Error Detection and Correction  System (EDAC) of On Board  Data Handling (OBDH) in Real  Time Operating System Behaviour

The satellite requires the support of a robust sub system. On Board Data Handling (OBDH) is the core function of the satellite subsystem and has to be error free in managing the operation of the satellite. It should withstand the harsh environmental conditions in space that has a lot of hazards caused by radiations. In view of these two conditions, the OBDH design should be able to manage the operation and overcome the hazards of radiation. In order to manage the operation Real Time Operating System (RTOS) was applied. RTOS was able to manage the task efficiently and effectively. In the aerospace domain, RTOS has become popular because of its strength in managing the operating system. Error Detection and Correction System (EDAC) system was applied to make OBDH more robust. This paper discusses the implementation of the EDAC system in tandem with the RTOS behaviour to manage the operation and increase the robustness of the system. The findings show that OBDH can be programmed successfully using RTOS to handle critical and robust operations.

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Error Detection and Correction System (EDAC) of On Board Data Handling (OBDH) in Real Time Operating System Behaviour

Scientific Research Journal ◽

10.24191/srj.v10i2.9402 ◽

2013 ◽

Vol 10 (2) ◽

pp. 17

Author(s):

Haryono Haryono ◽

Eko Putra ◽

Jazi Eko Istiyanto ◽

Agus Harjoko

Keyword(s):

Operating System ◽

Real Time ◽

Error Detection ◽

Data Handling ◽

System Error ◽

Real Time Operating System ◽

The Core ◽

Core Function ◽

Error Detection And Correction ◽

Correction System

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Policy-independent real-time operating system mechanisms for timing error detection, handling and monitoring

Proceedings. IEEE High-Assurance Systems Engineering Workshop (Cat. No.96TB100076) ◽

10.1109/hase.1996.618580 ◽

2002 ◽

Cited By ~ 1

Author(s):

D.B. Stewart ◽

P.K. Khosla

Keyword(s):

Operating System ◽

Real Time ◽

Error Detection ◽

Timing Error ◽

Real Time Operating System

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Design of Embedded Indoor Multiple Dangerous Gas Detection Alarm System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.475-476.209 ◽

2013 ◽

Vol 475-476 ◽

pp. 209-213

Author(s):

Hong Fang ◽

Lin Cai Deng

Keyword(s):

Operating System ◽

Embedded System ◽

Real Time ◽

Remote Monitoring ◽

Gas Detection ◽

Alarm System ◽

Communication Interface ◽

Real Time Operating System ◽

Arm Processor ◽

The Core

This paper describes a embedded system,using ARM processor LPC2148 as the core of hardware,and using MQ series gas sensor as the detection component,and using ENC28J60 as the network communication interface,and using uc / OS-II real-time operating system as software platform for the real-time remote monitoring of density of harmful gases indoor.In this system,voltage signals from MQ sensor will be processed by the ARM micro-controller and be displayed in the LCD.Then they will be compared with the set voltage value.If they are greater than the set value,sound and light alarm will be touched off,and data will be transfered to the network through the ARM ENC28J6 network interface.Above all,the system is able to achieve accurate detection, alarm and remote monitoring indoor dangerous gases.

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Desain dan Implementasi On-Board Computer/ On-Board Data Handling (OBDH) pada UGM-SAT

IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) ◽

10.22146/ijeis.7155 ◽

2015 ◽

Vol 5 (1) ◽

pp. 77

Author(s):

Bakhtiar Alldino Ardi Sumbodo ◽

Agfianto Eko Putra

Keyword(s):

