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| 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. (en)
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| Title
| - Reliable Onboard Computer for CubeSat-class Picosatellite, 2013
- Reliable Onboard Computer for CubeSat-class Picosatellite, 2013 (en)
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| skos:prefLabel
| - Reliable Onboard Computer for CubeSat-class Picosatellite, 2013
- Reliable Onboard Computer for CubeSat-class Picosatellite, 2013 (en)
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| skos:notation
| - RIV/68407700:21230/13:00205651!RIV14-MSM-21230___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...onomickeParametry
| - Cena komponent funkčního vzorku je cca 20tis Kč.
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/68407700:21230/13:00205651
|
| http://linked.open...terniIdentifikace
| |
| http://linked.open...riv/jazykVysledku
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| http://linked.open...vai/riv/kategorie
| |
| http://linked.open.../riv/klicovaSlova
| - Onboard Computer; CubeSat; Ionizing Radiation (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open.../licencniPoplatek
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
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| http://linked.open...UplatneniVysledku
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| http://linked.open...echnickeParametry
| - 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.
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| http://linked.open...iv/tvurceVysledku
| - Papaj, Jan
- Laifr, Jaroslav
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| http://linked.open...avai/riv/vlastnik
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| http://linked.open...itiJinymSubjektem
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| http://localhost/t...ganizacniJednotka
| |
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