<title>Integrated extension board for on-board computer (OBDH) of SSETI ESEO satellite</title>

Abstract

This paper holds an information about an extension module for Single Board Computer (MIP405), which is the heart of On-board Data Handling Module (OBDH) of student Earth's microsatellite -SSETI ESEO. OBDH is a PC104 stack of four boards electrically connected and mechanically fixed. On-Board Computer is a key subsystem to the mission success -it is responsible for distribution of control signals to each module of the spacecraft. It is also expected to gather critical data for an appropriate mission progress, implementation of a part of algorithms used for satellite stabilization and orbit control and, at last, processing telecommands. Since whole system should meet spaceborne application requirements, it must be exceptionally reliable.

PW-Sat on-board flight computer, hardware and software design

“…There are several factors regarding the space environment having the highest impact on dependability and overall availability of the satellite system's space segment. This includes space radiation, high temperature variations, lack of convection, ultrahigh vacuum, etc [1]. It has been simulated (using SPENVIS [2]), that for short-term CubeSat Low-Earth Orbit (LEO) missions, the average Total Ionising Dose (TID) accumulated in silicon specimen, originating from solar proton and electron radiation as well as these coming from other extraterrestrial sources (including trapped particles and high energy ions) should not exceed a level of several krad per each monthly existence on the orbit, if basic shielding is used.…”