CASSINI In Space

 

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GALILEO

The Galileo Energetic Particles Detector

 

Galileo EPD Handbook

 

Chapter 2. EPD Software

 

Energetic Particle Detector Experiment Flight Software System Documentation (continued)

Source: H. Malcom, July 30, 1982 

 

Scanning System Telemetry:

 

Closed-Loop Mode (Open Loop = 0)
Telemetry (TM) Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Byte 1 Scan Error* Aborted Fast Scan* Emergency Count* *Direction *Centerline

*                *                *
Position Code (XYZ)
Byte 2 Emergency Open Loop = 0 Modified Scan Fast Scan Go to Sec-tor "XYZ" X Y Z
Byte 3 Alternate Step Rate

CCW End-Sector Code

 Chicken Mode

CW End-Sector Code
Byte 4

 Number of Invalid Motor Commands
Byte 5 Spare Spare

Step Count

 Cease Scan*

Open-Loop Mode (Open Loop = 1)
Byte 1 Scan Error* Aborted Fast Scan* Emergency Count* *Direction *Centerline

*                *                *
Position Code (XYZ)
Byte 2 Emergency Open Loop = 1 Limited Scan Fast Scan Respond to "XYZ" Triggers X Y Z
Byte 3 Alternate Step Rate

Not Used
Byte 4

Number of Invalid Motor Commands
Byte 5 Spare Spare

Step Count

 Cease Scan*

 

*These bits are assumed to be sampled every 4/3 second. All other bits may be sampled once a minute.

 

 

Return to EPD Flight Software System Documentation table of contents page.

Return to Galileo EPD Handbook Table of Contents Page.

Return to main Galileo Table of Contents Page.
Return to Fundamental Technologies Home Page.

 


Updated 8/23/19, 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.