Rover Positioning

The FIDO rover uses four systems to determine its location during surface operations.

All these measurements are tied together in what is called "State Fusion." That is the determination of the absolute position and attitude of the rover on the surface.

A graphing calculator and a CBL can be used for exploring the accelerations that occur around you, such as a car, an elevator, or a roller coaster. Acceleration is a change in velocity during a time interval. This change in velocity can either be a change in speed or a change in the direction of motion. Direction is indicated by the algebraic sign of the acceleration: a positive sign indicates increasing positive distances from the origin, while a negative sign indicates decreasing positive distances from the origin. For example, while riding in a car that leaves from a stop sign, you undergo positive acceleration. As the car slows to a stop, you experienece a negative acceleration.



  1. Connect and turn on the calculator and CBL. Start the PHYSICS application.
  2. Setup one LOW-G ACCELEROMETER using the stored calibration.
  3. Use the manual TRIGGERING option to collect data. This allows you to disconnect the calculator from the CBL.
  4. Orient the arrow in the direction you plan to take data (either horizontally or vertically) and zero the accelerometer.
  5. Enter a data collection rate (usually 0.5 seconds between samples is adequate).
  6. To begin data collection, disconnect the calculator and press the TRIGGER button on the CBL.
  7. Once the CBL displays DONE, reconnect the calculator and use the RETRIEVE DATA option.
  8. Time values (in seconds) will be stored in list #1 and accelerations (in m/s2) will be stored in list #2. An acceleration versus time graph will be displayed.



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