IARU Amateur Satellite Frequency Coordination

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ODALISS_AMA Updated: 08 Jun 2023   Responsible Operator Higinio Alaves EA5JJS
Supporting Organisation Embedded Instruments and Systems S.L. (EMXYS)  
Contact Person higinio.alaves@emxys.com.nospam  
Headline Details: ODALISS_AMA is a 3U Cubesat. The first mission of the ODALISS_AMA satellite, OTD-1 mission (ODALISS_AMA Technology Demonstration - 1), seeks to offer a satellite amateur payload, designed under recommendation of the Spanish Amateur Association. This is possible thanks to the goal of demonstrating the space platform and consequently, offering a dedicated payload to satellite amateur. In addition, the ODALISS_AMA will provide various communications links between the satellite and the ground station to test the functionality of the various units and subsystems that operate on board the satellite. The main transceiver system of the ODALISS_AMA will add a digital repeater functionality to the satellite radio to offer a "storeand- forward" service to the amateur public, so that the radio amateur community can make use of the satellite communications link using the repeater which will receive a radio signal at one end and re-transmit it on demand by telecommand using frames based on the AX.25 public protocol. Specifically, the transceiver (in repeater mode) will wait until the data (frames) sent by the radio amateurs arrive complete to be stored in memory and be forwarded on demand using the remote telecommands reserved for it. All the information and telecommands as well as the instructions to work with the digital repeater will be published and available on the company's web site before the satellite is launched. Some features of the ODALISS_AMA are: - The mass of the satellite will be 3 kg. - The useful life of the satellite will be 3 years (36 months), assuming that the frequency assignments will be cancelled after said period. At the end of its useful life, the satellite will passivate entering a deactivation mode that will imply the disconnection of the batteries so that, at the end of the orbital period of the satellite, it enters the atmosphere disintegrating since the design has been made considering that no part will survive atmospheric re-entry. We confirm that the purpose of the satellite is to offer a payload for communication links between satellite radio amateurs and the satellite. Specifically, we confirm the purpose of selftraining, intercommunication and technical investigations carried out by amateurs interested in radio techniques solely with a personal aim and without any kind of financial compensation. For these purposes, and due to the successful experience of Emxys collaborating with the radio amateur community in other past missions such as the UPMSat-2 (satellite of the Polytechnic University of Madrid), ODALISS_AMA main radio transceiver will add a digital repeater functionality on the TTC system. This repeater functionality will cover four of the most important reasons for needing this kind of technology onboard a satellite: 1- Poor coverage. Amateur users who are required to communicate away from their main stations require a better coverage to reach large distances. A satellite repeater will cover this necessity. 2- Cost-effectiveness. A digital repeater is cost-effective as compared to other repeaters installed on ground. 3- Signal power. Repeater has the potential to boost the signal power once the message is retransmitted. 4- Link performance. It is easy to connect to a satellite digital repeater for an amateur user and it has minimal impact on network performance. Apart from the use of the on-board transceiver, users will be able to additionally download internal telemetry data from the satellite including data on temperature, attitude, etc. For this, the satellite includes a series of sensors and a GPS-based attitude control system and three magnetic inductors that will establish the position in the three X-Y-Z axes, generating a magnetic torque to control the attitude of the satellite. Using all these data, users will be able to selftrain in mission analysis theory and orbit and attitude determination of the satellite. Both, uplink, and downlink channels will not use any data encryption, so it will be available to the radio amateur community during pre-programmed periods of time during which users will be able to communicate with the satellite. Public telemetry, schedules and other predefined data from the satellite will also be publicly available for amateur use at the company’s web site. Art. 25 conditions of the RR will be observed. Proposing a UHF downlink using 2-FSK at 1k2, or 4k8 or 9k6 bps data rate. planning a launch into a 450x502km polar orbit possibly from Andaya using Isar Aerospace Technologies GmbH late 2023 or Q1 2024
Application Date: 06 Jun 2023   Freq coordination completed on

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