUIRED # PUSHLIST # 02D THETA1=BETA5*LAMBDA-1 TP B17 # 05D THETA2=2*R(T1)*(LAMBDA-1) TP B38/B36 # 08D THETA3=MU**.5/R(T1) DP B-4/B-5 # 10D X(T1)MIN=LOWER BOUND ON INDEPENDENT VARIABLE X(T1) DP B5 # 12D DX(T1)MAX=MAXIMUM DX(T1) DP B5 # 14D X(T1)MAX=UPPER BOUND ON INDEPENDENT VARIABLE X(T1) DP B5 # 16D DX(T1)=ITERATOR INCREMENT DP B5 # MPAC # NONE # OTHER # V(T1)/ INITIAL VELOCITY VECTOR VECTOR B7/B5 METERS/CS # RTEDVD DELTA VELOCITY DESIRED DP B7/B5 METERS/CS # UR1/ UNIT INITIAL VECTOR VECTOR B1 # UH/ UNIT HORIZONTAL VECTOR VECTOR B1 # X(T1) COTANGENT OF INITIAL FLIGHT PATH ANGLE (FROM VERTICAL) DP B5 # F2RTE TIME CRITICAL OR MINIMUM FUEL MODE INDICATOR STATE AREA 0 MIN. FUEL, 1 MIN. TIME # # OUTPUT # V2(T1)/ POST IMPULSE INITIAL VELOCITY VECTOR VECTOR B7/B5 METERS/CS # DV INITIAL VELOCITY CHANGE DP B7/B5 METERS/CS # X(T1) COTANGENT OF INITIAL FPA MEASURED FROM VERTICAL DP B5 # PCON SEMI-LATUS RECTUM DP B28/B26 METERS # # DEBRIS # PUSHLIST # 00D X(T1),, # 02D THETA1 # 05D THETA2 # 08D THETA3 # 10D X(T1)MIN # 12D DX(T1)MAX # Page 925 # 14D X(T1)MAX # 16D DX(T1) # 22D DV,=PREVIOUS DV DP B7/B5 # 24D BETA9=X(T1)+1.1DX(T1) DP B5 # 31D GAMDV10 SUBROUTINE RETURN ADDRESS # 32D DVCALC SUBROUTINE RETURN ADDRESS # 33D V2T100 SUBROUTINE RETURN ADDRESS GAMDV10 STQ 31D SETPD CALL 18D # PL18D DVCALC DLOAD DSU 14D 10D BOV GAMDV20 PUSH DSU # X(T1)MAX-X(T1)MIN=BETA8 B5 PL20D EPC9RTE BMN DLOAD GAMDVX # BOUNDS CLOSE TOGETHER 18D DSU BMN # BETA8-DX(T1)MAX 12D GAMDV15 SETPD GOTO # PL18D 18D GAMDV20 GAMDV15 DLOAD # PL18D SIGN SR1 16D STORE 16D # BETA8(SIGNDX(T1))/2=DX(T1) GAMDV20 DLOAD M144RTE STORE NN2 GAMDV25 DLOAD DAD NN2 1RTEB28 BMN SLOAD GAMDV30 OCT605 GOTO V2T1X GAMDV30 STORE NN2 # NN2=NN2+1 DLOAD PDDL # X(T1)=X(T1), B5 PL20D X(T1) DV PDDL DAD # DV=DV, B7/B5 PL22D X(T1) 16D # Page 926 STCALL X(T1) # X(T1)+DX(T1)=X(T1) B5 DVCALC BON DLOAD F2RTE GAMDV35 DV DSU BMN # CONTINUE IF FUEL CRITICAL MODE 20D GAMDV33 GAMDV32 DLOAD DCOMP 16D SR1 STORE 16D GAMDV33 SETPD GOTO 18D # PL18D GAMDV50 # TIME CRITICAL MODE GAMDV35 DLOAD DSU RTEDVD DV PDDL PUSH # DVD-DV=DVERR B7/B5 PL22D GAMDV40 DLOAD ABS # DV, PL24D 20D DSU BMN EPC10RTE GAMDVX GAMDV45 BOVB DLOAD