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@ -30,30 +30,27 @@
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# Page 551
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# TPI SEARCH
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#
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# PROGRAM DESCRIPTION S17.1 AND S17.2
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#
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# FUNCTIONAL DESCRIPTION
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#
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# THE TPI SEARCH ROUTINE DETERMINES THE MINIMUM TOTAL VELOCITY TRANSFER TRAJECTORY FROM A GIVEN TPI
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# THE TPI SEARCH ROUTINE DETERMINES THE MINIMUM TOTAL VELOCITY TRANSFER TRAJECTORY FROM A GIVEN TPI
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# MANEUVER TIME WITHIN THE CONSTRAINT OF A SAFE PERICENTER. THIS VELOCITY IS THE SUM OF THE IMPULSIVE VELOCITIES
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# FOR THE TPI AND TPF MANEUVERS.
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#
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# THE S17.1 ROUTINE EXTRAPOLATES THE STATE VECTORS OF BOTH VEHICLES TO THE TPI TIME AND COMPUTES THE
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# RELATIVE PHASE ANGLE BETWEEN THE VEHICLES, THE ALTITUDE DIFFERENCE (I.E., THE MAGNITUDE DIFFERENCE OF THE
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# THE S17.1 ROUTINE EXTRAPOLATES THE STATE VECTORS OF BOTH VEHICLES TO THE TPI TIME AND COMPUTES THE
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# RELATIVE PHASE ANGLE BETWEEN THE VEHICLES, THE ALTITUDE DIFFERENCE(I.E. THE MAGNITUDE DIFFERENCE OF THE
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# POSITION VECTORS) AND SELECTS A SEARCH SECTOR BASED ON THE SIGN OF THE ALTITUDE DIFFERENCE.
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#
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# THE S17.2 ROUTINE FURTHER DEFINES THE SEARCH SECTOR BY COMPUTING ANGULAR LIMITS AND USES THE TIME THETA
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# THE S17.2 ROUTINE FURTHER DEFINES THE SEARCH SECTOR BY COMPUTING ANGULAR LIMITS AND USES THE TIME THETA
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# SUBROUTINE TO COMPUTE THE SEARCH START AND END TIMES. THE SEARCH IS THEN MADE IN AN ITERATIVE LOOP USING THE
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# LAMBERT SUBROUTINE TO COMPUTE THE VELOCITIES REQUIRED AT TPI TIME AND AT TPF TIME. EXIT FROM THE SEARCH LOOP
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# IS MADE WHEN SOLUTION CRITERIA ARE MET (NORMAL EXIT) OR AS SOON AS IT IS EVIDENT THAT NO SOLUTION EXISTS IN
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# THE SECTOR SEARCHED.
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#
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# CALLING SEQUENCE
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#
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# BOTH ROUTINES ARE CALLED IN INTERPRETIVE CODE AND RETURN VIA QPRET. S17.1 HAS ONLY A NORMAL EXIT.
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# S17.2 RETURNS VIA QPRET FOR NORMAL EXIT AND TO ALARUMS FOR ERROR EXIT.
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#
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# S17.2 RETURNS VIA QPRET FOR NORMAL EXIT AND TO ALARUMS FOR ERROR EXIT.
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# SUBROUTINES CALLED
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#
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# CSMCONIC
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@ -69,11 +66,11 @@
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EBANK= RACT3
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# **** TEMPORARY ****
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# **** TEMPORARY ****
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HPE 2DEC 157420.0 B-29 # EARTH'S MIN. PERICENTER ALTITUDE 85 N.M.
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HPL 2DEC 10668.0213 B-29 # MOON'S MIN. PERICENTER ALTITUDE 35000 FT.
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HPL 2DEC 10668.0213 B-29 # MOON:S MIN. PERICENTER ALTITUDE 35000FT
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CDSEC 2DEC 40000
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@ -301,7 +298,7 @@ JUNCT3 VLOAD
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SL*
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0,2
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STORE HP
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# ITSWICH DENOTES INTERPOLATION -- SOLUTION ACCEPTANCE IS FORCED
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# ITSWICH DENOTES INTERPOLATION--SOLUTION ACCEPTANCE IS FORCED
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BON DLOAD
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ITSWICH
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ENDEN
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@ -315,9 +312,9 @@ JUNCT3 VLOAD
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BMN DSU # (HPLIM-HPO)-(HPLIM-HP)=HP-HPO
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INTERP # SOLUTION AT HAND
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BMN DLOAD
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ALARUMS # IT'S GETTING WORSE -- SOUND THE ALARM
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ALARUMS # IT'S GETTING WORSE - SOUND THE ALARM
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CDSEC
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JUNCT1 BOFF DCOMP # OFF IS PLUS, ON IS MINUS
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JUNCT1 BOFF DCOMP # OFF IS PLUS ON IS MINUS
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KFLAG
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+1
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STORE DELTEE
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@ -386,7 +383,7 @@ ENDEN VLOAD
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RELDELV
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SIGN STADR # NOW SIGN(RELDELV)=SIGN(SG2)
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STCALL RELDELV
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TRANSANG # COMPUTE OMEGA T, CENTRAL ANGLE
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TRANSANG # COMPUTE OMEGA T , CENTRAL ANGLE
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VLOAD DOT
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RACT3
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# Page 558
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@ -417,8 +414,7 @@ NEXUS STODL NN1
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COUNT 07/XANG
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# CENTRAL ANGLE SUBROUTINE
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#
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# THIS SUBROUTINE COMPUTES THE CENTRAL ANGLE OF TRAVEL OF THE
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# THIS SUBROUTINE COMPUTES THE CENTRAL ANGLE OF TRAVEL OF THE
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# PASSIVE VEHICLE DURING THE TRANSFER.