Real Time ◽

Error Detection ◽

Extreme Temperature ◽

Internal Clock ◽

Data Handling ◽

Engineering Model ◽

Real Time Clock ◽

Error Detection And Correction ◽

S Model ◽

Industrial Standards

AbstrakTelah berhasil dibuat model teknik subsistem OBDH dari UGM-SAT. Subsistem OBDH bertugas untuk mengendalikan pertukaran data dan komunikasi antara OBDH dengan subsistem lain. Pengendali utama dari OBDH menggunakan mikrokontroler PIC16F877A dengan frekuensi clock 20 Mhz. OBDH dilengkapi dengan empat buah eksternal EEPROM tipe 24LC256, digunakan untuk menyimpan data housekeeping satelit.Sub sistem OBDH dilengkapi dengan tiga buah sensor yaitu sensor arus ACS712ELCTR-05B-T, sensor tegangan dan sensor suhu LM355Z. Akurasi pengukuran ketiga sensor tersebut yaitu lebih dari 99%.Sub sistem OBDH dilengkapi dengan IC Real Time Clock (RTC) DS3232M dengan internal clock 32,768 KHz, digunakan untuk menyesuaikan waktu antara OBDH dengan subsistem lainnya.Pemilihan komponen pada subsistem OBDH diharuskan memenuhi kriteria yaitu berstandar industri, berukuran kecil dan memiliki tingkat konsumsi listrik rendah.Desain OBDH dirancang agar sistem dapat beroperasi pada kondisi lingkungan yang ekstrim. Komunikasi antara OBDH dengan subsistem lain menggunakan standar komunikasi I2C. Protokol komunikasi data antar subsistem dirancang dengan mengimplementasikan algoritma kode Hamming(8,4), untuk mencegah kesalahan penulisan data housekeeping pada EEPROM eksternal, yang disebabkan oleh radiasi. Kecepatan deteksi dan koreksi kesalahan pada data telemetri dengan algoritma kode Hamming(8,4) yaitu 1.800 byte/s. Model teknik OBDH dari UGM-SAT telah memenuhi spesifikasi standar dari misi satelit dan siap untuk dilakukan pengujian perangkat keras dan perangkat lunak lebih lanjut. Kata kunci—OBC/OBDH, algoritma kode Hamming(8,4), deteksi dan koreksi data, I2C Abstract The engineering model of OBDH for UGM-SAT was designed to control data handling program and tointerface the satellite subsystems to OBDH. The OBDH’s based on the Microchip microcontroller PIC16F877A with 20 Mhz clock speed. The system’s equipped with four external 24LC512 EEPROM’s with a storage capacity of 256 kB. The external memories’re used to store housekeeping information. The system’s equipped with a ACS712ELCTR-05B-T current sensor, voltage sensor and LM335Z temperature sensor. The accuracy of the measurements’re more than 99%. The system’s also equipped with IC Real Time Clock (RTC) DS3232M with an internal clock of 32.768 Hz, which’s used to synchronize the time between OBDH with other subsystems.The components of OBDH was chosen with industrial standards, small packages and low power. OBDH’s designed to operate in environments with extreme temperature conditions. The communication with other subsystems was designed to use I2C-bus. Protocol data for communication between the satellite subsystems have been designed. A HammingCode(8,4) algorithm has been implemented to protect housekeeping information from being corrupted due to radiation. Error detection and correction speed is 1.800 byte/s. The engineering model of OBDH for UGM-SAT have met the standard specifications, and ready for further testing hardware and software. Keywords—OBC/OBDH, Hamming Code(8,4) algorithm, error detection and correction, I2C

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Transient Error Detection During UDUT Covariance Calculations Using Algorithm Based Fault Tolerance

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.2801246 ◽

1997 ◽

Vol 119 (2) ◽

pp. 284-286

Author(s):

G. E. Young ◽

M. R. Moan ◽

E. A. Misawa

Keyword(s):

Operating System ◽

Kalman Filter ◽

Fault Tolerance ◽

Real Time ◽

Error Detection ◽

Linear Estimation ◽

Real Time Operating System ◽

Estimation Algorithms ◽

Time Simulation ◽

Transient Error

Algorithm based fault tolerance is studied for use with linear estimation algorithms such as the Kalman filter. Emphasis is placed on the study of algorithm based fault tolerance used in conjunction with the UDUT covariance calculation. A real-time simulation has been performed in a VMEbus environment utilizing a single board computer and a commercial real-time operating system.

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