Cassini MIMI Investigation at Fundamental Technologies

 Historical MIMI Memos and Notes

Telemetry Modes and Allocations

(S. Jaskulek, MIMI team meeting, October 1994)

LEMMS Turntable

1 rotation per sector (86.25 s for nominal Pspin)

LEMMS Accumulator Rates

64 accumulators (16 bits --> 10 bits log compressed each)

4 high rate accumulators transmitted every 2 microsectors,

i.e., every ~2.812º of t/t rotation (0.674 s for nominal Pspin
:
59.3 bits/s

60 low rate accumulators added internally in the DPU during 8 consecutive readouts,
i.e., every 22.5º of t/t rotation (5.391 s for nominal Pspin)
:
111.3 bits/s

LEMMS PHA Data

64 energy channels per detector x 3 detectors --> 192 channels
detector cycling: A,A,E,F
detector change every 2 microsectors
data added internally in the DPU during 4 consecutive subsectors
(for typical telemetry rate)
i.e., data accumulated over 90º of t/t rotation (21.562 s for nominal Pspin)
each channel 16 bits --> 8 bits log compressed
:
71.2 bits/s

(Data accumulated over 45º and 22.5º of t/t rotation for high and very high bit rates.)

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