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Mr.RC-Cam

Inertial-navigation system uses silicon sensors

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The latest issue of EDN has a technical white paper on a Inertial-navigation system that uses silicon sensors. It has a CXL04M3 (Crossbow) 3-axis acceloerometer and three CG-16D (NEC/Tokin) gyros. The online paper includes the software listing for determining position and velocity data.

This may be of interest to those of you that are into developing UAV electronics. Details are here: Inertial-navigation system uses silicon sensors

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This article makes you think it is easy to build INS. My experience is that it is far from that. It may be fairly easy to build one but to make it work right is much longer story.

For example - theoretically correct statement that displacement is second integral of acceleration (and therefore one can do without GPS) is impossible to do in practice because of vibrations, drift, etc... Of course missiles/rocket navigation systems do it all the time but there we are talking several orders of magnitude different price range.

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Yes, even a single integration is already difficult, so let's imagine 2.. And you have to eliminate the earth's acceleration in every position...

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