OBJECTIVE: 

Approved for Release: 2017/08/17 C05099758 

MISSION 7161 

(bvIDLTI-GROUP 1) 

To locate ground emitters by intercepting ground signal emissions, analyzing 

and recording certain critical characteristics ot these data whUe on orbit. This 

payload contains a digital recorder and a 6 me analOS data storage unit (DSU) for 

recording electronic emissions. The DSU will permtt fine grain measurement of 

specific signals of interest. These data are retneved by transmiesion in digital and 

wideband analog form via the d~ links upon: command. 

SYSTEM DESCRIPTION 

This payload is an electromc reconnaissance system that intercepts pulsed 

electronic emissions from groond radiations.. cleo r8 

are recorded on wideban.d recording Bystem.. time s 

and operating mode information, are complled periodically and :recorded on an AR-400 

tape recorder.. Emitter parameters f such as frequency. pulse repetition frequency. 

pulse width and pulse ampUtude are also recorded. The sig:na16 recorded on the wi~:", 

hand system (DSU) will be read ~, or trci.1lSmitted, to a ground station via-a narrow:" 

band VHF data link. . -.. - .. -----«,-.. -~.". 

Major Components: The Multi-Group payload corudstB of the follOWing eight 

major components: 

1. Antenna 

2. ReceiveI(B) 

3. Payload Control 

4. Data. Handler 

5. Tape Recorder(s) 

6. Vernier Location Module 

7. Wide Pulse RecOgnizer 

8. Predetectton Module 

1. Antennas. Two log-spiral antennas are used to cover the four frequency 

bands. One covers Bands 2 and 3 and is an umurlable structure of mylar and aluminum. 

It is stored in a hermetically sealed canister and mounted on the end of a 15 foot boom. 

The boom is extended after the vehicle is in orbit and the antenna is inflated shortly 

thereafter. 

The other antenna is a fixed cone covering Banda 4 and 5 which is exposed for 

use after nose cone separation. 

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Approved for Release: 2017/08/17 C05099758 

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The antenna radiation patterns develop a coverage cone by the diff~~wm System 

between the ampUtuCle of the signals received by the signal and inh.iliit antenna. pair. 

The size of the coverGge cooe angle is mainly influenced by (1) the sig'1181 and inhibit 

channel gain settin.gs, (2) the payload altitude and ground spe.;;:d. and (3) .is set to be 

consistent with the JScaImilng rates of the receiver. A cone angle of 30 degrees at 

275 N. mi. orbital altitude produces a circular coverage area. of 150 N. mi. diameter. 

2. Receivers: The frequency range of the multlgroup payl04d is 125 Me to 

2100 Mc andls divtdE!d into four receiver bands: Band 2 - 125 to 260 Mc. Baud 3 -

260 t() 530 Me, Band 4 - 530 tolD60 Me, and Band 5 ~ 1060 to 2100 Me. Each band 

utilizes a complete receiver consisting of an RF front end. an IF lvideo section, and 

an a.mplitude comparator. 

Sum and difference mode signals from the antenna forming the signal and inhibit 

channels. respectively. are amplified. mixed, amplified again, detected and routed to 

an amplitude comt-"arator. TIlE! amplitude comparator examines these signals for 

relative amplitude difference t and determines whether they came from an emitter 

within the desired circle of coverage. If so, an accept pulse is generat~d within the 

comparator and sent to the Data Handler (DR) and the signal is processed. An 1nband ~tacto:r inhibits the generation of an accept pulse for an off-channel response 

(those signals appearing from d~ed signals outside the IF passband). A discriminator 

receives the limited IF output from the sipl log IF amplifier and delivers a discrim .. 

illator video out(.)ut to the payload control (PLC). 

