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

Wed Apr 30 10:59:39 PDT 2014

You should also be able to provide a startup message for RTKLIB to send to
the receiver.  I use it with str2str and if I recall rtkrcv / RKNAVI
support it as well.  For ublox it looks like:

!UBX CFG-RATE 1000 1 1      # set update period in milliseconds
!UBX CFG-MSG 2 17 0 0 0 1   # RXM RAW - required for rtklib
!UBX CFG-MSG 2 16 0 0 0 1   # RXM SFRB - recommended for rtklib
!UBX CFG-MSG 240 0 0 0 0 1  # NMEA GGA
!UBX CFG-MSG 240 1 0 0 0 0  # NMEA GLL
!UBX CFG-MSG 240 2 0 0 0 0  # NMEA GSA
!UBX CFG-MSG 240 3 0 0 0 0  # NMEA GSV
!UBX CFG-MSG 240 4 0 0 0 1  # NMEA RMC
!UBX CFG-MSG 240 5 0 0 0 0  # NMEA VTG
!UBX CFG-MSG 240 8 0 0 0 0  # NMEA ZDA

The first two numbers of each CFG-MSG line define the message, and the
following 4 0s and 1s turn that message on and off for different interfaces
(usb, serial, etc)

-Josh

On Wed, Apr 30, 2014 at 1:46 PM, Danny Miller <dannym at austin.rr.com> wrote:

> 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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