Suhtlusprotokoll ESTCube-2 alams¨usteemide vaheliseks suhtluseks

Abstract

Back in 2008 University of Tartu started the first Estonian Student satellite project. Five yearslater the first Estonian satellite ESTCube-1 was launched to low Earth orbit. ESTCube-1’s mission was to perform the first in-orbit demonstration of electric solar wind sail (E-sail) technology. In the next few years the Estonian Student satellite program aims to conduct a similar experiment further away from Earth, so that the Earth’s magnetic field would have minimal effect on the results. For the satellite to succeed it’s subsystems need to be able to communicate. Due to fundamental differences in ESTCube-1 and ESTCube-2, the internal communication protocol can not be integrated to ESTCube-2. The purpose of this thesis is to find a suitable protocol to be used on ESTCube-2. If need-be describe the specification and start the implementation and testing of a new protocol. The thesis is divided into six chapters. First chapter is the introduction. Second chapter describes the hardware selection and the shared communication bus of the ESTCube-2 satellite. In the third chapter, an in depth overview of the problem and other standard protocols is given. The specification and description of the new proposed protocol can be found in chapter four. Chapter five gives an overview of the problems that occurred during development and a short description about the testing procedures. Future work and further development is proposed in the last chapter.