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GPS Hz?

Discussion in 'Android Devices' started by 0100, Jun 15, 2011.

  1. 0100

    0100 Newbie
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    Could someone tell me at what Hz the GPS runs at in the X?

    Also if someone know what the X2 and incredible GPS runs at that would be awesome.

    Thanks!
     

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  2. binary visions

    binary visions Android Expert
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    So... GPS is not a transmission protocol for consumers. You can receive the signal, but not transmit. Thus, the phones don't really "run at" that frequency, they receive it.

    All phone receive on the same frequency, and Wikipedia informs me that GPS transmission is 1.57542 GHz (L1 signal) and 1.2276 GHz (L2 signal).
     
  3. 0100

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    Oh I see. I figured phones could do 1-5hz maybe even 10hz some day in the future. I guess I need to get one of those external GPS receivers that can run 10Hz.

    Thanks for the info!
     
  4. nsa_sailor

    nsa_sailor Android Enthusiast
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    The GPS Status & Toolbox program has settings for 1,5 & 10 Hz. I think its probably a function of how much processing time you want to dedicate.
     
  5. gbynum

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    Ah, you are looking at update rate. As nsa says, that app can be set for 1, 5, and 10. I __BELIEVE__ that the US government limits non-military to 10Hz. Unless you are using it for navigation control, I don't know why anything more frequent that 1Hz is useful; what (if I may ask) are the advantages to you of the faster update?
     
  6. binary visions

    binary visions Android Expert
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    Ohh.. I see. You were asking about the polling frequency. Sorry, I misunderstood. Ignore me :)
     
  7. nsa_sailor

    nsa_sailor Android Enthusiast
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    I'm curious as to how they would control that. I'm thinking it's a feature of the receiver, not the transmitter.
     
  8. binary visions

    binary visions Android Expert
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    It is, but any devices like this (including GPS receivers) have to pass FCC approval. So technically, someone could probably homebrew a higher frequency receiver, but since they won't pass FCC, they can't be sold on the market.
     
  9. 0100

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    How do you get to the GPS Status & Toolbox program to get to the Hz settings?

    Thanks!
     
  10. nsa_sailor

    nsa_sailor Android Enthusiast
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  11. 0100

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    doh I didn't think it was an app.

    Thanks!!
     
  12. 0100

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    Ok sorry last question.

    I downloaded the app but can't find an area in the settings to change the Hz.

    The only thing I have found is Settings>GPS & Sensors>Sensor filtering and you can pick weak medium or strong filtering.
     
  13. nsa_sailor

    nsa_sailor Android Enthusiast
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    Settings > Display & Tools > Screen refresh rate.
     
  14. 0100

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    Thanks! I see it now. Not sure that adjusts the Hz though, I think that is screen rate.
     
  15. nsa_sailor

    nsa_sailor Android Enthusiast
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    You might be right.
     
  16. 0100

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    Yeah, either way thanks for your help, much appreciated.
     
  17. gbynum

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    As binvis said, it is. There were, back in the dark ages when I began playing with GPS, long before they had built in maps, several "rules" IIRC. They couldn't update more rapidly than 0.1 sec, they couldn't operate if a simultaneous elevation and velocity were exceeded. I THINK the height was 20,000 meters and velocity was 1000 km/hr. This was to limit the usefullness for weapons delivery. Several manufacturers hard limited speed and elevation rather than the simultaneous requirement ... easier ... and who other than a jet or shuttle pilot would care. There was an acceleration and "jerk" (rate of change of acceleration) limit, too, again IIRC ... if you need to know, the GPS newsgroup still is active and there are real experts there.
     
  18. nsa_sailor

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