Design and Implementation RTOS (Real Time Operating System) as a Nano Satellite Control for Responding to Space Environmental Conditions

Satellite is a technology that has a very rapid development, as evidenced by the variety of missions and sizes of satellites, one of which is nano satellites. The development of satellites is influenced by the complex space conditions and the potential for the development of satellites that can be applied to facilitate human life such as weather monitoring and communication systems. OBDH is a subsystem that is the control center of a satellite that builds coordination between subsystems and the process of retrieving some housekeeping sensor data, it makes the work of OBDH to be complex at the same time so that it requires an operating system capable of managing all the resources contained in the satellite. This subsystem functions as the main control for the nano satellite system, the OBDH subsystem is designed to use a microcontroller based on the Arm Cortex M4 type STM32F446RE as the main controller. The subsystem implements (Real Time Operating System) RTOS based on Mbed OS as the Operating System (OS) in the OBDH subsystem, this OS was chosen so that the system can run more efficiently in accordance with the advantages of RTOS.

I. Introduction

Satellite technology is a technology whose application is developing very rapidly. This development can be identified through a variety of missions, dimensions and satellite configurations. One of these technologies is a nano-satellite which has dimensions of and weighs less than 10 kg, orbiting at an altitude of LEO (Low Earth Orbit). Along with the times and the ease in accessing information, nano satellite technology has become a research material within the scope of the university. Telkom University is one of the universities conducting research in this field which is named Tel - Usat. Tel - Usat carries out a mission to perform remote sensing in the form of taking pictures for earth observation with a serial camera. Attitude Determination Control System (ADCS), Electrical Power System (EPS) subsystem, payload, Telemetry Tracking and Command (TTC) and On Board Data Handling (OBDH) are subsystems that must be available in designing a nano satellite.