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1.2 Sojourner Rover. Photo courtesy of NASA

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                                  Measuring sinkage in Martian soil
                                  Logging vehicle performance data
                                  Determining the rover’s thermal characteristics
                                  Tracking rover imaging sensor performance
                                  Determining UHF link effectiveness
                                  Analysis of material abrasion
                                  Analysis of material adherence
                                  Evaluating the alpha proton X-ray spectrometer
                                  Evaluating the APXS deployment mechanism
                                  Imaging of the lander
                                  Performing damage assessment

                                Sojourner was controlled (driven) via telepresence by an Earth-
                                based operator. The operator navigated (drove) the rover using
                                images obtained from the rover and lander. Because the time delay
                                between the Earth operator’s actions and the rover’s response was
                                between 6 and 41 minutes depending on the relative positions of
                                Earth and Mars, Sojourner had onboard intelligence to help pre-
                                vent accidents, like driving off a cliff.
                                                       Team LRN
            Chapter one
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