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

 

CDS-EPD Interface Description

 


 

Table 10. EPD Telemetry Mode Definition Block Descriptions

 

Address Range, hex # of Bytes Description
   Record Mode
1800-1826 39 S/W Patch Hooks
1827-1865 63 Accum. Service Table
1866 1 TLM Mode (=1)
1800-1866 103 Total
   Real-Time Mode Map 1
1800-1826 39 S/W Patch Hooks
1827-1857 49 Accum. Service Table (Map1)
1858 1 MapID (=0)
1859-1865 13 Filler (zeroes)
1866 1 TLM Mode (=2)
1800-1866 103 Total
   Real-Time Mode Map 2
1800-1826 39 S/W Patch Hooks
1827-1857 49 Accum. Service Table (Map2)
1858 1 MapID (=1)
1859-1865 13 Filler (zeroes)
1866 1 TLM Mode (=2)
1800-1866 103 Total

 

Table 11. Bus Transactions for Version3 Software Implementation

 

Item Description Transfer Period RTI  Source
Address
Destin. Address Size (bytes)
AACS Spin Rotor Vector once every minor frame 8 CDS EPD-2000H 6
First RT TLM Packet (header, 42 accumulator values) once every minor frame 3 EPD-2006H CDS 127
Second RT TLM Packet (6 accumulator values, HV monitor value (1 byte),  Science Record Array (5  bytes Hskpg/Status + 60 bytes CMS PHA (30 are filler in Map1) once every minor frame 3 EPD-2085H CDS 84 (only 54 bytes used in Map1
New Science Record Flag beginning every science record ** 6* CDS EPD-1867H 1
Telemetry Mode Definition Block (includes S/W patch hooks, Accumulator Service Table, MapID, and TLM_Mode_ID every mode change)   6* CDS EPD-1800H 39

 

Notes: * RTI has not been finalized yet. The EPD GSE has been using RTI 6 for testing purposes. The RTI must be either 0, 2, 4, or 6.
** The new science flag in the EPD memory is set by the CDS and cleared by the EPD processor after it is read.

 

 

Next: CDS-Produced EPD Telemetry Record 

 

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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.