PROGRESS REPORT - 1/15/61 - 2/15/61 CONTRACT NO. AF 33(600)40280

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP67B00657R000200180036-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 29
• Document Creation Date: December 22, 2016
• Document Release Date: November 29, 2010
• Sequence Number: 36
• Publication Date: February 15, 1961
• Content Type: REPORT

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C1~llala NQ~ ifca'easo?F}~aS laoo9
C atm. A.CF o a
broaftftrd
of the frequency renerator w finished
9 The parts list does
be,
A (Vs ,t ariab1s' silicon
has been de rn-,1n wW proven f,
57"54 been as a
a o 1at ' c i18iti ity, of m*mr3,Y twice the
2 p tt Aes
oxima-tely 17 m*ks so
P~7
desip 'or
,n amore 10 M
c o s t , pp m -
The deed. and preli ,rg sti f of
f c(
available soon or a pro
Jitter is
broaftoard and
frequeray
e oscillator
the o i 1 tt des,
gh clock eq y amde,
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s
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V"W~ S-1 -IR -,
~ t VO
t airceits w
given to dremi'"
?et.
nv1,961
atty.
Wen proven saner*ot
thb
g tba
without vibr
The D.
A * lifter
which the geared
a "I,
made to rUVV
.n t model shop
r
o big
tar b ,
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was tla and checked
sq tincluding aWT p
by 2/24/610
lifter m . tic c
to the video fter for better it
t
S OM t ,, PAKUMSO
utilizing them has received tt most. atteatAan*
Frablms were encountered in attenuating the L.;
Ing. The frequewy-
mation of the
of tUs ett?
on. it was discontinued* the detector e
tput
n the desired r`
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;gnu, c trt3 a
pride t
deity: s bra
proper L p1itLd
we translators and four res:
tai
rwdsed quo
iot quo
been at t . A 6tetch
"" 40L
by 2/20/61. Approdn at
anaterm
A t tati e pa-to 316t
been c t i1eted.
A tantstive parts Ust
PI
0 to put four of
sfort ers y to t i h
quotos in
dr
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ontr .
Witioftl interlocks
on heater cent;
The R..' met be used on Vie m.`u
volta,,-'e. Them
design*
pr ng on the .2 tr r.
b 'Out i c;
inc
high
he fir lareadlycard in
*at
carrumic
have been rece1 o The ?`$ chaMiM
p+mr mVF1y and klyMtron head traM
-ut 2 nonthas Pendx ;
charging
n t modulator breadboard. Checkout of the try i
stability of the kly on and t ho invor diode operation can be c
substitutes a nd the, new emvone
received they can
losay Wired,, and dose not present a good short,
W. M u '
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sumed
(3)
th trigger voltage 4
(4
Voltage will decrease
They ~
h constant power in
the ICJ modulators
Pulse increases
h trig r voltage cInsta t, and RF tide
gap spaci f rim tim, increases 2
increased r2/6i to 5/64
Hold .. off of
x 2.5
Of vtpu
the TD25I
completed
pressurization essary for flOa
requested
plie concurrence a
urized t ration.
ht y veguid8 itch, and
$ due mainly to the high p
she
duple s cr
completed Whi
essary pressure
A tube as constructed in which a
tie triggering circuitrY and H.
asserabled
supply a
electrode Was inse
power supplies were
ger pulse,.. 'T'ie trigger p C
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witches just below the self-breakdown value
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EIEI
Rt ry. TA '
and 'chtng was
ttb
that thev as
rat outitum t
field.
Parts for this tube Its pu cb-cui
YAwiifold a. Tests m
Nnprm. 50 rk!)
wore rya
* CT
p $
5.
part will pro
tmiqtme;
fete desk
pr .. This wa,
useable as
l
low emt
give a riml cow : ti
5c. Eg
he ti M, Tee'
but with t
ut
will be as rem
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19?5's to 1O hAa been rade
Ct..
ala
Con deri .
for 11" .tit
A study to evaluate to *frosts of
Id
wi
4t a
o
would be r 4 to
project grt
a nt
ar the hotayip
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caning 'mat tears to be a
was nom:. The a p e started at
- t
no
c : are now appr
d f o r random t e ,
7; 500
to 0' tion f
of tho redesigned
)u .tz* t
upp
lity
configuration ` t o1:
completing a ,
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;b after t successful t t
,he prototq*, The,
to
of qtr, tthe 8 Ske b,,
a ,ye The costs of a
burniM !$d this mho cat' or m
been raftgiVv~d
3 sticks,
f 00'
due to b
plu
mputer run
usirkr. gabestof r=IMUX alk
thickness.
Toy stick** The, costs vthor,I ov to
difficultiorm of do..
to this report (Antenna Pattern - Effect of `h
f=` od..
