The Galileo Energetic Particles Detector
Galileo EPD Handbook
Chapter 2. EPD Software
New EPD Format and Implementation (continued)
Source: S. Jaskulek, May 11, 1993
TABLE 31. Rate Channel Assignments for EPD LEMMS Sensor; Channel Map 2
| Energy Range | Channel |
16 sec. +Cal |
6 sec. +Cal |
Omni +Cal |
Total Channels |
| LEMMS (MeV) | |||||
| 0.022-0.042 keV | A0 | 1 | 7 | ||
| 0.042-0.065 | A1 | 1 | 17 | ||
| 0.065-0.120 | A2 | 1 | 17 | ||
| 0.120-0.280 | A3 | 1 | 17 | ||
| 0.280-0.515 | A4 | 1 | 17 | ||
| 0.515-0.825 | A5 | 1 | 17 | ||
| 0.825-1.68 | A6 | 1 | 7 | ||
| 1.68-3.20 | A7 | 1 | 7 | ||
| 3.50-12.4 (Z>=2) | A8 | 1 | 7 | ||
| 0.015-0.029 | E0 | 1 | 7 | ||
| 0.029-0.042 | E1 | 1 | 17 | ||
| 0.042-0.055 | E2 | 1 | 7 | ||
| 0.055-0.093 | E3 | 1 | 7 | ||
| 0.093-0.188 | F0 | 1 | 7 | ||
| 0.174-0.304 | F1 | 1 | 7 | ||
| 0.304-0.527 | F2 | 1 | 17 | ||
| 0.527-0.884 | F3 | 1 | 7 | ||
| 3.20-10.1 (z=1) | B0 | 1 | 7 | ||
| 1.5-10.5 (e-) | B1 | 1 | 7 | ||
| 16.0-100 (z=2) | B2 | 1 | 7 | ||
| 14.5-33.5 (z>=1) | DC0 | 1 | 2 | ||
| 51-59 (z>=1) | DC1 | 1 | 2 | ||
| >=2.0 (e-) | DC2 | 1 | 2 | ||
| >=11 (e-) | DC3 | 1 | 2 | ||
| A singles | AS | 1 | 2 | ||
| B singles | BS | 1 | 7 | ||
| C singles | CS | 1 | 2 | ||
| D singles | DS | 1 | 2 | ||
| Background | EB1 | 1 | 7 | ||
| Background | EB2 | 1 | 2 | ||
| Background | FB1 | 1 | 7 | ||
| Background | FB2 | 1 | 2 | ||
| LEMMS Total | 7 | 16 | 9 | 249 | |
TABLE 32. Rate Channel Assignments for EPD CMS Sensor; Channel Map 2
| Energy Range | Channel |
16 sec. +Cal |
6 sec. +Cal |
Omni +Cal |
Total Channels |
| TOF x E (MeV) | |||||
| 0.08-0.22 (H) | TP1 | 1 | 17 | ||
| 0.22-0.54 (H) | TP2 | 1 | 17 | ||
| 0.54-1.25 (H) | TP3 | 1 | 7 | ||
| 0.027-0.155 (He) | TA1 | 1 | 17 | ||
| 0.155-1.0 (He) | TA2 | 1 | 7 | ||
| 0.012-0.026 (CNO) | TO1 | 1 | 17 | ||
| 0.026-0.051 (CNO) | TO2 | 1 | 17 | ||
| 0.051-0.112 (CNO) | TO3 | 1 | 17 | ||
| 0.112-0.562 (CNO) | TO4 | 1 | 7 | ||
| 0.016-0.030 (S) | TS1 | 1 | 17 | ||
| 0.030-0.062 (S) | TS2 | 1 | 17 | ||
| 0.062-0.31 (S) | TS3 | 1 | 7 | ||
| 0.02-0.20 (Fe) | TH1 | 1 | 7 | ||
| TAC Singles | TACS | 1 | 7 | ||
| KT Singles | KTS | 1 | 7 | ||
| Start Singles | STARTS | 1 | 17 | ||
| Delta E x E | |||||
| 0.19-0.49 (He) | CA1 | ||||
| 0.49-0.68 (He) | CA3 | ||||
| 0.68-1.4 (He) | CA4 | ||||
| 0.16-0.55 (CNO) | CM1 | ||||
| 0.55-1.1 (CNO) | CM3 | ||||
| 1.1-2.9 (CNO) | CM4 | ||||
| 2.9-10.7 (CNO) | CM5 | ||||
| 1.0-2.2 (Na) | CN0 | ||||
| 2.2-11.7 (Na) | CN1 | ||||
| 0.22-0.33 (Fe) | CH1 | ||||
| 0.33-0.67 (Fe) | CH3 | ||||
| 0.67-1.3 (Fe) | CH4 | ||||
| 1.3-15.0 (Fe) | CH5 | ||||
| Ja Singles | JAS | ||||
| Jb Singles | JBS | ||||
| K Singles | KS | ||||
| CMS Total | 9 | 7 | 202 | ||
| Total Channels | 16 | 23 | 9 | 451 | |
TABLE 33. EPD Science Record Format vs. Format Number
| Format Number | Telem. Alloc., bps |
Accum. Period Cycles |
Rate Channels |
Channel Map |
CMS PHA Events |
Hskpg/Status Bits |
Telem. Out, bps |
| 1,2,3,4,5 | 5 | 6 | 356 | 1 | 12 | 40 | 5.08 |
| 6,8 | 10 | 3 | 356 | 1 | 12 | 40 | 10.16 |
| 7 | 15 | 2 | 451 | 1 | 12 | 40 | 15.24 |
| 9,10 | 20 | 2 | 451 | 2 | 24 | 40 | 20.03 |
| 11 | 30 | 1 | 356 | 1 | 12 | 40 | 30.48 |
| 12 | 40 | 1 | 451 | 2 | 24 | 40 | 40.07 |
TABLE 34. EPD Rate Channel Packet
| Byte # | Description | ||||||||||
| 1 |
|
||||||||||
| 2,3,4 | Rate Channel 1 (24 bits) | ||||||||||
| 5,6,7 | Rate Channel 2 (24 bits) | ||||||||||
| 8,9,10 | Rate Channel 3 (24 bits) | ||||||||||
| ... | ... | ||||||||||
| 143,144,145 | Rate Channel 48 (24 bits) | ||||||||||
| 146 | HV Monitor Value | ||||||||||
| 147-151 | Housekeeping/Status | ||||||||||
| 152-211 | 12 PHA
events (20 bits each) and 30 bytes of filler or 24 PHA events (20 bits each) |
Once the data is retrieved by the CDS, it must sequentially go through the 24-bit rate channel values and add them to the proper rate channel bins defined in the CDS memory. The addition algorithm for this may be fairly simple (see Appendix A (of the EPD Sband Mission Software Requirements document) for more details), but determining which bin to address is not so straightforward. This task will be addressed in section 7 (of the Sband document).
The motor position, spin quadrant, and motor direction (in the science record status byte), all represent the values present during the quadrant that was just completed. In other words, the motor and spin parameters match up with the rate channel data that is also present in the data for that minor frame. One could expect, therefore, that in a minor frame data packet in which the "new spin flag" is set, the spin quadrant will equal "D."
Next: EPD SBand Mission Software Requirements
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Updated 8/23/19, Cameron Crane
QUICK FACTS
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.