Gabriel Mariano Marcelino edited this page Feb 8, 2019 · 11 revisions

FloripaSat TTC Wiki

In this wiki page you can find the general documentation of the Telemetry, Tracking and Command module of the FloripaSat project.

The TTC (or TT&C) is the communication module of the FloripaSat cubesat. It is responsible to make the communication between the earth (A ground station) and the satellite, and is divided in two sub-modules: Beacon and telemetry.

The beacon is a independent sub-module who transmits a periodic signal containing an identification data (ID) of the satellite and some basic telemetry data.

The telemetry sub-module is the main communication device. It has a bidirectional data link to receive telecommands from the earth and transmit all the requested data.

The telemetry sub-module is controlled by the OBDH module (The OBC of the satellite), and the software for handling with this sub-module is under development in the OBDH repository, and is not documented here.

The engineering model of the TTC module can be seen in the figure below.

In the menu on the right of this page, you can find further information about this module.

General Information

Beacon

  • Frequency: 145,9 MHz
  • Modulation: GFSK
  • Baudrate: 1,2 ksps
  • Deviation: 2,5 kHz
  • Power: 30 dBm (1000 mW)
  • Protocols: NGHam and AX.25
  • Packets preamble: 4 bytes (0xAA)
  • Packets sync. word: 4 bytes (0x5D, 0xE6, 0x2A, 0x7E)
  • Transmission period: 10, 20 or 30 seconds between packets (It is dependent of the energy level of the satellite)

Transceiver

  • Frequency: 437,9 MHz
  • Modulation: GFSK
  • Baudrate: 2,4 ksps
  • Deviation: 5 kHz
  • Power: 30 dBm (1000 mW)
  • Protocols: NGHam
  • Packets preamble: 4 bytes (0xAA)
  • Packets sync. word: 4 bytes (0x5D, 0xE6, 0x2A, 0x7E)
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