LUMINARY Memo 160: Descent Trajectory Monitor Package · DATE FEBRUARY 16, 1970") LM TIMELINE BOOK...

Massachusetts Institute of TechnologyC. S. Draper Laboratory

Cambridge, Massachusetts

LUMINARY Memo #160

To:

From:

Date:

Subject:

Distribution

David Moore

16 July 1970

Descent Trajectory Monitor Package

Summary:

The LMS at KSC has asked for a comparison of the Descent Trajectory

Monitor Chart between that supplied by MPAD (LM Timeline Book, 2/16/70)

and that supplied by MIT all digital simulation data (Luminary ID-level 4-

Lunar Landing). The package is included in the memo and has been sent to

KSC for verification on the LMS.

Purpose:

Ascertain reason for apparent difference in VI, H, and H during descent

as monitored on LMS/KSC and compared with MPAD/LM Timeline data.

Test :

Obtain nominal all-digital simulation, plot VI, HDOT, H with VI, H, H

from MPAD/LM Timeline vs. Time in Powered Descent. Ascertain curve

relationship of each curve (if curves coincidence, the data corresponds; if

curves parallel, the data corresponds). The curves are on Figures 1, 2 and 3.

Results:

The curves are seen to be essentially parallel in that a general shape

pattern is followed. The maximum error evident from the plots is:

VI (Figure 1) - 3%

H (Figure 2) -2%

HDOT (Fig. 3) -10%

The greatest difference in the HDOT curves is 10%; however it is noticed that

the general curve shape of each curve is approximately the same. The curves

converge at throttle down and at higate and otherwise follow a pattern of

essentially the same shape. The VI and H curves differ only slightly'.

I

Data was also available from LM TIMELINE BOOK (3/16/7) and

included in the plots of Figures 4, 5, and 6. These curves are similar

to those of Figures 1, 2 and 3 in that a general shape pattern is also

followed.

For both sets of LM TIMELINE data, the curves are of the samefaimily; in that, if f(V), f(HDOT), f(H) are the trajectory curves as plotted;

f^ is MIT data, f^ is MPAD data: Then

f2(V) = f^(V) +

f2(HDOT) = f^(HDOT) +

f^{H) = f^(H) +

where each C is a constant by which the curves of Figures 1-6 differ.

This means that a percentage error plot should tell that the curves do

not converge; i. e., the C in the equations does not vary along the trajectory.

If the C does vary, however, the curves will converge and the percentage

error will be small at the points of convergence. For example in Fig. 1,

200 so that the percentage error at 4500 fps is less than that at 1000

fps. The C in that case does not vary as the curves plainly show no

convergence. On the other hand. Figure 3 implies a varying along

the curve which is evidenced by the convergence of the curves at T=390(throttle-down) and T=480 (HIGATE).

Conclusion:

Readily apparent from the plots is the fact that the initial state of all

sets of data closely agree. However, it is not so apparent what trajectory

information was given to the simulated AGC so that the curves in Figures1-6 resulted. Possible differences include:

A. Terrain model difference

B. Trajectory target parameter difference

The main conclusion is that KSC/LMS should use the MIT/DL all-digital

simulation initialization included in this memo to ascertain possibility of

agreement between simulations. Failure of agreement between LMS/KSCand MIT then would open questions as to consistency of simulations.

Agreement between the simulators would imply inconsistent initialization

and communication of the correct data would be encouraged.

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DESCENT TRAJECTORY MONITORPACKAGE

The following package contains

A. DESCENT TRAJECTORY TIME CHARTB. ERASABLE PADLOADC. INITIALIZATION EDIT (ENV. vs. AGOD. ASTRONAUT FILE

E. EVENT LIST

DESCENT TRAJECTORY TIME CHART

T(from TIG) V H H MODE

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480 575. 7 -173. 7 9777

510 364. 6 -135. 6 4761 64

540 232. 9 -57. 6 1674

570 132. 2 COCO1 641

600 56. 2 -6. 3 294

630 6. 7 -3.5 141

660 0 -1.3 66 66

690 0 -1. 3 20 66

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'•O'-'’

••"'C

t)

i. SR 00 2

KODCUMPSLAPl

Cf-DUMPENVMODEPi fci

rFf>Ur^!>--

ntiMp

DiiHP

CfDUMPi}l)HP

DUTYCYCLESLAP I

API360 INTI +2CEAOACCS +l^i’40LL JOB F7.1777

2fU C

2 OLE2 DEC

TCL^^M

W Y L E P

NUVLEEl + 2

NASA i'^)?All?’-\^l NEW SIMULATIONCOMMON

MAKSRUT 19001320 7 MOORE.

