Software Defined Radio (SDR) uses a processor, a special receiver and software that play the main parts of the receiver (mixer, filters, amplifiers, modulators, demodulators, etc.) and it is quite advantageous for its flexibility and compact size as it reduces the amount of hardware components while adapting for different needs. This work briefly presents the SDR concept and approach for obtaining satellite telemetries and imagery in the context of different modulation schemes, link budget requirements and different satellites types. Two case studies are presented for supporting affordable ground segment and promoting satellites projects in Brazil. Reception from the 1 st Brazilian picosatellite, Tancredo-1, with specific software developed, UbaTM is presented for obtaining satellite raw telemetries, convert them to engineering value and friendly present on user screen. A series of support software packages are then introduced so that one can pipeline various operations and automate tasks in the ground station. Finally, a second study case was performed in order to receive NOAA class satellites imagery over VHF band and decoded by specific software freely available. Using the proposed SDR approach, it can adapt to projects mainly those with a limited budget and outreach for major inclusion on space topics in Brazil.
1 cassiano.filho, 2 auro.tikami, 3 elaine.paula, 4 jhonathan.pineros, 5 georgeff.sp, 6 lazaro.camargo, 7 carlos.ambsantos, 8 walter.abrahao, 9 kleber.naccarato [@inpe.br] Resumo: Eventos atmosféricos severos são responsáveis por centenas de mortes e bilhões de dólares de danos anualmente em todo o mundo. No Brasil, diferentemente dos outros eventos hidrometeorológicos, os eventos atmosféricos severos são aleatórios e, assim, não apresentam padrão sócio espacial. Nesse contexto, há uma motivação significativa no sentido de aprimorar as técnicas de previsão desse tipo de evento utilizando modelos numéricos de alta resolução. Para isso, é necessária uma grande quantidade de dados observacionais de qualidade, entre eles dados de descargas atmosféricas em tempo quase real. Além disso, a detecção das descargas atmosféricas produzidas pelas tempestades é importante para uma ampla variedade de aplicações e em diversas áreas da pesquisa científica, que incluem o entendimento da ação do homem sobre o clima e como as mudanças climáticas podem afetar o comportamento das tempestades em longo prazo. Um dos métodos é a obtenção de dados através de satélites, neste sentido o objetivo do projeto RaioSat é desenvolver tecnologia nacional para detecção de descargas atmosféricas a partir do espaço a fim de complementar os dados existentes da rede de detecção de solo BrasilDAT. Este documento apresenta a metodologia para o desenvolvimento do sistema RaioSat.
Annually, severe weather phenomena are responsible for tens of thousands of deaths and tens of billions of dollars of damage around the world. In Brazil, unlike other hydrometeorological events, severe atmospheric events are random and, therefore, do not have a sociospatial pattern. Because of that, there is a significant motivation to improve the prediction techniques for this kind of events, using high resolution numerical models. A large amount of high-quality observational data is required, including lightning data in a very short-range. In addition, the detection of lightning flashes produced by storms is important for a wide variety of applications and in some areas of scientific research, which include the understanding of the human action on the climate and how the climate change can affect the behavior of storms in long range. One method to monitor the lightning flashes is the implementation of sensors in satellites to obtain data. In this sense, the objective of the RaioSat project is to develop national technology for detecting lightning flashes from the space, in order to complement the existing data from the ground detection network, BrasilDAT. The main objective of this article is to present a methodology for the development of the RaioSat mission including some parts of the preliminary design and operational modes. Additionally, the article describes the expected results and the continuity of the project and a preliminary analysis of a constellation for future projects.
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