Deflectiaw)
R?7
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the honeycomb tern (strA
Udakneso
byA of
. T mal aGing of
*t and ap te cht
be made
on cured b. 1 test zamlegip
osti atir 3 into " t wid
oat and amiW i t
.1 deli ca ppieti n beforp having nZ
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 ma 1w_ OV fte,
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WESTIN ELECTRIC CPORATION
CURVE
r
~
,- Ifi
,
i+
-
I
I
--~
-
- -
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I_
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INLH 1
111
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I
T
TIT
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Ar
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LU-
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p
al-
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L
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I
I
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r
IT
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L
I
~'
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lI
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RR I
I 1:
1r~" T
x
-1-,~ ,~ =1 rI
1P I-
II
j-
--
-~.--I-~
k
+
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{
T
T
=
t
_..
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ffl
r
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-
+
t
+
-1 T.
r art '
F
I
11 TTT~
1414-14- A
c Ln- u -1- r..- ,..
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on has disc1c awd. that a r,r fm y 100 1
4 i f the vertloal aperture r aced a
cr that this aould be co Utf +
made torn _.rt
fond
]tn chime
Theme considerations and conclusions can also apjZy to the prob.'
eats of skirt shape of the ante
o consider the timing
gees ton a io is w re re
35.4 to
a pate
20. it tan n that rein
Owl b 1: T
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d e o angle,, hover,, t
i9 inch
,get at 22.5 1
,lee, h
paid t use
mh antenna pattern is
n integration
Fusion drom from this is that no i fi t penalty it
F
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o bow due to differen
e rpana1 of the tvo faces of the honeycomb structure when a thermal gradient
exists across the honeyccxtb. This discussion attew
of allowable t "rature difference and heat
evaluate the problem
Neglecting a effects the differential ion will cau.
antenna
f` baw,, b in Ticure i can
(1)
Considering the detailed view of Figure 2, can writoe the relationsUp
between inner and outer face length as
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w
t t CRET
Substituting ..: ,. for L in (1) yields
substitution that can
the tber l expansion coeff cient,, L T. Thu
2
Substitu tiny L . 132 in
2.5 in, a ::.;.T
,t You is m145 WC -
bow due to thermal effects rakes b equal to
IOCS
Tr
difference of 8'C is allowable between faces..
allawa :s deflection .fr t :
and +
~ it
numerics.
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To relate this to heat flow, it is necessary to deduce a heat transfer
ent for honeycomb ma,teria ? The assumption made here is that heat trans-
a combination of conduction and radiation. in proportion to the relative
in the material,
computed from
1.
533
T + ,'P')
-
3 (')
37ex1014 T'+ (T)'+4TC,m,T
re ? is on the o
of the face plates caused by braising)
the order of
T -533*K 4? ,. 1.C and e - 0.2, (assumine am,
out to O* 8 watts/ in%*% a
The across section is the
Applyi these
0,00528 watts
es radiate 0?43 w{
otal is 0,,0 watts/ie' 'G. For 8,C, we have 0.0777 w:
allawaWo heat flow.
The conclusion reached is that the rate of hi
by suitable invulation , including insulated oonts;, to keep the
.thin toler ble lr te.
a conductivity of 15
wstts/in a.
call size 0.25 x 0 *251
(6 T)47
th 0,
,fore 1,2% metal
to the abt coed ctivit
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Weapons Systems Technical Memorandum No. 225
ANTENNA SIDE LOBE EFFECTS IN SIDE-LOOKING
DOPPLER RADARS
by
January 239 1961
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ABSTRACT
REPORT No. WLTM 225 DATE 1/23/61 PAGES 11
TITLE ANTENNA SIDE LOBE EFFECTS IN SIDE-LOOKING DOPPLER RADARS
CLASSIFICATION: REPORT Confidential ABSTRACT* Confidential
Expressions are developed relating antenna side
lobe structure to synthetic pattern structure in side-looking
doppler radars. The synthetic main beam appears quite insensi-
tive to antenna side lobes. Antenna side lobe power at angular
equivalents of prf harmonics is important and produces synthetic
pattern side lobes. These synthetic pattern side lobes have
magnitudes approximately equal to the square of the average
antenna side lobe level.
Side-Looking
Doppler Radar
Side-Lobes
AUTHORS
25X1
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Introduction
The objective of this calculation is to obtain an estimate of the
relation between physical antenna pattern structure and synthetic antenna .
pattern structure in a side-looking doppler radar. In particular, the effects
of antenna side lobes and sampling are of primary interest.
