IARU Amateur Satellite Frequency Coordination

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TRISAT Updated: 09 Apr 2020   Responsible Operator Iztok Kramberger S56WIK
Supporting Organisation University of Maribor  
Contact Person iztok.kramberger@um.si.nospam  
Headline Details: TRISAT is an educational 3U CubeSat satellite mission which aims to establish a mutual cooperation between Slovenian university students and the Slovenian space industry. It helps to facilitate a knowledge and technology transfer between the university and the economy through innovations and technologies and with effective support of entrepreneurship and innovative ecosystems, resulting in a symbiotic relationship between both spheres. During normal operating conditions the spacecraft will operate in idle mode, where it will point towards the sun, gather energy. The imaging payload and the payload high throughput communication subsystem operating in S-Band frequency range will be turned off. The satellite will periodically transmit unsolicited telemetry data in UHF radio amateur band as well as respond to telecommand requests from the ground segment in the VHF radio amateur band. Other modes will be entered via the OBC scheduler, which is synchronized to the GNSS time and location. A typical in-orbit operation and demonstration cycle includes two phases, both entered via the scheduler commands. In the imaging phase, the satellite will point the imager towards the earth’s surface and gather imaging data. Afterwards, it will return to idle mode. The data will then be stored inside the OBC’s mass storage, where thumbnails will also be generated. The gathered image data will be transferred to ground segment using payload high throughput communication subsystem. The satellite’s CCSDS compatible primary full-duplex communication module will operate in VHF and UHF radio amateur bands. Extensive telemetry will be provided by the satellite’s on-board data handling as part of the beacon including many housekeeping parameters. A novel Total Ionization Dose sensor value will be included within the beacon telemetry data, which will give useful information about the Total Ionization Dose accumulated during among satellite’s orbit. Furthermore, the telemetry will include satellite’s in-orbit location provided by the onboard GNSS receiver. As part of the radio amateur services the CCSDS compatible fullduplex communication module will act as a digipeater relaying CCSDS compliant data framing, which will be publically available to the radio amateur community. The satellite’s call sign will be S55XTR. Proposing a 9k6 GFSK downlink. Planning a Launch from French Guiana in Sept 2019 into a 530km SSO. More info at http://www.trisat.um.si/en/operations/ ** Coordination has been declined as the mission does not meet the definition of the amateur and amateur satellite service as set out in articles 1.56 and 1.57 of the ITU radio regulations.**
Application Date: 25 May 2019   Freq coordination completed on

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