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Posted by e_correspondence on October 26, 2009, 4:43 pm


All-

Is it possible to calculate in realtime the horizontal accuracy (+/-
meters) of GPS positions from the NMEA strings? If so, it there a
formula or any guidance online that will help me calculate this?

I'm helping to write an application that would require the horizontal
accuracy from a GPS reciever to be display on a GUI.

Thanks in advance.

Posted by HIPAR on October 26, 2009, 5:57 pm


> All-
> Is it possible to calculate in realtime the horizontal accuracy (+/-
> meters) of GPS positions from the NMEA strings? If so, it there a
> formula or any guidance online that will help me calculate this?
> I'm helping to write an application that would require the horizontal
> accuracy from a GPS reciever to be display on a GUI.
> Thanks in advance.

Some Garmin receivers transmit the error estimate in a proprietary
NMEA sentence.

Estimated Error Information (PGRME):

$PGRME,<1>,M,<2>,M,<3>,M*hh<CR><LF>
<1> Estimated horizontal position error (HPE), 0.0 to 999.9 meters
<2> Estimated vertical position error (VPE), 0.0 to 999.9 meters
<3> Estimated position error (EPE), 0.0 to 999.9 meters

I've seen reference other NMEA sentences that might be helpful but I
have never seen them on consumer grade receivers.

--- CHAS




Posted by Sam Wormley on October 27, 2009, 12:04 am


e_correspondence wrote:
> All-
>
> Is it possible to calculate in realtime the horizontal accuracy (+/-
> meters) of GPS positions from the NMEA strings? If so, it there a
> formula or any guidance online that will help me calculate this?
>
> I'm helping to write an application that would require the horizontal
> accuracy from a GPS reciever to be display on a GUI.
>
> Thanks in advance.

See: http://edu-observatory.org/gps/gps_accuracy.html

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