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Power Details/Operations
Power Requirements by Payload/Subsystem
Power Usage Configurations/Modes
The Vital Systems include: Command & Data Handling, Main Communications, and ICSat recievers
The Experiments include: CFTP, MIDN, MEMS, Eclipse, and ChemSensor*
The satellite operations have been broken down into a 24 hour period or 15 orbits consisting of one day. The ten consecutive orbits where there are no passes over the USNA are considered the satellite 'Day.' The five consecutive orbits where there are passes over the USNA are considered the satellite 'night.'
During the 'Day' experiments will be run and the satellite will be in a receive mode. In Configuration #2 on Power Usage Configurations/Modes of Normal Ops, the ICSat receiver cycles on/off, to reduce the power load due to the running of several experiments. During the 'Night' the experiments will be put on standby, both receivers kept on, and the transmitters will be turned on during the pass. Although the transmitters use higher wattage power, they would be on for a maximum of 12% of an orbit, and thus their average falls below 27 W.
In the event of an emergency, the satellite will go into Safe Mode. The power will be cut to all experiments. Power will be supplied to the Vital Systems and both receivers will be run continuously. The satellite will go into a beep-receive mode where it transmits with the Main Communications transmitter, waits, transmits with the ICSat transmitter, waits, and repeats the cycle until contact is established and it is instructed to exit Safe Mode.
'Daylight' and 'Eclipse' refer to the sunlight conditions of the portion of the orbit the satellite is in. Eclipse includes when the satellite is in the Penumbra and Umbra of the Earth.
'Day' and 'Night' refer to the operational modes of the satellite.
Year 1 Eclipse Statistics:
| Time (min) | Percent Orbit | |
|---|---|---|
Minimum: |
1 |
1% |
Maximum: |
54 |
57% |
Average: |
33 |
34% |
Full Orbit: |
95 |
100% |
Switching between power configurations, turning on/off of experiments, and monitoring of the power system will be performed by the Command & Data Handling system.
*ChemSensor is a one time experiment. Excess power will be used for its single run and then the experiment will be dead. No power is budgeted for it during normal ops.