위성과 지상국 사이의 데이터 송수신 패킷 처리 소프트웨어 디커플링으로 재사용성이 향상된 프로그램 개발

Abstract

In recent years, a cube satellite (hereinafter referred to as CubeSat) has attracted attention in the space sector, and its platform is being used to perform a variety of scientific or technical satellite missions at low cost. To successfully perform the satellite mission, the communication protocol with a ground station must be carefully designed and established. Software reusability is one of the important elements in implementing the communication protocol to effectively reduce the system development period and its budget. This thesis deals with the decoupling techniques for processing data transmission and reception packets between CubeSat and ground station to enhance software reusability. Processing data transmission and reception packets which are coupled with the CubeSat communication protocol such as AX.25 and KISS is a critical step in a CubeSat communication with the ground station. Since processing data packets coupled with the communication protocol is highly dependent on the types of hardware used in the ground station, a source code for data packet processing in the ground station software must be modified or re-developed by hardware specifications if any hardware replacements are needed. In this thesis, the packet processing program was newly-designed on the basis of the decoupling techniques and was tested with COSMOS, an open-source program for the ground station. The packet processing program was separately placed and interfaced with the COSMOS to receive data packets from the CubeSat and transmit data packets to the CubeSat. A series of successful communication demonstrations between the CubeSat and ground station clearly shows that the packet processing program developed as part of this study can successfully remove the hardware dependency from ground station software and thus improve its reusability.