It is convenient to express all relevant quantities in terms of the
angle off the normal to the line of flight, ,(9 . This angle may be related to
the time variable by means of the relation
e = angle off the normal to vehicle line of flight
V = vehicle velocity
= range
'=time
The following notation is'adopted:
(e) = antenna gain pattern
~(?) = doppler pattern
Sib). sampling function
(1)
The signal received from a target moving through the beam will
simply be the'product of these three quantities. This product will be called
the aperture function and denoted by A(e )a
A(?) = C' CG) N) (19) S c13)
(2)
The function 8( e ) is periodic and can be represented by a Fourier series.
The doppler pattern, although not periodic, is oscillatory. Their product
has the form of a harmonic series. In the signal processing operation, it is
only the fundamental component of this series which is significant. This
fundamental component is denoted by A(?),
In the signal processing operation, the function A(9 )'is employed as an aper-
ture function in a coherent optical system. The power distribution in image
space or the synthetic gain pattern may be expressed 4s
Lc ?) W(G ') cK?c~-?', C9 1 (3)
CONFIDENTIAL
2
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\/81Mr500`n- ^ r I - ,`--~Idor-
An internally generated aperture weighting function., W( )8 is
employed which is matched to the main beam portion of the antenna pattern for
optimum performance. The constant Kl is adjusted to yield a maximum output
from one of the doppler components. We now proceed to the detailed specifica-
tion of the factors composing A"-) and the evaluation of the integral above.
The Doppler Pattern and Sampling Function
The doppler pattern will be of the following general form:
The sampling function is represented as a sequence of narrow sampling
pulses separated by the angular equivalent of the repetition period. A Fourier
series representation of such a function will be of the following form:
S (@) r.e, I +Z, coSZK6ae +2c-0s,$K0o@+ .. ,
The parameter ?o will have the following relation to the prfo fr
e0 -- v ~Sr
The product of D( 6 ) and S(@ ) will now be
(19) cocS(K 9 4c) + c-aS(,K(?-?gy,2 4(@~?-t ~~
Only the first three terms of this series will be of si
analysis. The aperture function., A((9 ),, is thus
(1 )
(5)
(6)
(7)
($)
C~1 C~ t,~)(eosl~c~a~~r)+ C?SCK(t3-??}'?-Ked) -.t.cocltck7~r?o)z (9)
CONFIDENTIAL
3
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The fundamental component is
G (G)c.cS(1~CC6+196)Z f\9e } 1) IZ6 ` & Z
A(.~~ r.. G te) (b ~ticez+ o
The synthetic antenna pattern can now be expressed in the following form
c ?
(10)
(U)
~o
T 0
Preliminary Evaluation
Taking the middle integral in equation (11) as an example,, the
product of the trigonometric and exponential factors may be expanded as
follows*. 1c C? - o
CIS?~ ~14~8t!4Cs l ' _jZ?eC a~,1S? - A
(12)
Because the argent of the first term contains K e;, , it will oscillate
rapidly with 49 and will contribute little to the integral. Onthe other hand.,
A1.7, C (9, (9 in the argument of the -second term will be very small for small
and the term itself will be approximately a constant. The same observation can
be made about the integrands of the other two integrals. On this basis' the
integrals will be simplified by dropping from consideration all exponential
factors with argants containing terms of the form ~7,1r\e
CONFIDENTIAL
IL
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e.
_+ (,WAAB 8%) e AG
in order to proceed farther, specific fqaaotioas must be assumed for the
antenna pattern. This will be done in the next section.
The Antenna Pattern
(13)
A variety of assumptions might be made for the antenna pattern.
In general, it is desired to assume a form for which the integrals above may
be evaluated and which also preserves the essential features of the real
situation. To this ends the following antenna pattern is adopted:
(1)
A main beam is assumed with a Gaussian shape. It will normally be
supposed that the beaniwidth is small compared to the angle
(2) A constant side lobe level is assumed without any lobe structure.
This assumed antenna pattern may be expressed as
G (9) e + oL
antenna beamwidth
off.- average side lobe level
The form of this antenna pattern is illustrated in fig re 1 for
of ? ?O1 , -/4.C1 Ab .
(14)
The antenna pattern adopted allows a relatively simple evaluation
of the integrals in equation (14)e The weighting function, W( ), is made
CONFIDENTIAL
5
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identical to the main beam portion of the antenna pattern. Because ?o is
appreciably larger than a beamwidth, the contribution of the main beam portion
of the antenna pattern may be neglected in the first and third integrals.
Similarly, because of the localized nature of the functions a( ? ) and W(?-
the integrals may be approximated by extending their limits to arbitrarily large
values. With these substitutions and modifications, equation (13) may be expressed
as follows: 1 00
e
PC?1)r.,
el _ ~ZK61e
a.Ka; ~~
?3&e ~x
CIO
klu'l) - ) gKe,?
CIL 6Pa AD
e cQe
Carrying o!at the indicated opp ?ations a
12
P(81)
t.~ x~ (