| Science Forum Index » Geology - Satellite Navigation Forum » Calculating Horizontal Accuracy from NMEA strings... |
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| e_correspondence... |
 Posted: Mon Oct 26, 2009 10:43 am |
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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. |
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| HIPAR... |
| Posted: Mon Oct 26, 2009 11:57 am |
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On Oct 26, 4:43 pm, e_correspondence <austin.tx... at (no spam) gmail.com> wrote:
[quote]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.
[/quote]
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 |
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| Sam Wormley... |
| Posted: Mon Oct 26, 2009 10:04 pm |
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e_correspondence wrote:
[quote]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.
[/quote]
See: http://edu-observatory.org/gps/gps_accuracy.html |
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