design_final_c

design_final_c - EMFFORCE OPS MANUAL Space Systems Product...

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EMFFORCE OPS MANUAL Space Systems Product Development-Spring 2003 C Avionics Hardware Design (SS) C.1 Avionics Board Interfaces It is essential to identify the interfaces in order to ensure a complete and functioning Avionics/electronics subsystem. The primary role of the Avionics subsystem is to integrate all hardware and software of the system; therefore, the Avionics hardware must interface with all other subsystems. Central to the Avionics subsystem is the Tattletale Model 8 computer. The Avionics team has chosen to utilize the Tattletale Model 8 computer (TT8), with Motorola CPU (Central Processing Unit) and TPU (Time Processing Unit), because it both suits project processing needs and is readily available in the Space System Laboratory. This computer interfaces directly with four other pieces of hardware: The Metrology computer, the voltage regulator, the Communications board, and a series of mosfets used for power amplification purposes. This hardware conceptual layout is depicted in Figure C.1-A. RWA Powe r Amp Computer (CPU/TPU ) Comm./Ops PW R V Reg. RS 232 Metrology Sensors Metrology Preprocess o PWR (D) EM Figure C.1 -A: Avionics Hardware Interfaces Each hardware interface is necessary and vital to each EMFFORCE vehicle. The necessity for these interfaces is explained as follows: The Metrology computer is another Tattletale Model 8 computer. The Avionics subsystem must allow for the sending of Primary Vehicle Array (PVA) updates through a serial channel from the Metrology TT8 to the main Avionics TT8 computer. Massachusetts Institute of Technology 1 Dept of Aeronautics and Astronautics
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EMFFORCE OPS MANUAL Space Systems Product Development-Spring 2003 The Power team is responsible for the voltage regulator. However, the Avionics team is responsible for the interfacing between the voltage regulator and the rest of the system. The voltage regulator allows for a steady 5V power to come from the AA batteries to the Tattletale computers and the Avionics board. The Power and Operations teams shall address any other power concerns and notify the Avionics team in a timely manner such that any new concerns can be addressed properly in the system design. The communications/operations hardware is the hardware that allows for the sending and receipt of all data being transmitted and received from the immediate vehicle system to the Avionics TT8 and vice versa. The Communications board interfaces with the Avionics TT8 through a serial RS232 cable connection. A circuit design of mosfets, like the voltage regulator, is the responsibility of the
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design_final_c - EMFFORCE OPS MANUAL Space Systems Product...

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