Banca de QUALIFICAÇÃO: CAMILA BARBOSA GOMES DE ARAUJO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CAMILA BARBOSA GOMES DE ARAUJO
DATE: 18/02/2022
TIME: 09:00
LOCAL: Videoconferência
TITLE:

Onboard Computer for Low Orbiting CubeSat Nanosatellites.

KEY WORDS:

OBC; Nanossatellite; CubeSat; PCB; FreeRTOS

PAGES: 19
BIG AREA: Engenharias
AREA: Engenharia Aeroespacial
SUBÁREA: Sistemas Aeroespaciais
SPECIALTY: Satélites e Outros Dispositivos Aeroespaciais
SUMMARY:

Traditionally, the aerospace industry has been associated with large, sophisticated, and expensive devices, and it has been historically financed by governmental agencies. The space missions based on satellites were no exception to the rule. In recent decades, CubeSat nanosatellites have made it possible for universities and small companies to study these technologies and go to space. In this context, the National Institute of Spatial Research (INPE) proposed the CONASAT project, which has as its goal to update the Brazilian Environmental Data Collection System (BDCS), replacing the old satellites with a new CubeSat constellation. The BDCS, beyond satellites, is also composed of ground stations and Data Collection Platforms (DCPs) spread across the Brazilian territory. The INPE chose a 1U size CubeSat equipped with their Environmental Data Collector (EDC) as payload to collect DCPs data and send it to the ground stations. This work presents the design of an onboard computer (OBC), made of components off-the-shelf (COTS), for low-orbit CubeSat satellites. Aiming to obtain the requisites for digital systems in low-orbit, it proposes the electronic schematic and the printed circuit board (PCB) of an onboard computer compatible with the architecture of the first satellite in the BDCS constellation, the CONASAT-01, as well as the software and operating system required for the mission. The CONASAT-01 is a 1U size CubeSat with four subsystems: Electrical Power Subsystem (EPS), UHF communication subsystem, Attitude Determination and Control Subsystem (ADCS), and On-Board Computer (OBC). A third company developed the CONASAT-01's hardware, and the proposed OBC must be compatible with all CONASAT-01 subsystems. The developed board embeds FreeRTOS on an STM32 microcontroller to manage and execute the missions' tasks, such as housekeeping, supervising telecommand \& telemetry, and sending and receiving data from ground stations. All the communications drivers were also developed. The nationalization of the OBC compatible with the scheduled mission and with the global market is one of the main contributions of this dissertation: it strengthens Brazilian satellite research as it helps to develop the next CONASAT CubeSats. 

BANKING MEMBERS:
Interno - 1577068 - KURIOS IURI PINHEIRO DE MELO QUEIROZ
Interno - 2566657 - SAMAHERNI MORAIS DIAS
Externo à Instituição - JOSÉ MARCELO LIMA DUARTE - INPE