IARU Amateur Satellite Frequency Coordination

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CP10-Exocube Updated: 05 May 2014   Responsible Operator Chad Taylor KK6HGC
Supporting Organisation PolySat  
Contact Person ctaylor259gmail.com.nospam  
Headline Details: CP10, or Exocube, is a 3U CubeSat with the mission of acquiring in-situ densities of ions and neutrals in the upper ionosphere and lower exosphere. CP10 uses a gated time-of-flight spectrometer developed by NASA Goddard. Atomic oxygen and helium have not been measured in situ since the early 1980s and atomic hydrogen has never been measured directly in situ in this region. This data will help characterize the climatology of the upper ionospheric and lower exospheric composition. With a lifetime of 6 months, there is enough data to compare equinox and solstice conditions. On average, the payload produces 1.5 Megabits per orbit. Every pass over a ground station, the data will automatically begin downlink while new TLEs are uplinked to the satellite. Currently, the passes occur every seven to eight orbits, so a high data rate is highly preferred. Key scientific objectives include investigation of upper atmospheric global, diurnal, and seasonal variability, charge exchange processes, atmospheric response to geomagnetic storms, and validation of empirical and climatological atmospheric models (e.g. MSIS, TIE-GCM). To house the instrument, an environmental chamber with deployable doors was built. The chamber includes an adjustable check valve, umbrella valves, and silicone o-ring gaskets. To acquire accurate data, Nadir pointing must be maintained of +/- 10 degrees and ram pointing of +/- 5 degrees. An attitude determination control system (ADCS) was developed in order to meet these pointing requirements. The ADCS includes deployable booms for gravity gradient stabilization and a Sinclair 10 mNm reaction wheel mounted on the pitch axis to couple the roll and yaw axes. An extended Kalman Filter provides the correct orientation of the satellite through magnetometer and solar sensor readings by using an Euler integrator and filtering out the sensor noise. This orientation data gets fed into the PD control law which then outputs the needed torques to the Magnetorquers. The PD control law was developed by Bong Wie and has proven global stability. proposing a UHF downlink using AX25 and GMSK or PSK modulation at variable data rates of up to 38k4. Will also have a CW preamble. Planned for the Elana 10 mission into 400x700km polar orbit.** A frequency of 437,270 MHz has been coordinated**
Application Date: 11 Nov 2013   Freq coordination completed on 04 May 2014

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