Spacecraft Power Budget

The table below shows a recent power budget for the Ulysses spacecraft; this power budget was last updated on 23 January 2002. Note that the spacecraft passes through many different configurations during an operational cycle (equivalent to 1 day), and some of these are autonomous. The power budget represents the worst case (i.e. minimum power margin) case in the current set of operational configurations.

Platform Units
Unit Power (W)
Power and Thermal Subsystem
Power Subsystem basic
Hot Case Heater
Cold Case Heater
+X Wing Heater
-X Wing Heater
Longeron Heater
100W External Power Dumper
50W EPD
40W EPD
20W EPD
10W EPD
7.8
8.9
24.9
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Power and Thermal Total 41.6
Data Handling Subsystem
DHS Chain 1
DSU 
13.8
3.5
Data Handling Subsystem Total 17.3
Telemetry, Tracking, and Command
Decoder basic
Receivers
RFDU
Transmitter 1
Transmitter 2 X-band
TWTA 2, EPC2
3.3
3.5
0.8
0.0
7.6
63.0
TTC Subsystem Total 78.2
Attitude & Orbit Control Subsystem
AOCS converter
Processing Electronics
Sun Sensors
Control Electronics
3.3
3.9
0.7
0.3
AOCS Subsystem Total 8.2
Payload Units
Unit Status Power (W)
Payload (via Main Switch)
SWOOPS/BAM-E
SWOOPS/BAM-I
SWICS/GLG
DUST/GRU
VHM/HED-1
FGM/HED-2
GRB/HUS
EPAC/KEP
GAS/KEP
HI-SCALE/LAN
COSPIN/SIM
URAP/STO
Heaters (via Main Switch)
SWICS/GLG2A heaters
DUST/GRU-2 heater 1
URAP/STO-6, Search Coil heater
on
on
on
on
on
on
on
on
on
on
on
on

all on
on
on
2.5
2.9
3.8
2.1
2.2
2.9
2.6
3.5
0.6
3.8
14.6
10.0

0.0
0.8
0.0
Main Switch Total   52.3
Experiment Heaters
SWICS compensation heater
SWICS Bakeout heater
DUST/GRU 2 heater 2
VHM/HED-4 heater
GRB/HUS heater
HI-SCALE compensation heater
HI-SCALE heaters
HI-SCALE Spiral Motor heater
COSPIN/SIM-2 heater
off
on
on
on
on
off
on
off
off
0.0
0.0
0.8
1.1
2.2
0.0
0.0
0.0
0.0
Experiment Heater Total   4.1
Spacecraft Platform total 145.0
Spacecraft Payload total 56.4
Total fixed loads 201.7

 
 
 

 

Variable Loads
  Decoding Not Decoding
Catbeds off Catbeds on Catbeds off Catbeds on
DSU off +1.9 +7.5 -3.5 +2.1
DSU standby +5.4 +11.0 +0.0 +5.6
DSU playback +11.9 +17.5 +6.5 +12.1
DSU record +11.8 +17.4 +6.4 +12.0

Spacecraft Peak Power:     207.9 W
Approximate RTG Power:   216  W
Current Power Margin:          ~8 W