3 questions :1) Is it possible to build a simple but accurate INS using a 3 axisaccelerometer and 3 axis inclinometer? Or do I need something morethan that? Is the inclinometer even needed or would just anaccelerometer surfice?2) Is a gyroscopic chip required to measure the yaw or can that behandled by the accelerometer above? Is it true that accelerometerscannot measure yaw but can measure pitch and roll only? Do I need a 3axis gyroscope as well in that case?3) If I am in a car parked on a hill, how does the INS know I'm notaccelerating forward but rather that the acceleration is just due togravity? This gets back to my question of whether an inclinometer isneeded I'm guessing.Crap I have not even started and its already sounding complicated.Please, a simple explaination only as I'm already somewhat befuddled.

You've got some of the basics but go back even further. You need away to pinpoint your position on earth and your initial vectors fromtrue north and flat/level with the surface of this accommodatingsphere known as earth.From that, three accelerometers will do the trick but there areother factors such as coreolis effect, drift of your accelerometers,and a means to keep the accelerometer platform stable. As you noted,a gyro will do that.--Ray

Inertial Navigation System - what do I need?

Dec 26, 2007 21 Replies

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Jim Stewart 18 years ago

Obligatory "The missile knows where it is" lecture...

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Rich Grise 18 years ago

I guess you'd have to see some representative shows. It's kind of like "stealth education" - these kids go on adventures and have to solve problems along the way to get to the goal. So they sit down and figure stuff out, and I suppose the kid (viewer) is supposed to solve it along with them. They ask each other leading questions and stuff.

It's probably for pre-schoolers, but my inner child likes it. :-)

And they have a variety of problems, from math to physics (the angle of incidence is equal to the angle of reflection), tesselation, and stuff that's within a kid's grasp.

Cheers! Roch

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