IARU Amateur Satellite Frequency Coordination

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CIRBE Updated: 18 Sep 2020   Responsible Operator Scott Palo K0UOR
Supporting Organisation University of Colorado Boulder  
Contact Person palo@colorado.edu.nospam  
Headline Details: A 3U Cubesat. The primary objective of Colorado Inner Radiation Belt Experiment (CIRBE) is to understand better the formation and decay of the inner belt (L<2) electrons (100s of keV to multiple MeV), and to determine the intensity and dynamic variations of these electrons with a state‐of‐art instrument fitted into a CubeSat in a highly inclined low Earth orbit (LEO). These results will help to better understand the space weather effects of these energetic particles to spacecraft subsystem and the radio propagation environment through the ionosphere. The ionosphere density variation, which affects radio propagation, is closely correlated with the precipitation of the energetic electrons. The CIRBE measurements will be used to gain a better understanding of the space environment and will serve to improve the stat‐of‐ the‐art. CIRBE is in some ways similar to our previous very successful Cubesat (CSSWE) but differs in that it will have extreme fine energy resolution (100s of energy channels instead of 3). We propose to advance the existing instrument design by incorporating full pulse height analysis (PHA) and additional anti‐coincidence technique, such that it will have the fine energy resolution plus much cleaner measurements, but still fit in a 3U CubeSat. PHA will be performed onboard and only the final results: intensity, energy spectrum, pitch angle distribution (PAD) will be downloaded. CIRBE will operate similar to our prior cubesats ( CSSWE, MinXSS‐1, MinXSS‐2, QB‐50 Challenger, CSIM and CUTE) which have gathered over 100 MB of data from amateur operators and were all coordinated by the IARU. As has been the case in the past, we will be actively soliciting the telemetry from amateurs. The information provided by amateurs has been crucial for past missions, enabling us to detect instrument orbits and the Doppler‐shifted communication frequencies and troubleshoot anomalies. It is common for all of our missions to have extensive student involvement during the design, building, testing, and operation of the instrument. We take the training of next generation scientists and engineers very seriously. Our students will continue to be trained in the art of satellite communications, space weather, spacecraft design and operations. All students working on our cubesat projects are strongly encouraged to pursue their radio amateur license if they are not already licensed. Proposing a UHF downlink using 9k6 or 19k2 GMSK with AX25 and an S Band downlink using 1Mbps QPSK with CCSDS packets. Planning Virgin Orbit deployment on the STP-S28B launch into a 550km 97 degree orbit in April 2022> **Downlinks on 437.250 MHz and 2402.000 MHz have been coordinated**
Application Date: 04 Aug 2020   Freq coordination completed on 14 Sep 2020

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