TRIP REPORT - NOISE MODULATED (SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A004100060008-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: July 31, 2012
• Sequence Number: 8
• Publication Date: February 13, 1959
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2012/07/31 :CIA-RDP78-03330A004100060008-8
STANDAR
FOR
B4 ~
D
M NO.
CO~VF~? ~`_
0 ce Meynor~ndu~ ? UNITED ~E~~GOVERNMENT
gating in discussions concerning this program were:
1. On 3 February 1959 a visit was made to
DeTE: 13 February 1959
to monitor t o ontract
RD-1 ,Task Order 7, Study for Noise Modulated Partici-
2. ~~ reported that much of the study had been completed
and that he hoped to finish the final report on this program by 15 March.
Many sections had been written, and the remaining portions, most of
which deal with packaging considerations will be written in conjunction
with the design engineers at After a
review by us, the report will be printed and published early in April.
3. ~~ described in. detail th n method that
is recommending for the noise modulated The contractor
Trip Report = Noise Modulated
is suggesting that a generated reference signal be used, provided by
a feedback shift register. This reference signal will have a very
short repeat time, in the order of 100 milliseconds. A 100 microsecond
pulse will be the basic signal unit and a code of about 100 of them
will be used for each 10 millisecond mark or space signal. The contractor
ruled out the use of filter pairs since heavy equip?~ent would be needed
at the transmitter. He also excluded the use of a recorded reference
because the mechanical stabilitlr of recorders is not adequate. A
transmitted reference is not recommended since the need to provide two
virtually parallel channels, one for information and the other for
reference, is felt to be altogether too cumbersome.
~+. A modified matched filter may be used at the base station,
instead of to provide protection against multi-
path energy losses. s mp ied search procedure will be possible if
peak energy alone is to be recovered. Preliminary calculations indicate
that only a 5 to 10 db loss is suffered if peak signals alone are used.
said that the anticipated multipath problem might rule out the
frequencies for daytime operation be avoided.
use of this set on double 3iieop circuits, and he recommended that law
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~~ Declassified in Part - Sanitized Copy Approved for Release 2012/07/31 :CIA-RDP78-03330A004100060008-8
 Declassified in Part - Sanitized Copy Approved for Release 2012/07/31 :CIA-RDP78-03330A004100060008-8
5. ~~has made little progress on an advanced storage
medium aad is recommending a simple tape loop to store the 500 characters
of our message. The output of this tapes however instead of keying
the transmitter direct; goes into a single-character shift register and
is readout at a constant rates so that inaccuracies due to tape wow
and flutter are eliminated. If the tape fails to fill the shift register
in time for transmission of a new characters a blank is transmitted
while the tape catches up with the shift register. asked to
discontinue its work on the coders since it had gone as ar as it could
and was considering a subcontract to a computer firm. O was
asked to devote his remaining effort to modulation and packaging
considerations.
CON F~ DE~o~L ~?f
sounds like continuous noise.
analysis oY such a system and asked if
and asked for their comments and reaction to it. It is a simple approach
in which purely random noise is transmitted for "space" and modulated
noise, from the same random source, is used as "mark".. Modulation
consists merely in ma~danizing the third moment of the random noise sign
in order to permit a special]y equipped base station to differentiate
between mark and space signals. To an ordinary receivers the signal
outlined a new noise modulation technique tq'
has completed preliminary
would be interested in
said they could see
g
no obvious shortcoming in a ec que d to look into it.
the work.
continuin
said that sufficient excess funds would be available within
Task Order 7 to allow an active pursuit of this problem.
Distribution:
R+D Subject File
Monthly Report (2)
R+D Lab
C?~FI?F~
Declassified in Part - Sanitized Copy Approved for Release 2012/07/31 :CIA-RDP78-03330A004100060008-8