[FOSS-GPS] Raw Data from NEO-6M

[Danny Miller]

Be sure to increase your serial port baud rate.

There's MUCH longer packets, and more of them, than data than NMEA 
fixes.  In my experience if there's too much data it just overruns the 
buffer and data gets lost.  The link is full of errors and the fix 
disappears.

It may appear fine early on after power-up.  But as more satellites get 
added, the data gets longer and longer, and you may oddly lose the fix 
as it becomes "good".

You can also disable data you don't need to keep the link bandwidth down.

The graphical interface of U-Center allows you to turn on/off msg types 
for each port.  It'll be saved if you have a battery on the GPS, which 
you should to maintain the RTC.

Danny

On 4/30/2014 12:16 PM, Scott Harrison wrote:
> Leor,
>
> You have to go into U-Center and enter the following custom message:
>
> to enable RXM-RAW
>
> b5 62 09 01 10 00 c8 16 00 00 00 00 00 00 97 69 21 00 00 00 02 10 2b 22
>
> to enable RXM-SFRB
>
> b5 62 09 01 10 00 0c 19 00 00 00 00 00 00 83 69 21 00 00 00 02 11 5f f0
>
> This will turn on the raw data you need, but it is stored in RAM so
> you will need to resend the codes every time you power up.
>
> Also, set your type to PPP and then you should start to see sub-meter
> accuracy with RTKLib.
>
> see http://wiki.openstreetmap.org/wiki/RTKLIB
>
>
> Scott
>
> On Wed, Apr 30, 2014 at 7:56 AM, vbenso <vbenso at gmail.com> wrote:
>> Leor,
>>
>> It's been a long time since I don't touch my GPS hardware, so I could be
>> wrong. That being said.
>> As far as I remember, rtklib needs more information than just UBX-RXM-RAW in
>> order to obtain an accurate fix. The neo6m should send another message
>> (maybe RXM-SFRB?) that I wasn't able to get from the receiver.
>> I could get ordinary gps precision in static and single modes of rtklib.
>> Good luck, and in case of any development let me know.
>>
>>
>> Victor A. P. Benso
>> Sementes Benso
>> Major Vieira - SC
>> (47) 9922-9599
>> (47) 3655-1192
>>
>>
>> On Mon, Apr 28, 2014 at 4:49 PM, leor [via Open Source GPS-related
>> discussion and support] <[hidden email]> wrote:
>>> I got 2 CN-06 (neo6m) recievers to output into RTKlib both over serial
>>> COM. Problem is that I have not been able to get a fix and always get a
>>> single status. Also whenever I choose static it seems to change everytime I
>>> start it. Using dgps and kinematic gives me an accuraccy of around 50m. I
>>> have tested this indoors and managed to get RAW data. Any idea how it would
>>> perform outdoors? I am trying to collect data to creat GCP for use in ortho
>>> correction
>>> [IMG]http://i.imgur.com/kj3Z5IV.jpg[/IMG]
>>>
>>>
>>> Great info you guys have. I got it to work but I am not sure what kind of
>>> accuracy I will be getting
>>>
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>>
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