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Navigation With Inertial Navigation Systems
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In May 2002, the PFC went to Capitol Forest to
navigate through the woods with no tape, no chain, no compass,
and no GPS. We came back with data of survey level accuracy.
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How did we do this? With an inertial navigation unit
provided by the Applanix Corporation of Richmond Hill,
Ontario. Because of inconsistent satellite reception under
forest canopy, making GPS unreliable, PFC has been
investigating inertial navigation systems which use gyroscopes
and accelerometers to calculate which direction the user
travels and how far. |
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We are now processing that data, but we had great initial
results in the field. We were able to find a wooden survey
stake that was put in 3 years ago, but had become obscured
by grass. The Applanix unit was able to identify the location
of the stake and within minutes of digging in the grass we
found the stake.
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The Applanix inertial navigation unit indicated the original
survey stake was in this clump of grass, a little digging
proved that it was. The stake on the left was a guess after
the original stake was obscured. |
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Joel Gillet from Applanix with the inertial navigation backpack
unit on. The staff he is holding is for balance when doing
a zero velocity update. |
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