Sirvi Autor "Allaje, Kristo" järgi

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Communications subsystem hardware and software development for the ESTCube-2 nanosatellite
(Tartu Ülikool, 2021) Allaje, Kristo; Tartu Ülikool. Loodus- ja täppisteaduste valdkond; Tartu Ülikool. Tehnoloogiainstituut
One of the most crucial components of satellites is their communications subsystem. Without a functioning radio link, it would be challenging to receive telemetry and payload data from the satellite and send telecommands to it from the ground. ESTCube-2 is a 3U CubeSat from the Estonian Student Satellite Foundation that is expectedto launch in 2022. The mission of ESTCube-2 is to test various payloads inLEO. The primary payload being the plasma brake, similar to the Electric Solar Wind Sail (E-Sail) experiment on ESTCube-1. Due to the critical nature of the satellite communications system, it is essential to start with thorough testing early to reach high reliability by the launch. The goals for this master thesis are to test ESTCube-2 communications subsystem hardware and software, and to create an engineering model, to resolve any issues discovered.
Development and Implementation of ESTCube-2 Star Tracker FPGA Design
(Tartu Ülikool, 2024) Komarovskis, Roberts Oskars; Allaje, Kristo; Eenmäe, Tõnis; Tartu Ülikool. Loodus- ja täppisteaduste valdkond; Tartu Ülikool. Tehnoloogiainstituut
Attitude determination and control play a critical role in a spacecraft, where one solution for attitude determination can be star tracking. Star tracker systems can provide high-accuracy attitude information based on star identification, and such a system is also a part of the ESTCube-2 nanosatellite developed by the Estonian Student Satellite Foundation. One of the primary components in the ESTCube-2 star tracker is a field-programmable gate array (FPGA) responsible for processing the captured images. This thesis aims to develop and implement FPGA system design and necessary algorithms for star tracking and assess the performance of the obtained design. Different FPGA design components were made to interface with external devices and perform different functions related to star tracking.
Draiveripakett käte jälgimise seadme Leap Motion kontroller kasutamiseks robootika arendusplatvormil ROS
(Tartu Ülikool, 2018) Allaje, Kristo; Kruusamäe, Karl, juhendaja; Tartu Ülikool. Loodus- ja täppisteaduste valdkond; Tartu Ülikool. Tehnoloogiainstituut
Järjest laienev robotite kasutusvaldkond nõuab inimeste ja robotite vahel üha tihedamat koostööd, mida kirjeldatakse koondterminiga inimese ja roboti suhtlus (ingl „Human-Robot Interaction“). Seetõttu on vajalik arendada töökindlaid meetodeid inimeste tuvastamiseks ning luua intuitiivseid kasutajaliideseid robotite kergeks juhtimiseks. Käesoleva bakalaureusetöö eesmärgiks on luua draiver, mis võimaldaks kasutada käte jälgimise seadet Leap Motion kontroller (LM-kontroller) robootika arendusplatvormil ROS (Robot Operating System). Kuigi arendusplatvormile ROS eksisteerib juba LM-kontrollerile draiver, siis selle funktsionaalsus ja dokumentatsioon on puudulikud ning alates 2014. aastast pole seda arendatud, sest koodihoidlal puudub aktiivne haldaja. Bakalaureusetöö raames valminud LM-kontrolleri draiveripaketi eesmärgiks on laiendada olemasoleva paketi võimalusi, tõsta seadme kasutajamugavust nii kasutajatele kui ka arendajatele ning koostada terviklik dokumentatsioon (paigaldusjuhendid ja lähtekoodi kommentaarid).
Integration of a High Speed Communications System into ESTCube-2
(Tartu Ülikool, 2024) Doğan, Melis; Allaje, Kristo; Allik, Viljo; Eenmäe, Tõnis; Tartu Ülikool. Loodus- ja täppisteaduste valdkond; Tartu Ülikool. Tehnoloogiainstituut
ESTCube-2 was a low Earth orbit CubeSat demonstrator that was launched on 9th of October, 2023. One of the main payloads of the satellite was the Earth observation payload, which was capable of producing images of tens of megabytes. Thus the spacecraft required a dedicated high speed communications system to downlink the images. At the beginning of the thesis, an S-band transmitter had been bought by the ESTCube team for this purpose. This thesis presents the integration of the HISPICO transmitter from IQ Spacecom into the ESTCube-2 platform. This integration involved writing low-level embedded device drivers to control the transmitter. The device drivers were written in C, using FreeRTOS on an STM32L4 microcontroller. Furthermore, the application level logic was created for the reception of images from the imaging payload, dividing the received images into RF frames, and adding forward error correction to the frames - a functionality that exists on HISPICO, but the ESTCube team were not given access to. For the ground station, a reception pipeline using a LimeSDR Mini and GNURadio Companion was created. To test the chain of communication, an image of 76.8 kB was transmitted over 318 HISPICO frames and was successfully received.