3. Payload Control (PLC),! The payload control cOrl.\lOnent receives interface 

commands and converts them into a form that provides the controls for payload 

operation. It provides: 

a~ Stol'age, interpretation, or distribution of nearly all interlace commands 

as necessary to control the payload in its various modes of operation. 

b. Recorder controls for the digital recorder. 

c. Protecl..ion to the analog recorder by proper voltage control to prevent 

destructton of the tape. 

d. Receiver scan voltage generation with back-up capability (the hack-up 

generator does not provide a quadrant select capability). \1, U . 

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e. Payload sequencing and scan controls. The bays are sequenced" 1, 2, 3, 4, 

1., /.;, 3, 4· t regardless of which receivers are located in the bays. Any bay disabled 

will not be included in the sequence, and no delay will be encountered in sCiamling 

through a disabled bay (any disabled quadrant or quadrants cannot be by-passed, 

however, \vithout some delay). C(lPY. .p.» 

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Approved for Release: 2017/08/17 C05099758 
Approved for Release: 2017/08/17 C05099758 

'fOP SECRET 

Handle via BYEMAN 

4. Data Handler (DH): The data handler receives. measures. ~lliib ~Yllitam 

stores the electrical description of the electromagnetic sigr:r.al detected by the payload. 

The following information 1s processed: 

a. Pulse Repetition interval (PRi). The PRJ circuit receives the accept pulses 

from the receiver, digitizes and stores the interval between them and determines the 

basic time for which the data handler operates on an input signal before generating a 

data word. 

b. Pulse Width (PW). The PW circuit receives. digitizes. and stores the PW 

information contained in the accept gate input to the data handler. This circuit 

digitizes PW's from 0.25 usee to 379.75 usee. 

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c. Pulse Amplitude (PA). The PA circuit digitizes and stores signal channel 

PA information from the receivers. This circ'llt digitizes PA's over a range of 52 db. 

d. Pulse Amplitude Difference (PAD). The PAD circuit measures. digitizes. 

and stores the PAD between the signal and inhibit amplitude gate inputs. The PAD 

compares and subtracts the inhibit pulse amplitude from the signal pulse amplitude 

when the pulses are coincident. If the inhibit amplitude gate width is greater than the 

signal amplitude gate width, the PAD circuit inputs are blanked since no accept pulses 

will be received by the data handler under this condition. 

e. Balld Code, Freq..1ency. an] Time are other characteristics that are processed 

through the data handler. 

The data handler also originates the record act:uate sir;nal through a record 

control circuit to the tape recorders after the electrical characteristics of the intercept 

have been analyzed and digitized in the data handler. 

This record control circuit synchronizes the proper operation for start-sto~\ 

words when either recorder is turned ON Or OFF and steers all forms of digital wor(;s 

to the proper recorder. 

5. Tape R.ecorders: The digital tape recorder records digital information in a 

start-stop fashion on magnetiC tape and. on command. plays back this inforrmtion 

continuously in either a forward or reverse direction. The tape recorder stores the 

processed digital data from the DH during an intercept. During readout. the stored 

data are read out to the DH for reprocessing. The following is a sumrmry of the 

digital tape recorder characteristics: 

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Approved for Release: 2017/08/17 C05099758 

3 
Approved for Release: 2017/08/17 C05099758 

Number of tracks 

Steady-state recordIng speed 

Steady-state readout speed 

Start time 

Record time 

Time beyond word 

Bit density 

Tape capadty 

Four (two for information .and ~p!fQ;r:' 

synchronization) \, ~t~~ t: ',; 

22.5 ips 

22.5 ips 

6.8 L 0.4 milliseconds 

9.6 I 0.5 milliSeconds 

3.3 7 0.3 milliseconds 

444 bits per inch (nominal) 

Sufficient for 6200 recorded words rninimum 

TIle Analog recorder records analog and digital information and operates in a 

steady state condition. On command, playback is obtained continUously in a reverse 

direction. with the lru!t recorded information being readout first • . Analog tape recorder characteristics: 

Recording time - 40 min. 

