CASSINI In Space

 

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GALILEO

The Galileo Energetic Particles Detector

 

Galileo EPD Handbook

 

Chapter 2. EPD Software

 

EPD SBAND Mission Software Requirements (continued)

Source: S. Jaskulek, various dates

 

EPD Memory Map

 


 

Table 16. Galileo EPD Subcommutated Housekeeping Functions

 

Position Retain Function
1 x Motor Housing Temperature
2 x Motor Telemetry Byte #1
3 x Motor Telemetry Byte #2
4 x Motor Telemetry Byte #3
5 x Autocalibrator Index #1
6 x Autocalibrator AGC Voltage #1
7 x Motor Telemetry Byte #4
8 x Motor Telemetry Byte #5
9 x LEMMS Telescope Temperature
10 x Number of Invalid Bus Commands (Modulo 256)
11   Autocalibrator Index #2
12   Autocalibrator AGC Voltage #2
13   Memory Dump Cursor (8 MSB)
14   Motor Dwell Period
15   CMS Telescope Temperature
16   Supervisory Data Parity Error Count
17   Autocalibrator Index #3
18   Autocalibrator AGC Voltage #3
19 x HV Command Level (and MSB of UM Checksum Limit)
20 x Subcom Control (and LSB of UM Checksum Limit)
21 x Main Electronics Temperature
22   Memory Checksum
23   Autocalibrator Index #4
24   Autocalibrator AGC Voltage #4
25 x HV Command Limit (and MSB of LM Checksum Limit)
26   Spare ["F0" Cmd] (and LSB of LM Checksum Limit)
27 x EPD Input Current
28   EPD Data Parity Error Count
29   Autocalibrator Index #5
30   Autocalibrator AGC Voltage #5
31   Spare
32   Spare
33 x +60 Volts Bias
34 x Power Switch Status Byte #1 (LEMMS pwr sw)
35   Autocalibrator Index #6
36   Autocalibrator AGC Voltage #6
37   Spare
38   Spare
39   Log Amp Temperature
40 x Power Switch status byte #2 (Gen. pwr sw)
41   Autocalibrator Index #7
42   Autocalibrator AGC Voltage #7
43   Spare
44   Spare
45 x -15 Volts Power
46 x Power Switch Status Byte #3 (Misc. Enables)
47   Autocalibrator Index #8
48   Autocalibrator AGC Voltage #8
49 x Upper Alarm Threshold for EPD Input Current
50 x Lower Alarm Threshold for EPD Input Current
51 x +10 Volts Power
52 x Power Switch Status Byte #4 (CMS pwr switches)
53   Autocalibrator Index #9
54   Autocalibrator AGC Voltage #9
55 x Upper Alarm Threshold for Motor Temperature
56 x Lower Alarm Threshold for Motor Temperature
57 x +6 Volts Power
58   PHA Control Byte (uncorrected)
59   Autocalibrator Index #10
60   Autocalibrator AGC Voltage #10
61 x LEMMS Telescope Temp. Upper Alarm Threshold
62 x LEMMS Telescope Temp. Lower Alarm Threshold
63 x +3 Volts Power
64 x Number of EPD commands executed (via S/W patch)
65   Autocalibrator Index #11
66   Autocalibrator AGC Voltage #11
67   CMS Telescope Temp. Upper Alarm Threshold
68   CMS Telescope Temp. Lower Alarm Threshold
69 x HV Monitor
70   Spare
71   Autocalibrator Index #12
72   Autocalibrator AGC Voltage #12
73 x Main Electronics Temp. Upper Alarm Threshold
74 x Main Electronics Temp. Lower Alarm Threshold
75 x -6 Volts Power
76   Spare
77   Autocalibrator Index #13
78   Autocalibrator AGC Voltage #13
79 x +10 Volts Power Upper Alarm Threshold
80 x +10 Volts Power Lower Alarm Threshold
81 x +10 Volts Power
82   Spare
83   Autocalibrator Index #14
84   Autocalibrator AGC Voltage #14
85   PHA Control Byte
86   Spare
87 x 5.12V Ref. Monitor
88 x Spare (previously HV Command Limit)
89 x Spare (previously HV Command Level)
90   Spare
91   Spare

 

 

Next: Appendix A. Buffer Storage for the EPD Rate Channel Bins 

 

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Updated 1/2/19, Cameron Crane

QUICK FACTS

Manufacturer: The Galileo Spacecraft was manufactured by the Jet Propulsion Laboratory, Messerschmitt-Bölkow-Blohm, General Electric, and the Hughes Aircraft Company.

Mission Duration: Galileo was planned to have a mission duration of around 8 years, but was kept in operation for 13 years, 11 months, and 3 days, until it was destroyed in a controlled impact with Jupiter on September 21, 2003.

Destination: Galileo's destination was Jupiter and its moons, which it orbitted for 7 years, 9 months, and 13 days.