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Fundamental TechnologiesCassini MIMI Pages |
INCA PHA Events
16 PHA ranges (4 TOFs x 4 masses: H, He, [C,N,O], and Heavies)
For each event 2.5 16-bit words--> 40 bits:
| PHF: | 6 bits (6 MSB of the sum of 2 8-bit words) |
| PHR: | 6 bits (6 MSB of the sum of 3 8-bit words) |
| TOF: | 10 bits |
| Azimuth: | 6 bits |
| Elevation: | 6 bits |
| Coincidence: | 1 bit |
| Start & Stop: | 1 bit |
| Range: | 4 bits |
Organized on the basis of: 6 PHA events x 16 ranges x 40 bits/event
--> 3840 bits
(6 PHA events/range on the average, out of 24 available --> 2304 bytes alloc. mem.)
transmitted every 4 subsectors (21.56 s for nominal Pspin)
:
178.2 bits/s
Note: Eventual variations of the s/c rotation period during Spinning Mode will be taken into account by adjusting the 6 PHA events/range number, so as to maintain an approximately constant bit rate for INCA (per T/M mode).
INCA Accumulator Rates
8 accumulators (24 bits --> 12 bits log compressed each)
transmitted every subsector (5.391 s for nominal Pspin)
:
17.8 bits/s
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Updated 6/17/08, T. Hunt-Ward
tizby@ftecs.com