Replies to This Discussion

DeveloperPermalink Reply by Michael Oborne on July 8, 2012 at 5:03am

its either a poor gps fix, or imagery in your area is realy out.

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Permalink Reply by den on July 8, 2012 at 5:16am

But the same SIFR II GPS positioning RIGHT in MegapirateNG,Maybe In APM2 settings something wrong...

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Permalink Reply by Aleksey Kharlanov on July 9, 2012 at 6:45am

MPNG 2.6 R5 uses different NMEA library due to GPS error in original lib.

This issue described at http://code.google.com/p/ardupilot-mega/issues/detail?id=416&q=gps

We uses latest Greg Nash's library version.

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Permalink Reply by den on July 9, 2012 at 7:34am

When I replace AP_GPS_NME.h and AP_GPS_NMEA.CCP in AP_GPS , flash the 2.6 firmware,an error :

ArduCopter:254: error: cannot declare variable 'g_gps_driver' to be of abstract type 'AP_GPS_NMEA'
C:\Users\Monchhichi\Documents\Arduino\libraries\AP_GPS/AP_GPS_NMEA.h:52: note: because the following virtual functions are pure within 'AP_GPS_NMEA':
C:\Users\Monchhichi\Documents\Arduino\libraries\AP_GPS/GPS.h:87: note: virtual void GPS::init(GPS::GPS_Engine_Setting)

How to solve?

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Permalink Reply by Aleksey Kharlanov on July 9, 2012 at 7:42am

Greg version is not ready for 2.6, Try my version from MPNG, www.siralex.info/files/AP_GPS.ZIP

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Permalink Reply by den on July 9, 2012 at 7:54am

Thank you very much, use  your file to replace the the original file, and reflash arducopter 2.6 again , MAVLINK1.0 connect to Mission Planner 1.196, that the positioning normal .

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Permalink Reply by den on July 9, 2012 at 8:04am

But after update firmware,GPSHDOP this value reach 179X, is this normal?

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Permalink Reply by Aleksey Kharlanov on July 9, 2012 at 8:08am

HDOP reported by GPS and depends on Sat count and signal quality...

What is 179X ?

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Permalink Reply by den on July 9, 2012 at 8:09am

GPSHDOP=1790 OR 1794.....

DeveloperPermalink Reply by R_Lefebvre on July 8, 2012 at 6:11am

Have you compared the position reported by the GPS with a real GPS?  As Michael said, could just be the imagery in your area, but I've never seen anything that bad.  Man, I thought 10m was a lot...

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DeveloperPermalink Reply by Michael Oborne on July 8, 2012 at 6:30am

the only other thing i can think of is the nmea mode driver changed recently

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Permalink Reply by den on July 8, 2012 at 7:41am

The problem is that the same GPS in MegapirateNG any version of firmware positioning in Mission Planner are correct, but the GPS switch to APM2 arducopter 2.6 firmware on a positioning offset, I don't understand what's wrong.I have modify the GPS baudrate 4800 in 2.6 firmware at SYSYTEM.INO , do not know where also need to modify?

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