A Critical Embedded System Challenge: The FloripaSat-1 Mission

Marcelino, Gabriel Mariano; Vega-Martinez, Sara; Seman, Laio Oriel; Slongo, Leonardo Kessler; Bezerra, Eduardo Augusto

doi:10.1109/tla.2019.9082235

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Also, there are latch-up monitors for each memory and interfaces for integration with a CubeSat platform. The board uses the FloripaSat [18] missions payload standard, targeting the FloripaSat-2 [19] mission scheduled to launch in 2022, and follows a simplified space application design guideline.…”

Section: A Devices Under Testmentioning

confidence: 99%

Technology Impact on Neutron-Induced Effects in SDRAMs: A Comparative Study

Luza

Söderström²,

Mattos

et al. 2021

2021 16th International Conference on Design &Amp; Technology of Integrated Systems in Nanoscale Era (DTIS)

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This study analyses the response of synchronous dynamic random access memories to neutron irradiation. Three different generations of the same device with different node sizes (63, 72, and 110 nm) were characterized under an atmospheric-like neutron spectrum at the ChipIr beamline in the Rutherford Appleton Laboratories, UK. The memories were tested with a reduced refresh rate to expose more single-event upsets and under similar conditions provided by a board specifically developed for this type of study in test facilities. The board has also been designed to be used as a nanosatellite payload in order to perform similar tests. The neutron-induced failures were studied and characterized, presenting the occurrence of single-bit upsets and stuck bits. The cross sections for each type of event and technology node show that the 110 nm model is more sensitive to neutron-induced single-event effects than the other models.

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Section: A Devices Under Testmentioning

confidence: 99%

Technology Impact on Neutron-Induced Effects in SDRAMs: A Comparative Study

Luza

Söderström²,

Mattos

et al. 2021

2021 16th International Conference on Design &Amp; Technology of Integrated Systems in Nanoscale Era (DTIS)

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“…However, before going to the circuits analyses, it is important to contextualize the EPS development. All four ESP architectures have been designed in the context of the FloripaSat‐1 project 30‐32 . The FloripaSat‐1 was the first technology demonstration mission developed by the SpaceLab UFSC, at the Federal University of Santa Catarina (UFSC), Brazil.…”

Section: Case Study: the Floripasat‐1 Eps Overviewmentioning

confidence: 99%

“…The first parameter to be considered is the orbit altitude, which is part of the mission definition. For the FloripaSat‐1 project, 30‐32 the initial assumed altitude was 310 km, which was defined by the launcher company. The second parameter, also determined by the launcher, is the Sun‐orbit‐plane angle ( β ).…”

Section: Input Power Model and Simulationsmentioning

confidence: 99%

Nanosatellite electrical power system architectures: Models, simulations, and tests

Slongo

Martinez

Eiterer

et al. 2020

Circuit Theory & Apps

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KESSLER SLONGO ET AL. power point tracking (MPPT) techniques, high-efficiency solar cells, and energy-aware scheduling algorithms are some of the hot topics under research nowadays. Due to size restrictions and aiming low complexity in design, many nanosatellite designers adopt the direct energy transfer (DET) architecture. KySat-2 is an example of a successfully accomplished mission, based on this EPS topology. Designed by Morehead State University Space Science and Engineering group, KySat-2 EPS was powered by a set of gold-plated deployable solar panels with 26% of efficiency. It provided four high-power regulated rails (two 3.3 V and two 5 V) and a low-noise, low power 3.3V rail for noise-sensitive devices. The energy storage system was made of three 18650 lithium-ion cells connected in series, and the high-power rails reached efficiencies approaching 90%. 12,21 Aiming minimum space occupation and low power consumption, the EPS proposed for the AraMiS project has a boost regulator operating the solar panels close to their MPP. 16 In order to reduce the number of components, the designers opted by the constant voltage MPPT algorithm, using only analog devices. The EPS steps up solar panels voltage from 4.4 V to the distribution bus voltage level (14 ± 2 V). It provides power buses with 3.3 and 5 V voltage levels. The EPS efficiency analysis is demonstrated, calculating the main components power losses. Although this is a very detailed and well-described work, it does not compare the proposed solution with other EPS architectures. A 3U EPS efficiency analysis is presented by Gonzalez-Llorente et al. 22 The subsystem is based on a buck converter that steps down the solar panels voltage (15 or 7.5 V) to the litChium-ion battery range of 3.3 or 6.6 V. The authors define an optimum operation point for the DC-DC converter in order to achieve its maximum efficiency. The operation point is defined by the converter input voltage, output voltage, and output power. Therefore, the discussion is based on different solar cells connections configurations, and battery cells arrangement, that result in the most efficient EPS configuration. Different scenarios have been analyzed to achieve 98% of peak efficiency on the best configuration: input voltage of 7.4 V, output voltage of 3.3 V, and output current varying from 0.1 mA to 2.1 A. Only the buck converter topology is discussed in this paper, and it does not consider any MPPT technique. An interesting solution adopted for the ERPSAT-1 picosatellite uses fuzzy logic to obtain energy harvesting maximization. 23 The developed subsystem has three main blocks, which are the fuzzy maximum power point tracker, the power conditioner, and the hierarchical fuzzy subsystem controller. The fuzzy logic algorithm has been implemented in a dedicated microcontroller that controls a boost converter. Simulations have been performed to demonstrate the better efficiency of the proposed method when compared to the Perturb and Observe MPPT algorithm. Although a comparison is provided in this work,...

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