• Renae Kiely

ACRUX-1 Beacon Telemetry Information

Recent update: TLE info can be found here.

  1. Frequency: 437.2 MHz

  2. Modulation: 9600 bps GMSK

  3. Polarisation: Circular

  4. Antenna: https://www.endurosat.com/products/cubesat-uhf-antenna

  5. Radio: http://www.astrodev.com/public_html2/node/33

  6. Beacon frame is transmitted every 10 seconds

  7. Transmit power: 1W

Beacon Frame

Notes: To decode, the bit stream should be NRZS decoded, then descrambled (G3RUH), then bit stuffing removed as per the AX.25 protocol. A summary of these can be found in: Communications Infrastructure for the MOST Microsatellite Project (Laura Halliday 2000).

Satellite Data

The table below contains the satellite data (mostly sensor readings) in order. The decode method refers to functions given in the python script below to demonstrate the scaling used for each field.

FIELDUNITBYTESDECODE METHODTxCount1_uint8_from_bytesRxCount1_uint8_from_bytesRxValid1_uint8_from_bytesPayloadType1_uint8_from_bytesComOutI1A2_decode_currentComOutV1V2_decode_voltageComOutI2A2_decode_currentComOutV2V2_decode_voltageComT2°C2_decode_tempEpsAdcBatV1V2_decode_voltageEpsLoadI1A2_decode_currentEpsAdcBatV2V2_decode_voltageEpsBoostInI2A2_decode_currentEpsRail1V2_decode_voltageEpsRail2V2_decode_voltageEpsTopPanelVV2_decode_voltageEpsTopPanelIA2_decode_currentEpsT1°C2_decode_tempEpsT2°C2_decode_tempXPosVV2_decode_voltageXPosIA2_decode_currentXPosT1°C2_decode_tempYPosVV2_decode_voltageYPosIA2_decode_currentYPosT1°C2_decode_voltageXNegVV2_decode_currentXNegIA2_decode_tempXNegT1°C2_decode_voltageYNegVV2_decode_currentYNegIA2_decode_tempYNegT1°C2_decode_voltageZNegVV2_decode_currentZNegIA2_decode_voltageZNegT1°C2_decode_currentZPosT°C2_decode_tempCdhTime8_uint64_from_bytesSwCdhLastReboot8_uint64_from_bytesSwSequence2_uint16_from_bytesOutreachMessage48_decode_str

Recent update: To see how the sensors readings are interpreted, see the code at https://melbournespace.com.au/static/sensors.py

Posted Friday, 21 June 2019

#launch #MelbourneSpaceProgram #CubeSat #beacontelemetry #ACRUX1

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