PER (SANITIZED) REQUEST AT CLOSE OF REFERENCE MEETING THE FOLLOWING

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04558A001800260005-0
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: April 10, 2008
• Sequence Number: 5
• Publication Date: November 23, 1964
• Content Type: CABLE

Approved For Release 2008/04/10 :CIA-RDP78B04558A001800260005-0
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T O P S
E C R E T 2318022
JJ
PRIORIT~N
P 3343
~ORONA
REF: MEETING HELD AT T-iE REQUEST OF
?J
ON 13 NOVEYIBER EETWEEN
THE REQUIREMENTS FOR A STELLAR/INDEX CAMERA Iid THE
LO~~lING IS A SUMMATION OF THE DISCUSSION PERTAINING TO
REQUIREMENTS FOR A SOURCE OF ACCURATE ATTITUDE DATA IN
WcB25X1
CFC~5X~
TO D I SC ~?S Prrs 25X1
~s -
Acz 25X1 ~
THE FOL- -o~25X1 ~~s-
25X1
THE
25X1.
SYSTEM. THE S/I CAMERA IS CURRENTLY THE ONLY MEANS FOR OBTAINING
THIS DATA.
2. DATA FROM THE S/I CAMERA IS NEEDED BY ~ IN ANSWERING
PROJECT REQUIREMENTS, AS A FACTOR IN QUALITY CONTROL, AND TO NEGATE
OR CONTROL THE ACCUh1ULATION OF ATTITUDE ERRORS FOR MENSURATION
PURPOSES.
A. PROJECTS INVOLVING F~IENSURATION OF MISSILES, AIRCRAFT,
ATO~?~IC ENERGY INDUSTRY, LAUNCHING PADS, RADAR INSTALLATIONS, ETC.
REQUIRE ANSWERS THAT ~1UST BE AS ACCURATE AS POSSIBLE. IN EVERY
ONE OF THE ABOVE TYPES OF MEASUREMENTS IT IS NECESSARY TO CONSIDER
AND TRY TO ELI?~INATE ALL ERRORS, INCLUDING THE PITCH, ROLL, AND
1. PER ~~REQ!JEST ~.T CLOSE OF REFERENCE i~lEETIfJG
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YAW THAT AFFECT THE FINAL RESULTS.
B. HAS A REQUIREMENT THAT IidUOLVES DETERMINING THE
GEOGRAPHIC LATITUDE AND LONG ITUDE OF SELECTED OBJECTS TO THE
ACCURACY OF THE EPHEMERIS. IN ORDER TO COMPLY tJITH THIS REQUEST
IT IS NECESSARY THAT THE PITCH, ROLL, AND YAW BE BETTER THAN THAT
AVAILABLE FROM THE SYSTEM'S ATTITUDE SENSORS.; THAT IS THE
ATTITUDE DETERMINED FROM TELEMETRY AidD REPORTED IN THE MCD.
C. THE PET TEAi4I HAS REQUESTED THAT ~ PROVIDE ATTITUDE 25X1
0 N A TIMELY BASIS AND BARGE ENGINEERS HAVE ALSO IidDICATED AN INTEREST
IN THE ACTUAL ATTITUDE TO ASSIST THEM IN SYUDYIPIG VEHICLE AND
ATTITUDE SENSOR PERFORPQANCE, ETC.
D. IT IS OCCASIONALLY NECESSARY THAT HAVE SPECIAL
PURPOSE LARGE SCALE MAPS PREPARED. THE ACCURACY OF THE MAP IS
DEFINITELY DEPENDENT ON THE ACCURACY OF THE INPUTS, THE MOST
IMPORTANT BEING ACCURATE PITCH, ROLL, AND YAW.
E. ~ IS RESPONSIBLE FOR THE DETERMINATION AND DIS-
TRIBUTION OF ATTITUDE DATA TO OTHER COMPO~JENTS OF THE INTELLIGENCE
COMMUNITY WHO RELY ON THE DATA REDUCED ATOFOR THE SOLUTION
OF THEIR OWN PARTICULAR PROBLEiIS.
3. AS A FACTOR IN OVERALL QUALITY CONTROL THE S/I DATA, ONCE
THE S/I CAMERAS BECOME RELIABLE, WILL BE OF INVALUABLE AID FOR THE
FOLLOWING REASONS:
A. WITH ACCURATE INPUTS TO THE SOLUTION OF A MENSURATION
PROBLEM THERE WILL RESULT AN ELEMENT OF AGREEMENT BETWEEN
COMPONENTS OF THE INTELLIGENCE COMMUNITY IN THE FINAL ANSWERS
FJRWARDED TO HIGHER AUTHORITY WHERE AGREEMENT WITHING THE COMMUNITY
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IS MANDATORY. WHEN ACCURATE INPUTS ARE NOT AVAILABLE VARIOUS
SUBSTITUTE MEANS MUST BE RESORTED T0, OFTEN RESULTION IN DIS-
AGREEMENT IN OBJECT DIMENSIONS AND NECE SSITATING TIME-CONSIMING
RE-EVALUATIONS AND COMPROMISES IN ORDER TO REACH AGREEMENT.
