Demodulation demonstration using the LightCube CubeSat

  • Lindsay M Berkhout School of Earth and Space Exploration Arizona State University
  • Christopher McCormick Ira A. Fulton Schools of Engineering Arizona State University
  • Daniel C Jacobs School of Earth and Space Exploration Arizona State University
  • Jaime Sanchez de la Vega Ira A. Fulton Schools of Engineering Arizona State University

Abstract

LightCube is a 1U educational CubeSat which had the goal of connecting the public with space by producing a flash visible to the naked eye on command by a public user. The spacecraft could be triggered via HAM radio communications by those with an amateur license. LightCube is commanded with a DTMF sequence, and reports telemetry using RTTY, an AFSK modulation scheme and is decoded with a custom GNURadio-companion flowgraph. Several radio applications were written, including a from-scratch decoder written for educational purposes and one optimized to be compatible with the SatNOGS environment. Lightcube deployed from the International Space Station on April 24th 2023 and operated for 24 hours before suffering a battery failure. During this time it was tracked by many amateurs around the world with observations reported to the SatNOGs database. Audio observations of the beacons were subsequently decoded by the student team and by amateurs. Having received many observations from around the world, the team has been able to reconstruct the sequence of events leading to loss of communications.

Published
2023-09-13
How to Cite
BERKHOUT, Lindsay M et al. Demodulation demonstration using the LightCube CubeSat. Proceedings of the GNU Radio Conference, [S.l.], v. 8, n. 1, sep. 2023. Available at: <https://pubs.gnuradio.org/index.php/grcon/article/view/138>. Date accessed: 19 july 2024.