TCDANZIG # ASSURE OVFIND IS 0 BDSU NORM DV X2 PDDL # DV-DV, B7/B5-N2 PL22D NORM SR1 # DVERR B8/B6-N1 X1 DDV PDDL # DVERR/ DV - DV BDSU DMP # PL18D X(T1) XSU,1 X2 STORE 16D # PRESERVE SIGN IF OVERFLOW SR* BOV 0 -1,1 GAMDV47 STORE 16D # (X(T1)-X(T1),)DVERR/(DV-DV,)=DX(T1) ABS DSU 12D BMN GAMDV50 # Page 927 GAMDV47 DLOAD SIGN 12D 16D STORE 16D # DX(T1)MAX(SIGNDX(T1))=DX(T1) # CHECK TO KEEP INDEPENDENT VARIABLE IN BOUNDS GAMDV50 DLOAD DMP 16D 1.1RTEB1 SL1 DAD X(T1) STORE 24D # X(T1)+1.1DX(T1)=BETA9 B5 DSU BMN 14D GAMDV55 DLOAD DSU 14D X(T1) SR1 STCALL 16D # (X(T1)MAX-X(T1))/2=DX(T1) B5 GAMDV65 GAMDV55 DLOAD DSU 24D 10D BMN GOTO GAMDV60 GAMDV65 GAMDV60 DLOAD DSU 10D X(T1) SR1 STORE 16D # (X(T1)MIN-X(T1))/2=DX(T1) B5 GAMDV65 DLOAD ABS 16D DSU BMN EPC9RTE GAMDVX GOTO GAMDV25 GAMDVX GOTO 31D # Page 928 # DV CALCULATION SUBROUTINE # # INPUT # PUSHLIST # 02D THETA1=BETA5*LAMBDA-1 TP B17 # 05D THETA2=2*R(T1)*(LAMBDA-1) TP B38/B36 # 08D THETA3=MU**.5/R(T1) DP B-4/B-5 # OTHER # X(T1) COTANGENT OF POST IMPULSE INITIAL FLIGHT PATH ANGLE DP B5 # V(T1)/ INITIAL VELOCITY VECTOR (PRE IMPULSE) VECTOR B7/B5 METERS/CS # UR1/ UNIT INITIAL VECTOR VECTOR B1 # UH/ UNIT HORIZONTAL VECTOR VECTOR B1 # # OUTPUT # V2(T1)/ POST IMPULSE INITIAL VELOCITY VECTOR VECTOR B7/B5 METERS/CS # DV INITIAL VELOCITY CHANGE DP B7/B5 METERS/CS # PCON SEMI-LATUS RECTUM DP B28/B26 METERS # # DEBRIS # 28D THETA3*PCON**.5 DP B10/B8-N1 # C(PUSHLOC) THETA3(PCON**.5)*X(T1)*UR1/ VECTOR B7/B5 # 32D DVCALC SUBROUTINE RETURN ADDRESS # X1 NORMALIZATION FACTOR FOR VALUE IN 28D # # PUSHLOC IS RESTORED TO ITS ENTRANCE VALUE UPON EXITING DVCALC DVCALC STQ DLOAD 32D X(T1) DSQ SR 7 DCOMP TAD 02D NORM PUSH X1 TLOAD NORM 05D X2 RTB SR1 DPMODE XSU,2 DDV X1 SR* 6,2 STORE PCON # THETA2/(THETA1-X(T1)**2)=PCON B28/26 SQRT DMP 08D NORM X1 STODL 28D # THETA3*PCON**.5 B10/B8 -N1 # Page 929 X(T1) NORM VXSC X2 UR1/ # X(T1)*UR1/ B5+B1 -N2 XAD,2 VXSC X1 28D VSR* PDVL # THETA3(PCON**.5)X(T1)*UR1/ B7/B5 0 -9D,2 # + UH/ VXSC VSR* # THETA3(PCON**.5)UH/ B7/B5 28D 0 -4,1 # = VAD STADR STORE V2(T1)/ # V2(T1)/ B7/B5 VSU ABVAL V(T1)/ STORE DV # ABVAL(V2(T1)/-V1(T)/)=DV B7/B5 GOTO 32D # Page 930 # SUBROUTINE TO COMPUTE