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.2020.9085277

Cited by 23 publications

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“…In this paper, the case study is based on the CubeSat 1U FloripaSat-I, whose orbit is nearly-circular and Sun-synchronous, and has an altitude of 620 km [36]. For these reasons, the orbit's inclination is simplified to 90 • and perfectly circular.…”

Section: Resultsmentioning

confidence: 99%

“…The energy levels are related to CubeSat's maximum power consumption according to the battery's state of charge. The energy levels presented, which are based on the CubeSat FloripaSat-1 [36], are related only to the available energy level (SoC). However, they can be used, for example, to trigger energy-saving states, such as decreasing the energy usage in eclipse regions.…”

Section: Resultsmentioning

confidence: 99%

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An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats

et al. 2021

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This work presents an integrated thermal-electrical simulation model, capable of taking into account the thermal and electrical effects of the battery and photovoltaic panels for each instant of time in a given orbit and attitude. Using the physical equations that govern the thermal and electrical models involved during a CubeSat operation, the proposed integrated model can estimate the temperature and energy conditions of the battery, not only in an isolated way but also in considering the mutual effects on the system. Besides, special attention is given to photovoltaic panels used in the energy harvesting process, whose performance is affected by irradiance and temperature along the orbit. The integrated model can be useful for engineers when developing the subsystems of their CubeSats, taking into account, for example, the battery temperature control through a heater. Simulations were performed to illustrate the functioning of the proposed model with variations in the power requirements of its modules and the temperature of the battery throughout the orbit, and a heater’s influence on it.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats

et al. 2021

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“…All four ESP architectures have been designed in the context of the FloripaSat-1 project. [30][31][32] The FloripaSat-1 was the first technology demonstration mission developed by the SpaceLab UFSC, at the Federal University of Santa Catarina (UFSC), Brazil. It is an open-source 1U CubeSat consisting of four core subsystems and a payload, all designed by students.…”

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][31][32] the initial assumed altitude was 310 km, which was defined by the launcher company. 2 The second parameter, also determined by the launcher, is the Sun-orbit-plane angle (β).…”

Section: Satellite Orbitmentioning

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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“…The new space era is characterized by greater accessibility, whether in an academic context or for the industry in general. This scenario favors applications aimed at research, such as FloripaSat-I [ 4 ], the CubeSat developed and built by Brazilian students at the Federal University of Santa Catarina (UFSC), and the Catarina constellation, a set of nanosatellites currently being developed by public and private entities from the State of Santa Catarina, in the southern region of Brazil, which aims to serve the agricultural and national civil defense sectors as well as foster the local space industry [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

An Energy-Aware Task Scheduling for Quality-of-Service Assurance in Constellations of Nanosatellites

Seman

Ribeiro

Rigo

et al. 2022

Sensors

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When managing a constellation of nanosatellites, one may leverage this structure to improve the mission’s quality-of-service (QoS) by optimally distributing the tasks during an orbit. In this sense, this research proposes an offline energy-aware task scheduling problem formulation regarding the specifics of constellations, by considering whether the tasks are individual, collective, or stimulated to be redundant. By providing such an optimization framework, the idea of estimating an offline task schedule can serve as a baseline for the constellation design phase. For example, given a particular orbit, from the simulation of an irradiance model, the engineer can estimate how the mission value is affected by the inclusion or exclusion of individuals objects. The proposed model, given in the form of a multi-objective mixed-integer linear programming model, is illustrated in this work for several illustrative scenarios considering different sets of tasks and constellations. We also perform an analysis of the Pareto-optimal frontier of the problem, identifying the feasible trade-off points between constellation and individual tasks. This information can be useful to the decision-maker (mission operator) when planning the behavior in orbit.

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A Critical Embedded System Challenge: The FloripaSat-1 Mission

Cited by 23 publications

References 0 publications

An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats

An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats

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

An Energy-Aware Task Scheduling for Quality-of-Service Assurance in Constellations of Nanosatellites

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