1:1 readin/readQut 6 Me pre-detection 

Number of channels - 1 video and 1 digital 

6. Vernier Location Module (VLlvO. The VLM is an add-·on moilule th8.t orc)vi~jes 

azimuthal iocation of emitte.rs within the 'cone of coverage. !t is designed to operate 

the anteIL"1aS for Bands 2. 3, 4, and 5. As a component, the VLM is concerned only with 

measuring the electrical phase difference angle between ce-ttain combinations of the 

conical spiral antenna windings so as to yield azImuthal location information. It samples 

the signal and inhibit channels in the receiver and measures the phase difference over a 

3600 range to within I 40°. The azimuth angle of incoming signals shall be coded in 1) bitS'. 

The VL,l\ii will be ON and operational whenever the payload is ON during readin and 

calibrate. 

7. v'lide Pulse RecoS!1izer (WPR). TheWPR is an add-on module that provide£: 

recognition of an emitter pulse greater than 75 usec with a sigruU channel input po¥.'er 

greater than - 65 dbm. It is designed to operate in the frequency range of 158-162 ~/;c. 

The digitized output is inserted in the payload digital data word as 1 identification bit. 

Each time a wide pulse in Lile specified frequency is received, the V'PR produces 

corn~aru:l outputs that stop receiver scanning, starts the data storage unit (DSlJ)fliDr 

recording the analog and digital signal outputs. The receiver resumes scanning after tHe 

target signal fades. The WPR will be e:nabled ON and OFF by rea.l-time commands . 

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Approved for Release: 2017/08/17 C05099758 

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8. Predetection Module (PDM). The predetectioll m 

add~on module that proces$~~\ and shapes received signals for a 

a:ecorcling before detection. It is designed to operate within all the receiver 

bands, PW's and aRI's. The PDM receives power and combined IF pulsel 

signals from. the VLM. However. the PDM and VLM :tncty be operated 

separately or Simultaneously because oltha!r interconnection wIth the PLe. 

The PDM will be turned ON a:nd OFF by real-time command. 

PAYLOAD CHARACTEIUSTICS 

Item 

Frequency range (Me) 

{Spec. limite) 

Bandwidth (Me) 

Scan time (nel"mal) (Sec.) 

(no intercepts) 

Scan time {Alternate 

rate} (Sec.) 

PRF'~ minimum (PPS) 

('Vii'! rHied) 

PRF, maxhnum 

MinimUll,:! PW (usee) 

M?.ximum PW (mace) 

Sensitivity (dbm) without 

antenna gain 

Antenna gain 

Ground coverage area 

(diameter) 

EJiCI,UDl'~D FROM AU1'O'!:iWIC 

DOn UtB. ~\?';')O.lO DO;:;S 

. 

12.5-2.60 

Z.O 

4.1 

16.4 

10 

10,000 

0.8 

3.8 

.. 75 

... 1.5 

(.- d 

Receiver Bands 

:3 -..¥ 

2.60 .. 530 !)30 .. 1060 

4.0 4.0 

4.1 4.1 

Ib.4 16.4 

10 10 

10~OOO 10,000 

0.5 0.3 

3.8 3.8 

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Approved for Release: 2017/08/17 C05099758 __ __ _ 

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1060-2.100 

5.0 

4.1 

16.4 

10 

10,000 

0.3 

3.8 

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The Agena will be launched by alShorad booster to a nominal -275 n 

mi 75° inclination circular orbit \rith a mission lifetime of ,30-60 days. 

The digital recorder will be prograrrnned on from border to border.. the analog 

recorder and payload modes will be pre-programmed for operation over specific 

locations according to COM OR guidelines, All data. will be dumped and recorded 

at ZI faciliti~s. The digital rnateria.l will be sent electronica~ to the 

processors and the analog data will be forwarded by courier. Location 

accuracies ,rill be + 35 n mi for one intercept and less for multiple 

intercept. 

