UT ASE 463Q - Command and Data Handling Subsystem (12 pages)

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Command and Data Handling Subsystem



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Command and Data Handling Subsystem

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Pages:
12
School:
University of Texas at Austin
Course:
Ase 463q - Satellite Solutions CubeSat Design

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2 0 Command and Data Handling Subsystem The Command and Data Handling Subsystem is the brain of the whole autonomous CubeSat The C DH system consists of an Onboard Computer OBC which controls the operation of the CanSat The OBC has software installed that manages the programs written to handle various tasks for example a program whose function is to create a telemetry stream will read the status of the payload sensors and then encode the telemetry stream The same program can further control the flow of the data from sensors to the temporary memories inside the microcontroller in the event of communication restrictions such as the blocking of communication signals between the CubeSat and the ground station This section begins with a discussion of the C DH Subsystem of the previous CanSat group Further subsections discuss the requirements and constraints for the CubeSat followed by the choice and evaluation of microcontrollers The last subsection discusses the modifications made to the hardware and software of the previous CanSat 2 1 Background The previous CanSat had an OBC for C DH The primary component of the OBC was the microcontroller AT90S4433 The secondary components were EPROM and RAM These components were used for storing the software and were built in to the microcontroller The software was written in C language that performed only one loop to run all subsystems A separate function was written in C language to make the OBC accept commands from the ground station and to override any operating function during the falling phase of the CubeSat All programming was done with the help of an STK 500 programming board shown in Figure 1 Figure 1 STK 500 AT89S AT90S Series Flash Microcontroller Starter Kit Compass Lab 2003 The following paragraphs discuss the advantageous as well as the flawed C DH design considerations of the previous CanSat Advantageous Design Considerations Control of Payload Sensors Control of Communication Subsystem Ability to transmit Telemetry



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