Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

MQT > Subsystems > Flashcards

Subsystems Flashcards

1
Q

Determines Yaw

A

IIR - CSS
IIF - ASD
III - SSA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Determines Roll & Pitch

A

IIR - ESS
IIF - STES
III - ESA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Use during L/EO

A

IIR - FSS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Measures rates

A

IIR - RMA
IIF - RGP
III - IMU

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Actuators

A

IIR - MTC
IIF - EMA
III - MTR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Nominal mode

A

IIR - SNP
IIF - 3A
III - Normal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Lost earth

A

IIR - SSH
IIF - SSA
III - SAM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Found sun/looking for earth

A

IIR - SHES/EAH
IIF - ESA
III - EAM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Use for Delta-V

A

IIR - SK/EHYS
IIF - SK
III- OA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Launch

A

IIR - Rate nulling
IIF - INIT
III - Standby

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

RW for
Roll
Pitch
Yaw

A

1 +3 Roll
2 + 4 Pitch
All

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Batteries

A

IIR - 40 Amp Nickel Hydrogen, no memory effect, no reconditioning. Bus operates at 28.4V

IIF - 40 Amp Nickel Hydrogen, uses battery system cycling (BSC). Bus operates at 28.4V

III - 70 Amp Nickel Hydrogen. Bus operates at 70V, payload and frequency stdrs at 28.28V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Solar Arrays

A

IIR - SAD controlled by ADE by sending cmds to SPU

IIF - SADA

III - SAWA controlled by the SADA. TFU protects SV electronics against hostile threats and EM disturbances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

EPS Regulation

A

IIR - PRU regulates at 28.4V with modes: Shunt- batteries full, Charge- batteries charging, Discharge- batteries in use during eclipse. PMS in the SPU controls EPS, ADE send cmds to control SADs

IIF - PRE, PCU- regulates distributes, controls power. SDA - dissipate excess power

III - SPRU- regulates voltage during sunlight SAS shuts off SA circuits

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Loadshedding

A

To preserve the SV integrity, systems are powered down.

IIR - determined by the AHD
Level 1 &2 - powers down systems but NAV stays on
Level 3 - powers down all but SV critical systems

IIF - 25 min timer: initiates when SV generating power and discharging (in/out eclipse)
70 Min timer: initiates when batteries are discharging
Level 1 - powers down all non-essential systems except RCS/TCS
Level 2 - powers down all non-essential, SV in sun search, SA at 90 degrees, performs SCP swap

III - Level 1: stops all maneuvers, charges battery at 18Amps, yellow SOH
Level 2: off all non-essetial components, red SOH, SV in sun search. Level 3: turns off GBD, MDU, clock RWA, SA at ideal charging, switches to thruster attitude control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

TTC Modes

A

IIR - ATO- s tones received. CTO - S tones and command. COM - everything is on

III - Normal: day to day mode, analog TLM from all NAV, bus, hosted, antenna. Auxiliary: when selective data on a components is required. Memory Dump: dump stored data from OBC, every contact 1 &2, 3rd

17
Q

UPLINK

A

IIR - Antenna - receiver - CDU - KIR (decrypts) - PCE (payload control electronics)

IIF - antenna - RF assembly - Transponder/cardholder (decrypts) - SCP - (NAV to NDU, everything else to RMU remote Multiplexer Unit)

III UPLINK/DOWNLINK 
Cardholder - decrypts
Belshazzar - encrypts
UDU - both sides ON, provides TLM, emerg TLM, routes SCCs
OBC - RIU - SUT - 1553 Bus/payload
18
Q

SPU

A

Spacecraft Processing Unit - HOT 2 sides always on
ROM - permanent copy of FSW non-volatile
RAM - FSW with upgrades volatile

SOFTWARE
Watchdog monitor - controls REDMAN, swaps components as needed
AHD is -5 coming out of eclipse, SPU takes cmd
CMD link priority
1. S-band CNTRL U1
2. S-band CNTRL U2
3. SPU A CNTRL SA
4. SPU B CNTRL SB

CV error: 42 sec timers when processing cmd, all other links blocked out

19
Q

SCP

A

Software Processor
UPLINK Modes
Authenticated CMD - SV performs software and hardware checks
Unauthenticated CMD - NAV only ground must cmd

DOWNLINK Modes
Format 1 - TLM
Format 2 - dump/dwell

Types of Commands
Real time cmd
Store time tagged - up to 200, 16 at a time
Cross link cmd - from SCP to NDU
Software executed cmd

Watchdog timer - resets SCP at the end of every processing cycle (1/64 sec), after 4 sec, forces same side reboot of SCP

Keep Alive Timer - after 12 sec, forces SCP switch

20
Q

OBC

A

Onboard Computer
SRAM - main memory, preserved by OBC hard reset
BOOTSTRAP and Operational FSW - crew can dump operational FSW to support anomaly investigation

STATUS
MEOK - OBC functioning well
NOT MEOK - by watchdog timer, direct FSW cmd, OBC power on reset, hardware reset
REDMAN - corrects failures

UPLINK COMMANDING
SCC - by UDU, allows configuration of critical components in case OBC is off
Bus link cmd - from ground

DOWNLINK TLM
Normal, Auxiliary, Memory Dump

SV SOH FLAGS
G - fully operational
Y - anomaly detected, SV msn capable
A - anomaly detected, SV status cannot be determined
R - anomaly detected, SV cannot return to operational status

Rolling Buffer - records time-stamped defined set of FSW variables, for anomaly resolution

21
Q

Propellant/Preassurant

A

IIR - 2 tanks Liquid Hydrazine, P: Gaseous Helium

IIF - 2 tanks Liquid Hydrazine, P: Gaseous Nitrogen

III - 1 tank Diimide N2H2; Oxidizer: N2O4. P: GHe

22
Q

Valves

A

IIR - LVA configures RCS, isolates propellant in case of leaks (4)

IIF - 2 latch valves

23
Q

Thrusters

A

IIR - 12x 0.2lbf
4x 5lbf

IIF - 12x 1lbf
4x 5lbf

III - 12x 0.2 lbf
6x 5 lbf
LAE 1x 103lbf

24
Q

TCS maintain temperature limits by

A

Active - Heaters (batteries, payload), temperature sensor, thermostat OBC heater in Block III
Passive - thermal boublers, battery radiators, insulation blankets, coatings, optical solar reflectors, heat pipes

25
Q

PSS

A

Propellant Subsystem
On-orbit propulsion, attitude control, SV disposal, SK

Thrusters split into redundant half systems, using isolating latching valves, allow the full propellant to be used by either side

26
Q

Forms of Heat

A

Internal - requires dissipation

External - Sun

27
Q

Forms of heat transfer

A

Convection - N/A via fluid
Conduction - transfer of heat between 2 parts in direct contact
Radiation - energy emitted by one body and absorbed by another through a medium or space

28
Q

III NCE

A

NSS Network Subsystem - 2 TCUs and FSW, controls payload 1553Bus, collects TLM, maintains SV timing if NAV payload is offline

TCU - 2 always on, distributes cmds, collects TLM

UDU - generates emergency TLM

MQT (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions