1. Andrew Bourgeois Aaron Minard

2.  Background  Satellite Tracking  SatPC32  Problem Statement  Solution  Mechanical Design  System Diagram  Electrical Design  Software  Schedule  Budget

3.  VTC developing Cubesat, transmits data  Have to follow Cubesat to receive data  Existing 3-meter parabolic dish antenna  Low orbit satellite revolves around earth in minutes, seen for short time per orbit  Many existing solutions  EGIS Bi-axial antenna positioning system  BIG-RAS Azimuth and Elevation Rotator

4.  Equipment-Gesellschaft für Internationale Elektronik Systeme  Cost:  Software $400  Data Interface $1,100  Hardware $2,700 (EL-40°, AZ-180°)  Extension $2,200 (EL-90°, AZ-360°)  Rotor Hardware Mount $400  Satellite Dish Mount $400 ▪ Total $7,200

5.  A free software available online for tracking satellites. Updates on screen and controls rotor to point to position satellite  Uses orbit of satellite and observer position  Many types of rotors to select for output  Uses Serial port or Parallel port on PC

6. Screen Shot of SatPC32 in use WinListen predicts path

7.  Track a low orbit satellite such as a CubeSat from horizon to horizon is as little as 30 seconds 180°/30 seconds=6°/sec  Move a 3 meter satellite dish  360° Azimuth (left/right)  90° Elevation (up/down)  Interface to PC running SatPC32  Integrate/improve previous design

8.  Gears and motors, motor controllers  Freescale Coldfire 32-bit Microcontroller  Serial interface with SatPC32 using EGIS controls and a serial port  Position sent as ASCII Characters  :P AZ=123.45  :P EL=009.87  Magnetic Encoders measure position of dish  Use/Modify existing designs for elevation and azimuth control

9.  Maybe some Azimuth (talk about using last years stuff that was good?)  Maybe a whole slide summarizing last years model and then discussing what we liked (Azimuth) and what we thought needed improvement (Elevation)  We liked work gears for both… why? (speed)  Discuss around here about the wind force calculations….? Angular acceleration…. ?

10. Specified previously  1° step size = at least nine bit resolution 2 9 = 512 steps 360 deg/512 steps =.7 deg/step  6°/sec = 1 rpm (6°/sec)(60sec/1min)(1rev/360deg)  Magnetic shaft encoder  Absolute position sensing  Small size, large operating temperature range  Analog output from 10-bit DAC ▪ 1024 steps or.35°/step

11. Micro- controller EL - Motor Controller AZ - Motor Controller Limit Switches RS232 SatPC32 Position Encoders

12. Position Encoders ACAC Motor Controller 12Vdc 10Amp FUSE 5Vdc regulator Micro- controller A E Circuit Protection 12Vdc 10Amp FUSE PC Running SatPC32 Limit Switch

13.  Decide where to turn, how fast  Read new position from serial port  Stores values when they come in  Read actual position from encoders  Measure periodically  Always checking limit switches  If ever activated, stop motors Controller (Set Outputs) New Serial? Check Encoders? Read Serial Read Encoders

16. Week 1Week 2Week 3Week 4Week 5Week 6Week 7Week 8Week 9Week 10Week 11Week 12Week 13Week 14 Mechanical Final Mounting of all Electrical Coldfire Peripheral Boards Power Supply Wiring Motor Drivers to DC Motors Sensor Wiring/Positioning Software SatPC32 Research Serial Port Code Encoder Code Motor Controller Code Code Integration Testing

17. Week1Week2Week3Week4Week5Week6Week7Week8Week9Week10Week11Week12Week13Week14 Mechanical Final Mounting Electrical Coldfire Peripheral Boards Power Supply Wiring Motor Drivers to DC Motors Sensor Wiring/Positioning Software SatPC32 Research Serial Port Code Encoder Code Motor Controller Code Code Integration Testing