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TSUKUTO Updated: 19 Feb 2025   Responsible Operator Toshihiro KAMEDA JJ3GRX
Supporting Organisation University of Tsukuba, Dept. of Engineering Mechanics & Energy  
Contact Person toshihiro.kameda@gmail.com.nospam  
Headline Details: A 1U CubeSat. The technology demonstration of CubeSat Mission Piggyback Platform. One of our goals is to lower the barriers to conducting CubeSat space missions by making the satellite bus and the mission payload as modules that can be developed separately, so that organizations with specific mission objectives can integrate their developed mission payload modules onto our satellite bus module. We call this concept Mission Piggyback and we are standardizing the satellite bus specifications of CubeSat, including specific interface definitions, as the CubeSat Mission Piggyback Platform to verify the effectiveness of the design in orbit. Mission 2 Amateur Mission The technology demonstration of satellite communication system using LoRa modulation in the 430 MHz band The probability of success for university satellite missions is still generally low. Therefore, it is essential to establish stable communication links to ensure the operational reliability of this platform. By using LoRa, a modulation scheme for LPWA radio communication, it can reduce power consumption on the satellite and increase communication distance without ground station hardware upgrades. This is especially effective for CubeSat class satellites which are forced to run in limited power generation. TSUKUTO will develop a communication device using a low cost LoRa transceiver IC in the 430MHz band and demonstrate that stable communication by LoRa between a satellite in LEO and a ground station is possible. Besides, by using LoRa, which is currently not widely used by amateur radio operators, in the amateur radio band, we will contribute to the presentation of the potential use of LoRa and its popularization in the amateur radio community. Mission 3 Educational Mission The technology demonstration of modularized PMD(Post-Mission-Disposal) systems with few requirements for satellite bus systems. As the problem of space debris becomes more serious today, there is a need for reliable deorbit of retired satellites, but this is not an easy task for small satellites including CubeSats with large system constraints. To solve this problem, we are developing a PMD system that does not require precise attitude control. It uses a single sensor, such as an Earth or solar sensor, to locate its position in LEO, and then injects propellant to lower its perigee altitude and gradually decelerate due to atmospheric drag. TSUKUTO will perform self-position estimation on the satellite bus side and on-board deorbit timing calculation on the mission payload side, without propellant injection, to validate the algorithm. Mission 4 Educational Mission The technology demonstration of anomaly detection algorithm by satellite health index We are conducting research and development of an anomaly detection algorithm that introduces a new variable called health index into the anomaly detection method by machine learning. This reduces the possibility of human error introduced by traditional methods and mitigates the black boxing of error sources introduced by pure machine learning methods. The health index calculation and anomaly detection algorithm have already been verified through simulations on past satellites. As for hardware, we are planning to develop a new module using Raspberry Pi Zero as a main computer. This module is mainly composed of already used products, which will reduce the difficulty of development. Proposing a UHF downlink using LoRa, CSS, 9375bps and 2FSK(AX.25), 2000bps and CW, 80CPM. Planning a deployment from the ISS.
Application Date: 19 Feb 2025   Freq coordination completed on

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