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Thread: Gyro

  1. #1
    Constant Bitrate weekendowel's Avatar
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    Gyro

    Is this:
    http://www.cs.unc.edu/~vicci/comp261...300_prelim.pdf

    a possible solution for being able to navigate when the GPS sgnal is low? Itīs a bit expensive about 600$ but maybe there are a cheaper solution?

  2. #2
    Maximum Bitrate wi77iam's Avatar
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    This will give you stabilized magnetic heading - one of the ingredients that you need to compute a dead-reckoned (DR) position. The other ingredient is ground speed, which this won't supply. So you either use the last known gps-supplied speed or add an independent speed source (obdii, doppler, etc.)

    Those two things plus the right algorithms will allow you to DR a position when your gps loses track.
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  3. #3
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    Trust me, Stick with the GPS.. Unless you really know what you are doing, DR is no joke and I wouldn't trust that gyro system to work properly. I work with gyro systems that cost anywhere from $300,000 minimum to $3,000,000 for Dead Reckoning and to be honest, we still go back to use GPS because it is faster and more accurate. When we are laying a plot we are only traveling at about 3-5 MPH, try doing your calculations at about 60MPH+ then.. Gyro's just are not pratical.....

  4. #4
    Constant Bitrate weekendowel's Avatar
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    But how about the navigation system that are premounted from the car factory, how do they work?

  5. #5
    Raw Wave Laidback's Avatar
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    Quote Originally Posted by weekendowel
    But how about the navigation system that are premounted from the car factory, how do they work?
    Yeah? They don't just rely on GPS, and they don't cost $300,000!


    Did you see this thread?

    OEM GPS Modules.

  6. #6
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    Ummm, They are talking about GPS standards... They all use GPS, there are just different STANDARDS of GPS, Like there are different standards of DVD ie: DVD +R -R +/- R......

  7. #7
    Maximum Bitrate DeltaFX's Avatar
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    I may be wrong about how do nav systems deal with dead reckonnig, but if it is assumed the car is still on a road and follows the planned route, such a gyro system tied with 2D accelerometer might be enough for few seconds of DR. No ?

  8. #8
    Raw Wave Laidback's Avatar
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    Quote Originally Posted by kenski
    Ummm, They are talking about GPS standards... They all use GPS, there are just different STANDARDS of GPS, Like there are different standards of DVD ie: DVD +R -R +/- R......
    Well the link wasn't for you actually, it was for weekendowel. Anyway, What standards?? They're just talking about different GPS modules but if you read it all there is this...

    Quote Originally Posted by edikp
    @nl4jy: I've been eye-ing ublox modules for a while too. Which one you plan on purchasing? The TIM-LR or SBR-LS? From what I've read so far those two have DR capability and reasonable prices.
    Go to Ublox website and you can see modules that have options for dead reckoning and a giro to fit from €50! I just wanted to point out that they're cheaper than $600, don't know if they're as good though!

  9. #9
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    digital compass is too expensive in that case heck you can build one for cheaper. i have even found setups that can produce an accurate measure of direction in degrees of up to plus or minus 1 degree. all are done of of simple schematics and a few basic chips. i believe in the idea of building for 20 dollars rather than spending hundreds to thousands of dollars for simple stuff. check this out http://discovercircuits.com/D/direction.htm

  10. #10
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    if anyone needs schematics for anything just ask i might have what u need i got a 250GB HD nearly full and others i might be able to sketch out from scratch.

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