7.4 Design Methodology
237
Primary Image Process Board
Standby Image Process Board
Power Supply and
Distribution
Control Board
Secondary Power Board
On Board Computer A
On Board Computer B
On Board Computer C
Primary Power 29V
Telecommand Power 30V
Secondary Power
+5.5V
Secondary Power
+5V/±12V
Clock Arbitration Board
29V
Interaction Serial Port
for Triple-Modular
Computer
Telecommand
Other GNC Components
Power Supply 29V
Telecontrol Command
On Duty Signal/Control Period
128ms/Reset Signal
Health Signal
RS422
Separation Signal × 3
1553B Bus
Current Input× 30
Analog Telemetry Data
Synchronous Signal for IMU
Thrust Circuits× 34
P o w e r D i s t r i b u t o r
Control Command × 42
Components
On/Off Status
LVDS
LVDS
OBDH
Optical Image Sensor
3-D Laser Image Sensor
Power 6.2V
Optical Image Sensor
Touchdown Sensor
Shutdown Signal × 4
Gama Shutdown Sensor
Shutdown Signal × 3
Fig. 7.7 Block diagram of Central Control Unit
The secondary power module provided secondary power for the computer module
and the image processing module.
Power distribution module distributed primary power for each component of the
GNC subsystem, computers and image processing board.
The computers collected and processed the information of each sensor, controlled
the throttling engine and the attitude control thrusters, received and responded
the ground remote control information to GNC subsystem, and transmit the GNC
subsystem telemetry data to the ground.