Designing CubeSat communication sub-system in UHF-VHF bands and systemizing satellites in S-band

The developed communication system is equipped with dual-frequency bands, namely UHF and VHF, enabling seamless communication links with ground stations for the transmission and reception of data. This system is structured as a constellation of satellites, where each satellite independently shares information with others within the network. In instances where a satellite loses connection with the ground station and is outside its direct line of sight, the satellites within the constellation collaborate by transferring data amongst themselves using the S-band frequency until one of them establishes a connection with the intended ground stations. The selected communication protocol for this system is AX.۲۵, a widely utilized standard in nano-satellite communications. AX.۲۵ offers four distinct modes, ensuring robust data transmission and minimizing the risk of data loss. To facilitate communication for each satellite, dedicated transmitters and receivers are implemented, tailored to the specific protocol requirements. The AX۲۱۵۰ model is employed for S-band communication, whereas the AX۱۰۰ model is utilized for UHF and VHF band communications, thereby ensuring a comprehensive and versatile communication infrastructure for the entire satellite constellation.

کلیدواژه ها:

CubeSat ، Satellite ، S-band Antenna ، UHF & VHF Band ، Communication Protocol