B. A MEANS OF DETERMINING THE VALIDITY OF OTHER DATA. TO
DETERMINE THE ATTITUDE OF THE MAIN CAMERA SYSTEM THE ABSOLUTE
ATTITUDE OF THE S/I CAI~tERA IS FIRST REDUCED, THEN BY THE TECHNIQUE
0 F RELATIVE ORIENTATION THE ATTITUDE PARAMETERS ARE TRANSFERRED TO
THE MAIN CAMERA. IN THE CORO,'dA SYSTEM THE TECHNIQUE OF RELATIVE
ORIENTATION HAS PROVEN TO BE AN IMPORTANT QUALITY CONTROL FACTOR
IN THAT, IF THERE IS DISAGREEMENT IN ATTITUDE PARAMETERS AFTER
APPLYING THE RELATIVE ORIENTATION UALUES, IT BECOMES IMMEDIATELY
APPARENT THAT THERE IS AN ERROR IN OTHER DATA. THIS PROCEDURE
HAS UNCOVERED ERRORS IN THE TRANSMISSION OF DATA IN CABLES,
FAULTY OR GARBLED REDUCTION OF CALIBRATION INFORMATION, AN UN-
SATISFACTORY EPHEMERIS, ERRONEOUS TI~1E, MISTAKEN SIGNS IN COMPUTER
INPUTS, ETC.
4. AT PRESENT D I5 UNDERGOING AN EXTENSIVE ERROR ANALYSIS
THAT IS TO ENCOMPASS ALL CAMERA SYSTEMS. THE NEED FOR THIS ERROR
ANALYSIS STEMS FROM A REQUIREMENT LEVIED BY THE PHOTO INTERPRETERS
WHO DEMAND PRECISE MEASUREMENTS ACCOMPANIED WITH AN ACCURACY STATE-
MENT. ONE OF THE MORE IMPORTANT FACTORS IN THIS ERROR ANALYSIS
I S THE NECESSITY OF DETERI~I IN ING THE ERROR DUE TO PITCH, ROLL,
AND YAW SINCE TELEMETRY DATA IS NOT CONSISTENT. A MORE RELIABLE
SOURCE, SUCH AS THE S/I CAMERAS, MUST BE UTILIZED TO PROVIDE
ATTITUDE SUBJECT TO MEANINGFUL ANALYSIS.
1
STAT
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5. BELIEVES THAT ALL SOURCES OF ERRORS SHOULD BE
MINIMIZED. BELOW IS A PARTIAL LISTING OF THE SOURCES OF ERRORS.
THESE ERRORS TEND TO ACCUMULATE.
A. THE ATTITUDE OF THE CAMERA AT THE INSTANT OF EXPOSURE
C ALTITUDE, PITCH, ROLL, AND YAW) .
B. THE DYNAMIC MOTIONS OF THE CAMERA SYSTEM.
C. EPHEMERIS DATA.
D. SCAN RATES, FILM SPEED RATES, AND RESIDUAL IMC ERRORS.
E. EARTH CURVATURE, REFRACTION, AND CORIOLIS.
F. CALIBRATION INFORMATION, I.E., PRECALIBRATED ANGULAR
RELATION-SHIPS, AND THE INTERIOR ORIENTATION OF THE CAMERA.
G. DIMENSIONAL STABILITY OF THE FILM.
H. INSTRUMENT ERRORS, I.E., THOSE INTRODUCED BY THE MEASURING
ENGINE OR RECTIFICATION SYSTEMS.
I. TIME.
J. THE MATHEMATICAL MODEL OF THE PERSPECTIVE TRANSFOR-
MATION EQUATIONS AND THE COMPUTER PROGRAM.
K. HUMAN ERRORS INTRODUCED BY THE OBSERVER.
6. TO DATE, CONFIDENCE IN THE ACCURACY OF MEASUREMENTS OBTAINED
FROM SYSTEM PHOTOGRAPHY, DESIGNED TO PROVIDE TECHNICAL
INTELLIGENCE, HAS BEEN REDUCED DUE TO THE LACK OF ACCURATE
ATTITUDE DATA.
T O P S E C R E T
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