The baste operating functions of the payload are readin, calibrate~ 

aLi readout. A simplified explanation of these operating conditions is 

given belou. 

Readin: '\tIith respect to receiver operation, the basic readin 

modes of operation are scan and lock-on. A payload command for these basic 

operating modes turns on power to the DR and PLC and starts the programmed 

receivers in their scanning sequence. Any combination of receivers can be 

selected for operation. A scan generator in the PLC programs each enabled 

receiver on a.s i te turn comes in the sequence. All receivers are scarmed 

from low to high frequency, and the receivers are scanned from Bay 1 

through Bay !+. 

Signal and inhibit untenna outputs are fed into separate receiving 

charmels having the same gain characteristics. An amplitude comparison is 

performed on the outputs of these two channels. w'hen the amplitude of the 

signal channel ~ceeds that of the inhibit channel by the desired amount, 

8.J.'1 identifying tag (accept gate) is generated that locates the signal (if 

the aJJ1plitade of the signal channel is not greater than the inhibit channel, 

a tag is not generated and the signal is not processed). 

Upon receipt of a signal from the coverage ~rea, an accept gate 

is generated within the receiver, initiating DB operation. The DH signals 

the PLC to stop the receival' scan for up to three more accept gates. At 

least two accept gates are required to generate a data word, although four 

are required for a complete word. If a aecond gate is not received within 

the maximum PRI for the band, the DH is reset, scan resumes~ and in the 

normal soan mode, no data word. is produced. When the fourth accept gate is 

received, the DH will have completed 3 PRI, 2 PW, 2 PA, PAD, f'reqt:ency and 

time measurements, and will transfer the data word to the recorders. The 

DH then initiates the actuate signals to the recorder that is programmed 

on. The timing at this point is a !.\met ion of the mode programmed and the 

reoorder being used. In the normal scan lUode, the scan rema.iru;I stopped 

only long enough to obtain up to four accept gates and generate a data 

word. In the lock-on mGde, the scan remains stopped for 10 second:;) to 

permit recording on the DSU, but da.ta word.e are generated. and can be 

recorded on the digital recorder. The number of data words recorded is 

limited to ten. 

Approved for Release: 2017/08/17 C05099758 
Approved for Release: 2017/08/17 C05099758 

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(1) the data \'lOrd just mentioned, wP..ich is genera.ted for each t:ime verified 

incoming signa.l wIthin the coverage area; (2) the start i'rord \'Ihich is 

generated when either tape recorder is turned on in a write mode 1 and 

the stop word "IDie}} is genera.ted as each recorder 1e turnoo off at the end 

of a write period; (3) the status word which is gen~rated betlieen the 

£'requ.ency act?Jl of Bay 4. and Bay 1 and (4) the :marker word which is 

generated and pelmt interpolation of a sigrl8.l 1 s frequency. If a. record 

signal should ~ received during the generation of a marY..er word, the data 

'VlOrd 'V'ull override the mru'ker word. 

iliLlibr,ate Mop.~: In the calibrate mode, known signals are 

'transrilittc;d to the payload and tl;e data are transmitted to a tracking 

station :in real time. Program 770 ASTROPHYSICJI..L RESEARCH VEHICLE's are 

utilized. to tranamit s:tgnals of known para:meters from pradete:rm1noo. sites 

inl3ide the Vandenburg area of tracking coverage to the payload. 

Readogt: In the readout mode, the filtored digital data and 

pert:lJ1ent payload monitor points in.fon:natlon ere transmitted to the stat·ion. ~'1nen the payload receives the digital readout comrn.,.'lUcl, the DIGITAL tape 

recol'de!' reads out the data in reveree order to the DR. The DH reprocesses 

the data for transmission by the comtt'lB.nd 13m control 8Ub$y5tem~ Transmission 

is a.utomatically stopped 'When front-o£-tape is reached. 

