Integration of a Software-Defined Baseband for Nano Satellites

Abstract: The number of Nano satellites launched into space is increasing rapidly each year. All satellites need a ground station with a baseband to communicate with. Current commercial basebands for TT&C (telemetry, tracking and command) are using proven designs and are too expensive to be used for Nano satellites. This thesis investigates the feasibility to use a SDB (Software-Defined Baseband) for TT&C with Nano satellites in low earth orbit. It describes the making of a transceiver which is validated with simulated data,recorded data and live satellite passes. It also describes the implementation of a GPS (Global PositioningSystem), TCR (Time Code Receiver) and TCP/IP (Transmission Control Protocol/Internet Protocol)interface as well as the process of testing for EMC (Electromagnetic Compatability) requirements. A half-duplex transmit/receive system is also proposed. The SDB functioned acceptable for telemetry with Nano satellites with up to 90% of the data packets being received depending on which satellite that wasbeing tracked. The SDB needs further development, validation and certification to compete with today’scommercial basebands.