ViaSat Mentor_ Dr. Chuck Pateros David Casterton Team

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    Agenda
    Gantt Chart
    Flow Chart
    GPS
    Demo
    Summary
    Next Week




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      Gantt Chart
    Tasks         Wk1   Wk2   Wk3   Wk4   Wk5   Wk6   Wk7   Wk8   Wk9   Wk10 Wk11
Research
Order Parts

Paper Design

Write Pointing
Calculations
Design/Assemb
le Sensors
Write
Interface
Assemble
Pointing Device

Debug

Test/Revise

Final Pres.

Document

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        Pointing Device Flow Chart
                                        GPS
                              Acquire Long/Lat from GPS

                                            Bluetooth

                          Input Long/Lat into Lego NXT




                                        NXT
                              Compute Azimuth & Elevation




                                        NXT
                                Point towards satellite

    Attach satellite on NXT
                                                          Manually point antenna
    to automatically point
       towards satellite                                    towards satellite
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    Global Positioning System
     Constellation of 27 earth-orbiting satellites
     Satellites’ orbits are set so that at any time and place
      on earth, there are at least 4 satellites visible
     GPS receiver will locate at least 4 of these satellites




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    Howstuffworks.com
                        GPS Satellite Constellation




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    Global Positioning System
     The GPS receiver will figure out its distance to
     each satellite by receiving high-frequency, low-
     power radio signals from the satellites
     The GPS receiver can then calculate its position by
     trilateration




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    Trilateration
     Distance from
      receiver to satellite is
      the radius of sphere
     Our Location is at the
      intersection of of all
      three spheres




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    Demo




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     Demo




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     Summary
      Fixed direction of magnetic declination offset
      Research GPS




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     Next Week
      Recontruct pointing device
        Compass needs to be leveled out in order to read
         correctly
      Refine program
        Right now, accelerometer needs to be zeroed after every
         run




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