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Statements

Subject Item
n2:RIV%2F68407700%3A21230%2F13%3A00205651%21RIV14-MSM-21230___
rdf:type
n3:Vysledek skos:Concept
rdfs:seeAlso
http://www.czechtechsat.cz
dcterms:description
The breadboard model of the onboard computer subsystem was developed to validate the concepts of reliability improvement strategies of electronic systems exposed to ionizing radiation, in this case, in the project of a small student satellite “CzechTechSat”. Microcomputer subsystem is based on two identical cores (C8051F120 microcontroller) for its high computational performance (up to 100 MIPS) and motivated by the positive flight heritage during %22QBX 1%22 and %222 QBX%22 CubeSats space campaigns. Subsystem size and layout corresponds to the industrial PC/104 + format containing doubled serial interface with differentiators (to reconstruct the data carrier signal from heavilly impedance loaded buses onboard satellite, six analog inputs for signals from temperature sensors, interface for onboard color camera with current consumption measurement. Subsystem integrates electronic circuits for the processing of the diagnostic software (Housekeeping) with intelligent power management. Increasing reliability is achieved by doubling the computing cores operating in the cold redundancy. The method is motivated by the assumption of physical effects of impact of the ionizing radiation on semiconductor devices and MOS structures in the biased and unbiased states. Each microcontroller is equipped with non-volatile flash memory for data storage running in triple module redundancy scheme, with smart power control to achieve zero voltage supply within the maximum possible dutycycle. Current consumption of memory is also monitored for easy detection of Latch-up failure or overload, thus making it possible to protect the main satellite power supply bus. Voltage regulator for both units is implemented using BJT and JFET transistors. Their use is motivated by known lower sensitivity of parameter degradation of bipolar structures and field-effect transistors without insulating layer of SiO2. The breadboard model of the onboard computer subsystem was developed to validate the concepts of reliability improvement strategies of electronic systems exposed to ionizing radiation, in this case, in the project of a small student satellite “CzechTechSat”. Microcomputer subsystem is based on two identical cores (C8051F120 microcontroller) for its high computational performance (up to 100 MIPS) and motivated by the positive flight heritage during %22QBX 1%22 and %222 QBX%22 CubeSats space campaigns. Subsystem size and layout corresponds to the industrial PC/104 + format containing doubled serial interface with differentiators (to reconstruct the data carrier signal from heavilly impedance loaded buses onboard satellite, six analog inputs for signals from temperature sensors, interface for onboard color camera with current consumption measurement. Subsystem integrates electronic circuits for the processing of the diagnostic software (Housekeeping) with intelligent power management. Increasing reliability is achieved by doubling the computing cores operating in the cold redundancy. The method is motivated by the assumption of physical effects of impact of the ionizing radiation on semiconductor devices and MOS structures in the biased and unbiased states. Each microcontroller is equipped with non-volatile flash memory for data storage running in triple module redundancy scheme, with smart power control to achieve zero voltage supply within the maximum possible dutycycle. Current consumption of memory is also monitored for easy detection of Latch-up failure or overload, thus making it possible to protect the main satellite power supply bus. Voltage regulator for both units is implemented using BJT and JFET transistors. Their use is motivated by known lower sensitivity of parameter degradation of bipolar structures and field-effect transistors without insulating layer of SiO2.
dcterms:title
Reliable Onboard Computer for CubeSat-class Picosatellite, 2013 Reliable Onboard Computer for CubeSat-class Picosatellite, 2013
skos:prefLabel
Reliable Onboard Computer for CubeSat-class Picosatellite, 2013 Reliable Onboard Computer for CubeSat-class Picosatellite, 2013
skos:notation
RIV/68407700:21230/13:00205651!RIV14-MSM-21230___
n3:predkladatel
n4:orjk%3A21230
n7:aktivita
n19:S
n7:aktivity
S
n7:dodaniDat
n12:2014
n7:domaciTvurceVysledku
n14:2789248 n14:5982065
n7:druhVysledku
n16:G%2FB
n7:duvernostUdaju
n17:S
n7:ekonomickeParametry
Cena komponent funkčního vzorku je cca 20tis Kč.
n7:entitaPredkladatele
n9:predkladatel
n7:idSjednocenehoVysledku
102279
n7:idVysledku
RIV/68407700:21230/13:00205651
n7:interniIdentifikace
CTS-OBC-BBM
n7:jazykVysledku
n10:eng
n7:kategorie
n18:A
n7:klicovaSlova
Onboard Computer; CubeSat; Ionizing Radiation
n7:klicoveSlovo
n11:Ionizing%20Radiation n11:Onboard%20Computer n11:CubeSat
n7:kontrolniKodProRIV
[AF03084950E5]
n7:licencniPoplatek
n15:Z
n7:obor
n20:JV
n7:pocetDomacichTvurcuVysledku
2
n7:pocetTvurcuVysledku
2
n7:rokUplatneniVysledku
n12:2013
n7:technickeParametry
PC/104+ format subsystem is equipped with six inputs for temperature sensors, interface for color camera with dedicated current measurements, doubled data communication bus, I2C, SPI, power arbiter, discrete-based voltage source. OBC PCB weight is 53 g, camera weight os 12 g, temperature range -40°C up to +85°C, power consumption is 80 mW in active mode without camera +191 mW additional with camera on.
n7:tvurceVysledku
Papaj, Jan Laifr, Jaroslav
n7:vlastnik
n9:vlastnikVysledku
n7:vyuzitiJinymSubjektem
n8:P
n21:organizacniJednotka
21230