Replies to This Discussion

DeveloperPermalink Reply by Michael Oborne on July 28, 2012 at 1:15am

IS this for a tlog or a log?

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Permalink Reply by Jon von Weymarn on July 28, 2012 at 1:32am

I meant tlog files... Don't know about another file format in MP.

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DeveloperPermalink Reply by Michael Oborne on July 28, 2012 at 1:35am

look under

gps_raw_int

uint16_t eph; ///< GPS HDOP horizontal dilution of position

 

 

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Permalink Reply by Jon von Weymarn on July 30, 2012 at 12:14pm

Yeah there it is! Thanks!

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Permalink Reply by Jon von Weymarn on August 3, 2012 at 12:29pm

To answer my own question if someone else needs this info...
Other logs are for example the onboard logs which are enabled via CLI (logs --> Enable XXX)

More about these at http://code.google.com/p/arducopter/wiki/AC2_Datalogging

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Permalink Reply by Daniel Portillo on August 9, 2012 at 4:44am

Hi, this is some offtopic, do you know what HDOP value is acceptable for fly?, I can't find this info, thanks

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Permalink Reply by Jon von Weymarn on August 9, 2012 at 4:57am

I am not completely sure so someone correct me if Im wrong:

HDOP alone if not enough to decide if you have a good signal. You also need to take into account Sat Count.

• IF you have enough satellites, say 7-10 for me usually, AND you also have a HDOP of under 100 --> GOOD SIGNAL.

• If HDOP is over 150 with 7-10 sats i usually wait for it to get lower.
• If i have less than 7 sats i usually wait for a few more regardless of HDOP.

Best I've seen is 11 sats with a HDOP of 78. I fly in Finland so I'm quite high up on this planet we call home. Smarter people have told me that GPS does not work as well here as somewhere closer to the equator.

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Permalink Reply by Daniel Portillo on August 9, 2012 at 5:13am

Ok, thaks. I think that this is a very important safely parametrer that may be in wiki First-time flying checklist.

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Permalink Reply by Jon von Weymarn on August 9, 2012 at 5:25am

I agree.GPS (and Sonar) interference would also be valuable in the assembly wiki. My first GPS placement was close to my telemerty Xbee which resulted in some GPS jumps. Moved GPS further and solved it.

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