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Beacon Tasks
Gabriel Mariano Marcelino edited this page Dec 15, 2017
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The beacon executes the following tasks during its execution:
- 145 MHz band antenna deployment.
- One-way communication (RX) with the EPS module, using the FSP protocol.
- Two-way communication (TX and RX) with the OBDH module, using the FSP protocol.
- Transmission of the beacon packets (In two protocols: NGHam and AX.25), containing the data from the EPS or the OBDH module and the satellite ID ("FLORIPASAT").
- When required by the OBDH module, the transmissions are stopped for an hibernation period (shutdown).
- In case of an critical failure of the OBDH module, or the uplink channel, the beacon activates its reception and is capable of make its own hibernation (shutdown).
In the table below, the beacon tasks are listed with a brief description and its period of execution.
| Task | Description | Period |
|---|---|---|
| System initialization | Submodules initialization (CPU, memory, radio, etc.) | Aperiodic (Executed only at initializations) |
| Antenna deployment | 145 MHz band antenna deployment after the satellite launch | Aperiodic (Executed once) |
| NGHam packet transmission | Transmission of the beacon packets with a basic telemetry data using the NGHam protocol | 10, 20 or 30 seconds (EPS energy level dependent) |
| AX.25 packet transmission | Transmission of the beacon packets with a basic telemetry data using the AX.25 protocol | 10, 20 or 30 seconds (EPS energy level dependent) |
| OBDH data processing | The OBDH module can send telemetry data or commands | Aperiodic (OBDH module dependent) |
| EPS data processing | The EPS modules sends telemetry data | Aperiodic (EPS module dependent) |
| Radio data processing | Processing of an incoming packet from the beacon radio | Aperiodic (Only when the OBDH fails and an hibernation is required) |
| Beacon radio reception activation | When a critical failure occur in the OBDH module, the beacon activates its reception between the beacon transmissions | Aperiodic (Only when the OBDH module fails) |
| Radio reset | Beacon radio reset | 10 minutes |
| Beacon reset | Beacon system reset | 12 hours |