Term
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Definition
DATA PROCESSING SUBSYSTEM
1. Housekeeping 7.Handles grnd commands
2. health data 8.dumping data & programs
3. storage 9.redundancy
4. management 10.thermal
5. SAFEMODE OPS 11.solar array
6. thruster control 12.NUDET & recovery |
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Term
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Definition
IOC - Input/Output Controller
MSP-PR1 - Milstar Sat Processer - Performance Range 1
MAP - Milstar Advanced Processer (Block2)
SME I/O - Safemode Electronics Input/Output
MMU-1 - Mass Memory Unit
RIU - Remote Interface Unit |
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Term
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Definition
Input Output Controller
like post office, gets commands and distributes.
Communicates with riu's, SME I/O, MSP-PR1/MAP |
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Term
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Definition
MIL SAT PROCESSOR - PERFORMANCE RANGE 1
MILSTAR ADVANCED PROCESSER
2 MSP's on block 1 sats, & MSP + MAP on block 2
CPU for space craft, Hardware platform, emp safe, dual redundancy |
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Term
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Definition
SAFEMODE ELECTRONICS INPUT/OUTPUT
Fully redundant microprocessor unit.
PRIMARY INTERFACE AND CONTROL COMPONENT OF DPS
Control stabilization and control subsystems
FSSA positioning and control
Temp comtrol, MSP health check
function during safemode, block II support during safemode,
batt charge control, event handling
MSP alternate load path |
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Term
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Definition
Mass Memory Unit-1
Like external hard drive and has reload programs installed. |
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Term
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Definition
Remote Interface Unit
Provides the ground and MSP-PR1/MAP with means of controlling and receiving telemetry from components on satellite.
SME I/O = RIU 4
RIU1,2,3,5,6,7 throughout the space craft.
RIU gets 4 types of telem data - bi level, serial digital, thermistor, analog. |
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Term
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Definition
Telemetry, tracking, and commanding
Comm link between sat com center on grnd and milstar.
Xmit and Receive, Modulate and demodulate.
Detect and convert signal to terary signals.
decrypts & authenticates received commands
encrypts from DPS to send out.
A & B
Hybrid Coupler - Diplexer - receiver - decrypt - authenticate - to IOC
IOC to encrypter - xmitter - diplexer - hybrid coupler out. |
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Term
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Definition
2 S band antennas - collect and emit SGLS RF waves
SGLS = Space Ground Link System
RF Hybrid Coupler
Diplexers
Decryptors
Authenticators
Decryptor/Authenticator Pairs
Encryptor
Transmitter
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Term
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Definition
| Couples transmission, passes to diplexers. |
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Term
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Definition
| Passive RF Filters allow for receipt and transmission of signals between transponder and hybrid coupler. |
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Term
| Decrypter / Authenticator Pairs |
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Definition
| Receives encrypted data from receiver from 4 lines and outputs one plain text data into authenticator. |
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Term
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Definition
| The encryptor receives plain text unencrypted telemetry and ....encrypts it. |
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Term
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Definition
ELECTRICAL POWER DISTRIBUTION SYSTEM
Provides all power needed by the satellite during eclipse and non eclipse periods.
EPDS used by TCS and APS for commanding and telemetry collection.
Power - Generation, Storage, Regulation, & Distribution
Make it keep it use wisley and share. |
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Term
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Definition
FSSA
PIU/SADE
PCDU's
Batteries
BRU |
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Term
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Definition
Solar array +/- Y axis
Provide full and trickle charge of batteries
FSSA provides primary power. |
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Term
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Definition
Power Interface Unit / Solar array drive electronics
Provide interface between SME and PCDU
SME-------PIU/SADE-------PCDU
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Term
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Definition
Power Control and Distribution Unit
Porvides single power bus for spacecraft. Fused power to bus, unfused power to PIU's SADE and Pyrotechnic control unit.
Single ground point for all power sources. |
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Term
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Definition
| NiH2 Nickel Hydrogen. 4ea |
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Term
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Definition
Bus Regulator Unit
provides regulated 33.7V in sunlight, routes power to PCDU
Inactive during eclipse |
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Term
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Definition
Thermal Control Subsystem
maintains satellites thermal environment
Retains heat
generates heat
removal transportation of heat
dispersion of heat.
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Term
TCS
Major Components
Active |
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Definition
TCS Active Major Components
1. Thermistor - Temp sensing device
2. Heater strip - like defrosters
3. Thermostat - temp sensitive switch on/off
4. HSU(Heater switch unit) - switch power to heaters
1degree under to 5degrees over set temp. |
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Term
TCS
Major Components
Passive |
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Definition
TCS Passive Major Components
1. Heat Pipes - pipe fluid shit
2. OSR Optical solar reflector - mirror
3. Multilayer insulation - gold foil
4. Sun Shades - like aunings
5. Paint - absorbs and reflects
6. Fibrous refractory composite Insulation - frici tiles rf
transparent. |
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Term
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Definition
Stabilization and Control Subsystem
1. Attitude determination and control.
2. Solar aray pointing and control.
3. Crosslink/spot beam antenna pointing.
4. 3 axis stabilization, earth pointing.
5. Commands APS to correct attitude.
WACS & TACS
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Term
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Definition
IRU - intertial reference unit
PNOHS - Precision NUll Operation Horizon Sensor
RWA - Reaction Wheel Assemblies
TAAA - Three Axis Accelerometer Assembly
WASS wide angle sun sensor
DSS - Digital Sun Sensor |
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Term
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Definition
Inertial Reference Unit
2 angular rate sensing units
each 2degrees of freedom gyros
gyro flywheel motor magnetic torquer, pickoff.
gyros 90degrees apart. |
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Term
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Definition
Precision Null Operation Horizon Sensor
dual scanning IR device operated in Earth pointing modes.