D

PRINT nrr

VERiFY WITHIN 20 MUDF 00 THEN WAIT 2 V 4H EIF V 01 N A6 THEN WAIT 1 V 21 f 21112 E WAI T 3 PKnCEED

IE V Ob N AH Ti-ii-N I'UTW 1 LEPPAIiAk . [

)-

niSPLAY INERTIAL DATA ON WAIT 1 -

IF V 06 N 61 Then WAIT 2 PROCEED WAIT 2

IF V 60 N ]6 T.HEN CUJiOEMODE PRIMARY SCSiUiDL AUTO WAIT 2 PKUCEbOIF V 60 N IH THF-N WAIT 2 FNIFR

l.MTHROT ID WA PRfiCFI- nWAIT. TOO V 67 E WAIT 10 V 34 EWAIT 30 V 67 £ WAIT 25 V 34 E WAITVERIFY WITHIN 120 NUABORT V Oo N 6

1 I.LMRADAR OFF WAIT 60 V 57 E W_K3 UNFQ »99999 THEN GO TU IRON

OTHERWISE V 3A L WAIT 10 V 67 F GO Ul TkYIT ENDAlRGN wait 6 PROCEED

A WAITi 26 V 67 E WAIT 6 PROCEED WAIT ^ 10' PROCEED ^ 2ALROFF IF V 06 N 64 THEN W 2 PROCEED W 2A LRHCKAU: LFMhCTKL R -6 A .03 LRHCi^Ar r V'^999 Lt MHCTKL R 0 W .6A W 16 •

A1 LRHCR AT_i^-9.9996 LFMHCTRL 0 -5 W .03 LRHCRA IF 99999 L.EMHCTRL Q 0 W . 6A LRHCRATE 99W9 LEMHCfRL U -5 W .03 LKHCRATE 99*^99 LEMHCTRL Q 0 W .5ACONT S 72 H'

INPUTPRU

000000000 00

IF V Oo N 4 3 THEN WAIT 2WAIT 5 V 69 E

END OF' ASTRONAUT INPUT CAROS.

LABEL TRYM IS £>WH tf 2 9 2 l H I

LABEL LRUN IS IWN ft

LABF.L LKOFF IS E.ii '' ? y / )

LABEL CUNT IS i- jN U / JH.’ J')

]- L JUill 1 i AL T T

6, 0/,OM(tnooooo 02 - I . 404 964 1 46^9 03 ^3. u jci

JVERSE ROUTI NE IS U Sli F. I 'ni iMRKlij EiU)H JULY 1, I97r IHRUUGH JULY 1971

EVENT LIST (AGC TIME)

TIG = 372791.

5

THROTTLE-UP = 372817. 5

THROTTLE-DOWN = 373195.

HIGATE = 373298

REDES (-AZ) = 373304.5

REDES (+E1;) = 373321.

0

REDES (+EL) = 373322.4

LOGATE = 373450. 7

TOUCHDOWN = 373496

ADDENDUM to LUMINARY Memo #160

Summary :

A further study of the Descent Trajectory Monitor Package of

Luminary Memo #160 led to an all-digital simulation at MIT/DL using a

smooth moon in the environment and the LGC; i. e. no terrain model used.

This data was compared with the LM Timeline chart of 3/16/70 and the

result was found to be that the LM Timeline data corresponds much better

with the MIT/DL data without terrain than MIT/DL data with terrain. The

H and VI plots are such that the general curve shape is followed nearly

coincidental. The HDOT curve follows a general shape pattern nearly

parallel with a constant difference of about 8 fps until throttle -recovery,

at which time the curves for LM Timeline Data and MIT/DL continue

nearly coincidental to the end of the run sample period.

Suggestion :

Communication of Apollo 14 (Luminary ID) trajectory parameters,

using the latest known Fra Mauro terrain parameters, to all simulators

so that the Descent Trajectory Monitor chart for a final Apollo 14 LMTimeline Book can be verified from independent observers at MSC,

KSC, and MIT/DL.

LUMINARY Memo 160: Descent Trajectory Monitor Package · DATE FEBRUARY 16, 1970") LM TIMELINE BOOK...

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Transcript of LUMINARY Memo 160: Descent Trajectory Monitor Package · DATE FEBRUARY 16, 1970") LM TIMELINE BOOK...