BOUNDS ON INDEPENDENT VARIABLE X(T1) # # INPUT # PUSHLIST # PUSHLOC -4 MAJOR AXIS (MA) DP B30/B28 # PUSHLOC -2 MAJOR AXIS (MA) AGAIN DP B30/B28 # 28D BETA5=LAMBDA*BETA1 DP B9 # OTHER # RCON DP B29/B27 # R(T1) DP B29/B27 # # OUTPUT # MPAC # X(T1)LIM LIMIT ON INDEPENDENT VARIABLE X(T1) DP B5 # # DEBRIS # PUSHLIST # C(PUSHLOC) MA-RCON DP (B30/28)-N1 # C(PUSHLOC) +2 MA DP B30/B28 # X1 NORMALIZATION FACTOR FOR MA-RCON # 20D XT1LIM SUBROUTINE RETURN ADDRESS # # PUSHLOC IS RESTORED TO ITS ENTRANCE VALUE UPON EXITING XT1LIM XT1LIM STQ DLOAD 20D RCON SR1 BDSU NORM PDDL # MA-RCON B30-N1 X2 PDDL SR1 R(T1) BDSU DDV SL* DMP 0 -3,2 28D SL* DSU # BETA10=BETA5(MA-RT)/(MA-RC)-1 B11 0 -6,1 1RTEB25 +1 # 1.0 B-11 SL1 BOV XT1LIM2 BMN GOTO XT1LIM5 XT1LIM3 XT1LIM2 DLOAD # BETA10=POSMAX IF OVERFLOW 2RTEB1 XT1LIM3 SQRT GOTO # X(T1)=SQRT(BETA10) XT1LIMX XT1LIM5 DLOAD ZERORTE XT1LIMX GOTO 20D # Page 931 # CONSTANTS FOR THE P37 AND P70 PROGRAMS AND SUBROUTINES BANK 36 SETLOC RTECON1 BANK 1RTEB1 2DEC 1. B-1 1RTEB2 2DEC 1. B-2 1RTEB3 2DEC 1. B-3 1RTEB4 2DEC 1. B-4 1RTEB10 2DEC 1. B-10 1RTEB12 2DEC 1. B-12 1RTEB13 2DEC 1. B-13 1RTEB17 2DEC 1. B-17 1RTEB25 2DEC 1. B-25 # * * B25 AND B28 MUST BE CONSECUTIVE * * 1RTEB28 2DEC 1. B-28 ZERORTE 2DEC 0 M144RTE 2DEC -144. B-28 M15RTE 2DEC -15 10RTE 2DEC 10 M.6RTE 2DEC -.6 1.1RTEB1 2DEC 1.1 B-1 M6RTEB28 2DEC -6 2RTEB1 2OCT 3777737777 M9RTEB28 2DEC -9 M8RTEB28 2DEC -8 30480RTE 2DEC 30480. B-29 VCSPS 2DEC 31.510396 B-5 # (SEE 2VEXHUST) # Page 932 VCRCS 2DEC 27.0664 B-5 MDOTRCS 2DEC .0016375 B-3 CSUBT 2DEC .5 OCT605 OCT 00605 OCT612 OCT 00612 MCOS7.5 2DEC -.99144486 MSIN7.5 2DEC -.13052619 MCOS22.5 2DEC -.92387953 B-2 THETA165 2DEC .4583333333 THETA210 2DEC .5833333333 EPC1RTE 2DEC .99966 B-1 EPC2RTE 2DEC 100. B-29 EPC3RTE 2DEC .001 EPC4RTE 2DEC .00001 EPC5RTE 2DEC .01 B-6 EPC6RTE 2DEC .000007 B-1 EPC7RTE 2DEC 1000. B-29 EPC9RTE 2DEC 1. B-25 EPC10RTE 2DEC .0001 B-7 BANK 35 SETLOC RTECON1 BANK C4RTE 2DEC -6.986643 E7 B-30 K1RTE 2DEC 7. E6 B-29 K2RTE 2DEC 6495000. B-29 K3RTE 2DEC -.06105 K4RTE 2DEC -.10453 RTMURTE 2DEC 199650.501 B-18 # Page 933 E3RTE 2DEC 121920. B-29
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