Global Positioning System Reference
In-Depth Information
UHF antenna
and elements
L-band
antenna element
Interpanel
hinges
Solar
array
(stowed)
Antenna
Antenna
Solar
array
substrate
Access
panels
Spacecraft
processing
unit
High-band
antenna
(stowed)
Reaction whee
l
electronics
S-band
antenna
Reserve
auxiliary
payload
Battery 1
(17 cells)
−
Y
Rate measurement
assembly
+X
Earth sensor
assembly
Shunt
boom
assembly
Primary
structure
Mechanical
reaction wheel
assembly
Fine sun
sensor
Propellant
tank
Encryption/
decryption
devices
Magnetic
torquer
coil (roll)
Battery 2
(17 cells)
Solar array drive
Telemetry
interface unit
Command
decoder
unit
Solar array cells
L3 high
power amplifier
L1/L2 synthesizer
S-band
transmit/
receive
Magnetic
torquer
coil (pitch)
WGMIC
Rocket engine
assembly
L3 box
L2
transmitter
Ordnance controller (2)
Rubidium
clocks (3)
Low-band
antenna
(stowed)
Triplexer
L1 transmitter
Access
panels
Apogee
kick motor
Mission data unit
Crosslink transponder
and data unit
Payload
control electronics
+Y
−
X
Coarse sun sensor
Figure 3.11
Block IIR-M expanded view. (
Source:
Lockheed Martin Corp. Reprinted with permission.)
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