The ana~og recorder records on one side of the tape while the 

tape move$:~ne direction, end on the other side 'While the tape moves in 

the opposite direction. lIJhen the A.nalog Readout ON command is given, the 

recorclel' will read out in the reverse direction from which it reads in~ 

with the hst recorded. into:rmat.ion being read out first.. 

FROM AUTO\fA7 Ie 

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Approved for Release: 2017/08/17 C05099758 

MISSION 7229 

(SETTER IA) 

OBJECTIVE: The SETTER IA payload is an electronic reconnaissance system 

which locates ground-based S-Band emitters by making relative phase measurements on the received RF signal. The SETTER IA is capable of. working in 

dense signal environmenti6 using emitter frequency and geoposition as 

parameters for sorting the pulse trains. The payload processes and records 

the intercept information in digital form and converts the recorded information 

into a torm suitable for transmission to the ground. 

SYSTEM: SETTER IA is integrally mounted with the prime payload (in this 

case Mission 7161) on a fully stabilized AGENA vehicle. It is a 6 channel-90 

dbm sensitivity system using six circular horn antennas arranged in an 

interferometrlc array feeding six fluperh.eterodYne receivers each tuned in 

256 steps Z960.5 to 3215 Me with 1.5 mc bandwidth. The dwell time on each 

step is 2.5.42 maec to 100 msee depending on signal density. During this time 

the 1Z0 x 340 mi field ot view is scanned and the radio frequency $ pulse width 

and repetition interval of re'.eived pubes are d!gitized and stored. The SETTER 

data is recorded and dumped on the same type of 10 $ 000 bit/ Bec equipment as is 

the Mission 7161 data. Two 96 bit words are used for each intercept; 6550 

intercepts can be stored and the total dump time is only 165 sec. The SETTER 

tA payload has three fundamental functional modes of operation: a 

reconnaissance mode (read-int». and two real-Ume modes (readout. and 

calibrate and record). 

Read-In 

The readin or reconnaissance mode may be fUrther subdivided i.uto 

5 operational modes: The Dormal mode and 4 alternate mO<ies. In the normal 

mode, 4 successive pulses may be analyzed from the same emitter. but only 2 

are needed to coruirm the i t and print two descriptive 96 bit digttal 

words onto the asaoeiated tape recorder. All basic intercept 

paJ:ameters, together with other necessary data, are recorded in Z data words. 

The digital data. word contains 96 bits with a ,3 millisecond interword spaci ng. 

The nut data word contains parameters of th.e fiut two pulses, and the second 

data word contains parameters at the third and fourth pulses. In any operational 

mode, 2 start"stop words are generated at both the beginning and the end of an 

observation period. These words contain system time~ vehicle attitude, and 

paylo;ad operational confi.guration. Abo, Z Ume attitude words are generate« 

once every 16 seconds du:dng au observation period. The 4 alternate mode:'> are 

provided to permit: ;rtormance in the event of ce;;:~tain 

malluncUonlih All modes are t ' . . . 

EXCLUDED F'Rmf AUTm~ATrc 

Approved for Release: 2017/08/17 C05099758 

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Approved for Release: 2017/08/17 C05099758 

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Control SVS 

Normal Mode. The normal mode utilizes a Space Window co pt 

Qr sorting phase (geoposition) information of emitter signals for the logic 

decision to ppocess or reject. The normal mode permits de-interleavh'lg 

during a single dweH period. All of the following inhibit-confirm parameters 

are also analyzed in the normal mode of read .. in: 

a. Within phase field-ai-view (FOV) 

b. Real and not a spurious signal 

c. Amplitude within dynamic range 

d. PV; PW min (0.5 usec) 

~. Within frequency process hand of -::!::.. O. 75 Mc. 

