II. Statistics Since the Start of the Current Epoch
Cold Time Statistics:
NOTICE!!!! We have switched to 6 month epochs!!! The epochs start on the following Days of the Year: 032, 213
The present targets for the Total and Cold times are:
Total time per SI Mode per measurement: 7600.0 seconds
Fraction of total time the measurement should be cold: 60.0%
| Stats | TE_007AC | TE_007AE | TE_00B26 |
|---|---|---|---|
| Total Exp. Cold Time (secs) | 82080 | 82080 | 82080 |
| Total Actual Cold Time (secs) | 19374 | 20677 | 27888 |
| Delta From Expected (secs) | -62705 | -61402 | -54191 |
| % of Exp. Cold Total (secs) | 23.60% | 25.19% | 33.98% |
| Stats | TE_007AC | TE_007AE | TE_00B26 |
|---|---|---|---|
| Total Expected Time (secs) | 136800 | 136800 | 136800 |
| Total Actual Time (secs) | 114350 | 111731 | 176229 |
| Delta From Expected (secs) | -22450 | -25069 | 39429 |
| % of Expected Total (secs) | 83.59% | 81.67% | 128.82% |
| SI Mode | Total Number of Obs. | Total Exposure Time (sec) | Average Exposure (sec/obs) | Primary 6 Chip SI Modes | TE_007AC | 16 | 114350.00 | 7146.88 |
|---|---|---|---|
| TE_007AE | 14 | 92297.00 | 6592.64 |
| TE_00B26 | 14 | 100256.00 | 7161.14 | Old 6 Chip SI Modes | TE_00216 | 0 | 0.00 | 0.00 |
| TE_0021C | 0 | 0.00 | 0.00 |
| TE_008EA | 0 | 0.00 | 0.00 | 5 Chip SI Modes | TE_00C60 | 5 | 46822.00 | 9364.40 |
| TE_00CA8 | 2 | 19434.00 | 9717.00 | 4 Chip SI Modes | TE_00C62 | 3 | 29151.00 | 9717.00 | Totals: | 54 | 402310.00 | 7450.19 |
Rule #1: The key time period for balancing SI mode statistics is the 6 month Epoch
By the end of the epoch, the SI mode statistics should match the rules stated below.
Rule #2: Each of the three, default, 6 chip, SI modes (or their 5 chip equivalents) must be used
at least once in each load week.
- If two SI modes are lagging in either cold time or total time, apportion the week's ECS
measurements between the two of them roughly commensurate with the amount they are lagging.
- The 6 month Epoch allows "even" correction of two lagging SI modes. No
need to pile a weeks worth of ECS measurements on one SI mode if two are lagging.
Rule #3: Make certain to spread the amount of COLD ECS time as evenly as possible across all three SI modes
Balance Cold measurement data between the three default 6-chip modes within 10%
of each other on an Epoch basis
Rule #4: Spread the amount of *Total* ECS time as evenly as possible across all three SI modes.
- Balance Total measurement data between the three default 6-chip modes within 10%
of each other on an Epoch basis.
Rule #3 takes precedence over Rule #4.
Rule #5:At least 60% of scheduled ECS measurement time must be -118.7degC
Rule #6: Any ECS measurements during a Perigee Passage that are cold MUST be assigned to the nominal
ECS run SI modes. i.e. Any requested Rawmode runs can be done with a warm focal plane.
All of the TE_00CA8s get counted as TE_007AE So watchout for TE_00B26 over-representation. A word about the Total Time stats:
- The Total Expected Time values for each SI mode in the table is calculated by:
# of ECS runs executed in this epoch so far * 10,000.0 * 0.76 / 3.0
Where:
10,000.0 seconds is the maximum possible time for ECS runs
We exepct only 7600.0 seconds on average - hence multiply by 0.76
We divide by three because we want the time evenly distributed across all three aggregate SI modes
A word about the COLD Time stats:
Cold Time is defiined by focal plane temperatures <= -118.7 degrees C:
The Total Expected Cold Time value is 60.0% of the Total Expected Time (see above).
SI Mode Mapping between 6,5 and 4 chip modes:
The 6 chip SI Modes consist of three distinct modes. But there are only 2, 5 chip SI Modes and only one 4 chip SI mode. To make tracking feasible, the 4 and 5 chip modes were mapped into the 6 chip modes in the following manner:
6 chip 5 chip 4 chip
TE_007AC -> TE_00C60 TE_00C62
TE_00B26 -> TE_00C60 TE_00C62
TE_007AE -> TE_00CA8
Half of the TE_00C60s get counted towards TE_007AC and the other half get counted with the TE_00B26s
Half of the TE_00C62s get counted towards TE_007AC and the other half get counted with the TE_00B26s.
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