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TRANSANG STQ SETPD
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@ -435,9 +431,9 @@ TRANSANG STQ SETPD
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PDVL VSR* # SQRT MU (+18 OR +15) 00D
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RPASS4
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0,2
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ABVAL PDDL* # MAGNITUDE OF R (+29 OR +27) 02D
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ABVAL PDDL* # MAGNITUDE OF R (+29 OR +27) 02D
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MUTABLE,1
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PDVL VSQ # 1/MU (+34 OR +28) 04D
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PDVL VSQ # 1/MU (+34 OR +28) 04D
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VVEC
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NORM DMPR # PUSH LIST AT 02D
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X1
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@ -445,12 +441,12 @@ TRANSANG STQ SETPD
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DMP SRR*
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02D
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0 -3,1
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BDSU # R V**/MU (+6)
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BDSU # R V**/MU (+6)
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D1/32
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NORM PDDL
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X1 # (2 - R V**/MU) (+6-N)
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SR1R DDV # MAGNITUDE OF R (+30 OR +28)
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SL* PUSH # R/(2 - R V**/MU) (+29 OR +27) 02D
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SL* PUSH # R/(2 - R V**/MU) (+29 OR +27)02D
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0 -5,1
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SR1 SQRT
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DMP
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@ -475,9 +471,9 @@ TRANSANG STQ SETPD
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# TPI SEARCH DISPLAY ROUTNE
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P17 TC AVFLAGA # AVFLAG = CSM, SET TRACK + UPDATE FLAGS
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P17 TC AVFLAGA # AVFLAG = CSM , SET TRACK + UPDATE FLAGS
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TC P17.1
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P77 TC AVFLAGP # AVFLAG = LEM, SET TRACK + UPDATE FLAGS
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P77 TC AVFLAGP # AVFLAG = LEM , SET TRACK + UPDATE FLAGS
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P17.1 TC P20FLGON # SET UPDATE FLAG
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CAF V06N37 # DISPLAY TTPI TIME
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TC VNP00H
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@ -487,15 +483,15 @@ P17.1 TC P20FLGON # SET UPDATE FLAG
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S17.1 # UPDATE STATE VECTORS TO TTPI
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SET AXT,1
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UPDATFLG
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DEC 2 # DELTA H = 2 K POSITIVE, KFLAG OFF
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DEC 2 # DELTA H = 2 K POSITIVE , KFLAG OFF
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BOFF AXT,1
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KFLAG
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+2
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DEC 1 # DELTA H = 1 K NEGATIVE, KFLAG ON
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DEC 1 # DELTA H = 1 K NEGATIVE , KFLAG ON
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# Page 560
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SXA,1 EXIT
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OPTION2
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CAF V06N72 # DISPLAY PHI, DELTA H, SEARCH OPTION K
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CAF V06N72 # DISPLAY PHI , DELTA H , SEARCH OPTION K
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TC VNCOMP17
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TC INTPRET
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CLEAR SET
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@ -519,9 +515,9 @@ P17.2 STCALL HPERMIN
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S17.2
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SET EXIT
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UPDATFLG
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P17.3 CAF V06N58 # DISPLAY DELTA VTPI, DELTA VTPF, AND H
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P17.3 CAF V06N58 # DISPLAY DELTA VTPI , DELTA VTPF , AND H
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TC VNCOMP17
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CAF V06N55 # DISPLAY PERICENTER CODE AND CENTRAL ANG,
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CAF V06N55 # DISPLAY PERICENTER CODE AND CENTRAL ANG.
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TC BANKCALL
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CADR GOFLASHR
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TC GOTOP00H # TERMINATE PROGRAM
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@ -554,4 +550,3 @@ ALARUMS SET EXIT
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TC VNCOMP17
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TC GOTOP00H # PROCEED ILLEGAL TERMINATE PROGRAM
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V06N72 VN 0672
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