Alternai~ Mode I. Alternate Mode I disables the intra-step 

core memt:.::y 30 that individual emitters may be repetitively processed 

during a fly-hy. but: only one emitter is processed per dwell period. The 

emitter is accepted or rejected in this mode on the basis of fLrst come, 

first serve. Subsequent pulses are compared to the first pulse for 

accepl.ance on the basis of DF information • 

• b,lternate M;:)de ll. Alternate Mode II disables the Space Window 

logic and processes Z pui;;;;-per amitter. The system immediately changes 

frequency after Z pulses per emitter are processed. (Four pulses aX'e 

processed in t he normal mode if SI pulses occur within the fequired time 

intervals.) Two emitte:rs operating at the same frequency but separated 

within the FOV may be processed as one emitter within a dwell period, 

since the absence of SW logic prevents emitter DF sorting. 

_~lternate Mode ill. In this mode, the following inhibit, frequency 

confirm. Tmin. and Tmax. The intra-step core memory and space window 

logic is maintained. 

Alternate Mode IV. Thi.s mode is the aarne as Alternate Mode II 

except the phase FOV in\lihh. function is removed. 

Readout 

In the readout mode, the data which was stored in NRZ .. Mark 

form is readout through the IBU to the data link in 3 level RZ code. The 

digital recorder 16 the same type alii that used with the 7161 payload. 

Calibrate and Record 

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Approved for Release: 2017/08/17 C05099758 

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Approved for Release: 2017/08/17 C05099758 

In the calibrate and relCord mode, known signal s are tr ;, 

to the payload and the digital data are transmitted to a tracking station in 

real-time at the same time the data are recorded. Program 770 Astro 

Physical Research .ehic1e's are utiU~ed to transmit signals of known 

parameters from predetermined sites imUde the Vandenberg area of tracking 

coverage to the payload. 

Location accuracy of SETTER is + 7.5 n roi on a single intercept 

with even increased confidence and mtnim!zedSystem errors p,ossible from 

multiple hits. Rf measurement accuracy is -j... 0.03%. pulse width 

quantiItation levels are 1.43_ 2.86. and 5.6Z~icrosec. pulse repetition 

interval is measured -/-15 microse.:: for p:ris 3'10 to 33,000 pps and pulse 

amplitude is measured"-" 2.5 dh over a 45 db dynamic range. - SETTER Ia is an advanced all-solid state system using electronically 

tuned frequency synthesized stripline receivers and a magnetic core data 

handler. 

~XPECTED LIFETIME,: 30-60 days. 

SCHEDVLED LAUNCH DATE: 19 Dec 1966 

Approved for Release: 2017/08/17 C05099758 

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Approved for Release: 2017/08/17 C05099758 

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SETTER IA PAYLOAD C.HARACTERISTICS 

Fl."equer.l.cy coverage 

Scan time (entire freq. rar.ge) 

Dwell time (Hme at one discrete 

frequency) 

Dynamic range (referenced to 

antenna inpuU) 

Pulse repetition interval 

PIU min. 

PRlmax. 

Pulse width (PW) 

Absolute pulse ampli~ude 

Space coverage 

DF Accuracy 

4' 

2960.5 .f- ~ Me. to 3215.5- -1-1 l ... 1:c - - 7. 02 -I- .5- sec. (no intercept} to 32 sec. 

{max:-dwell at each 1. Me 

25.4 rnx ...J-:t. 5- or lOO rna on 

weether anintereept is processed. 

-45 dbm to -90 dbm 

30.52 usee (32730 

23.5- milliaee 

0.75 PW 1.43 usee 

1.43 P'N Z. 86 usee 

2.86 PW 5.62 usee 

5.62 PW (no max. PVl 

Encoded in a 2.5 db increments, 7.5 

(bottom 

(. rectangle apprrudmately 120 n. m. wide 

and 340 n. m. long (at 275 n. m. alt.) 

(The width dimension i.s along. tne flight 

path) 

CPE of 1.50 (1/2 angle) cone about the 

line of sight to the emitter 

(Equtv. 1;00.6745 Co, ). 

Approved for Release: 2017/08/17 C05099758