• Author: Matheoud Alessandro Valentino
  • Description:

    This thesis is devoted to the development of a bidirectional telecommunication system for
    space applications. The module is going to be integrated in the AraMiS architecture, that is
    an innovative philosophy of small satellites based on tile-modularity and the use of low-cost
    commercial components.
    The objective is to design the electronic board, the antenna apparatus and the control
    software to handle both the communication protocol and the housekeeping functions. According
    to the AraMiS specications, the main constraints are collected in Table I.
    Frequency Rate PTXsatellite PTXground Interface On board supply Size
    437 MHz 9:6 Kbps 33 dBm 47 dBm SPI [12 􀀀 18] V; 15 W 165×165 mm2
    After an introduction referring to space-environment related issues and the state of the
    art in university satellites, the hardware design is carried out. Technical choices related to
    frequency selection, modulation and suitable equipment are taken and justied according to the
    power budget, project constraints and the availability of specic products on market. A set
    of devices is analyzed in terms of key-parameters in order to lter the most appropriate ones
    for each goal, then main block-schematics are provided. By means of specic CAD tools, both
    SUMMARY (continued)
    schematics and PCB implementation are performed and depicted in the following chapters, then
    the C++ control software is designed to drive the communication system, the processing unit
    and all the housekeeping sensors. Since only COTS components are going to be used due to
    the low-cost goal and those are neither space dedicated nor radiation robust, both protection
    circuits and specic software routines must be implemented in order to keep electronic boards
    in safe operating region. Such a precaution is fundamental to prevent the mission failure in
    case of SEUs. After that, the propagation environment is studied and the most common UHF
    radiating systems for satellite-ground communications are described. Finally, a suitable AraMiS
    antenna and specic microwave circuits are designed to ensure both impedance matching and
    high radiation eciency in the band of interest.
    In order to assure the system compatibility within the AraMiS framework and full technical
    integration with the other subsystems, a UML description for the entire project documentation
    is developed and steadily updated in the project library.

  • Year: 2013
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