Scans for the 8Hz and atmospheric CO2 |
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Term
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Definition
Reaction Wheel Assembly
two direction angular movement for use in the scs |
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Term
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Definition
Three Axis Accellerometer Assembly
A single TAAA located on milstar Block 1
3 Accelerometers - pendulum, gap sensors, temp sensitive .5degrees of target temp.
only used for repositioning not station keeping |
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Term
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Definition
Auxillary Power System
provides control forces for attitude adjustment
used for back up 3 axis control
control forces for reaction wheel desaturation.
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Term
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Definition
PTA's - propellant tank assys
PIV's - Propellant isolation vales
RCTM - reaction control thruster modules
Venturi Reducer |
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Term
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Definition
PTA - propellant tank assys
PIV's - Propellant isolation valves
RCTM - Reaction Control Thruster Module
Venturi Reducer - like a hose nozle to boot velocity |
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Term
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Definition
Propellant tank assembly
79.82 gallons 10.67 cubic feet |
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Term
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Definition
Propellant Isolation Valves
Isolates OX and Fuel from thrusters |
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Term
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Definition
Reaction Control Thruster Modules
"thruster"
provides force for repositioning |
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Term
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Definition
EHF
Comm user uplink
Dehops spatial discrimination
*44.5 Ghz* |
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Term
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Definition
5 Agile Beam Antennas
1 Wide Spot Beam Antenna
2 Narrow Spot Beam Antennas
1 EHF Earth Coverage Antenna
down converter
transfer switches
intermediate frequency (IF) receivers
RFSU Radio Frequency Switch Unit |
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Term
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Definition
5 with 37 horns
controlled from TIU in the PMS |
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Term
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Definition
| 2 39inch dishes 1degree fov |
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Term
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Definition
| 24'' dish fov 1.7 degrees |
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Term
| ehf earth coverage antenna |
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Definition
| uplink reception from anywhere on earth, fov 17.8 |
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Term
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Definition
| 9 EHF downconverters receive uplink signals from their antenna DEHOPS and reduces frequency to IF |
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Term
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Definition
| 9 transfer switches between each down converter and IF Receiver |
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Term
| Intertmediate frequency (IF) receivers |
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Definition
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Term
| Radio Frequency Switch Unit (RFSU) |
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Definition
| 5 of the 9 channels pass through it |
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Term
| Surface Acoustical Wave (SAW) filter |
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Definition
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Term
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Definition
| puts supergroups into the PMS |
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Term
| Synthesizer Select Switch |
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Definition
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Term
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Definition
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Term
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Definition
§Functions
§Receive the EHF uplink signal
§Provides spatial discrimination
§Provides frequency discrimination
§Dehops/downconverts the uplink signal
§Forms supergroups |
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Term
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Definition
EHF Antennas
§Agile Beam (AB) Antennas
§Five uplink §Each divided into 37 feed horns §Controlled via the PMS TIU
§Turn on and off horns in less than one microsecond §Narrow Spot Beam Antenna §Two 39 inch dish reflectors §1 degree field of view
§Wide Spot Beam Antenna
§One 24 inch dish reflector §1.7 degree field of view
§Earth Coverage Antenna
§17.8 degree field of view §Low gain horn |
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Term
| EHF Major Components Cont |
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Definition
Downconverter
§Nine Downconverters receive the uplink signals from the nine EHF antennas
§Downconverts and dehops into an intermediate frequency
§High frequencies cause processing circuitry to perform poorly
§IF use improves frequency selectivity |
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Term
| EHF Major Components Cont |
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Definition
Transfer Switches
§Nine switches between the downconverters and the IF receivers
§Allows for routing from primary and redundant downconverters
§RF only flows from the active downconverters |
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Term
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Definition
§PMS controls the establishment of communications and the flow through the satellite
§Functions
§Routing and processing of communications messages for the Milstar Low Data Rate (LDR) payload
§Manages and assists terminals with acquisition and time tracking
§Network configuration and resource control
§Antenna Control
§Provides TRANSEC algorithms received from the CTS
§Handles terminal acquisition and fine timing
§Provides reportback acquisition and communication services
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Term
Space Ground Link Subsystem
(SGLS) |
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Definition
•Uses AFSCN to control Mistar
•Coordinates with 22 SOPS for AFSCN scheduling
•SOC 41 (Mod 13)
•SOC 42 (Mod 12) |
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Term
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Definition
•Prelaunch
–AFSCN/Satellite compatibility testing
•Launch
–Acquires satellite telemetry prior to Centaur (upper stage) separation
–Deployment of solar arrays, wings, & antenna
–Sun acquisition
–Earth acquisition
–Subsystem activation |
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Term
SGLS Functions
on orbit ops |
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Definition
–Early orbit checkout
•Hardware calibration/Subsystem unit performance assessment
–Housekeeping
•State of health
•Eclipse monitoring |
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Term
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Definition
•Anomaly Resolution
–Primary for satellite anomalies
–Real-time commanding
–TT&C for command and control |
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Term
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Definition
1. Pre Launch -
AFSCN/Satellite compatibility testing
2. Launch -
–Acquires satellite telemetry prior to Centaur (upper stage) separation
–Deployment of solar arrays, wings, & antenna
–Sun acquisition
–Earth acquisition
–Subsystem activation
3. On Orbit Operstions
-Early orbit checkout
–Housekeeping
4. Anomoly Resolution |
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