[FOSS-GPS] Configuring a NV08C for rtklib

[Artyom G]

Hi Fred,

USB port can output BINR data too. You can use "BM control" programm (
http://navis.ru/assets/images/prog_ob/BM_Ctrl_V0430.zip ) to switch from
NMEA to BINR. Or you can find in the documentation special command that
changes NMEA to BINR and send them yourself.

RTKlib works with "raw data" from nv08c (pseudorange+pseudophase and
ephemeris data). By default these messages are turned off in the receiver.
So you have to send special BINR commands to activate them. BINR protocol
is published by receiver manufacturer:
http://www.nvs-gnss.com/support/documentation/item/download/39.html .

All descriptions in internet of how to connect nv08c to RTKlib copy
settings that can be found here:
http://www.onetalent-gnss.com/ideas/usb-hw-receivers/denga10 (
http://www.onetalent-gnss.com/ideas/usb-hw-receivers/denga10/rtklib242b4_mb.zip?attredirects=0&d=1).
You can copy settings of the nvs_raw_1Hz.txt or nvs_raw_10Hz.txt to the cmd
window of input stream.

But if you use the latest version of RTKlib you can use commands that are
more readable. In the RTKlib manual on page 11 there are commands that
rtklib supports for nv08c:

!NVS ... : NVS NV08C binary command
!NVS CFG-PVTRATE [arg...] configure PVT rate
!NVS CFG-RAWRATE [arg...] configure raw data rate
!NVS CFG-SMOOTH configure smooth range
!NVS CFG-BINR xx [...] send binary command for NVS
(input hexadecimal series)
!WAIT time : wait for time (ms)

So in the cmd window of input stream you can simply print something like:
!NVS CFG-PVTRATE 1
!WAIT 1000
!NVS CFG-RAWRATE 1

And you will get 1HZ raw data stream to RTKnavi.

You can check that RTKnavi is receiving raw data by clicking on the button
"RTK monitor" and then choosing "Obs data" or "Nav GPS" or "NAV GLONASS"
and you should see there observations, GPS ephemeris and GLONASS ephemeris
respectively.

Regards,
Artyom


On Wed, Sep 23, 2015 at 8:39 PM, Fred Labrosse <ffl at aber.ac.uk> wrote:

> All,
>
> I am not quite new with RTKLIB (I have used it at some point with a pair
> of Yuan10 receivers).  We have just taken delivery of 2 NV08C evaluation
> kits (NV08C-EVK-CSM) and tried to use rtklib.
>
> So far not much success.  The first issue is that we finally realised that
> the USB port only sends NMEA by default.  So we switched to the D9
> connector that does send BINR data.  Clearly rtklib is receiving the data
> (the data display window in NVS BINR mode shows regular lines with a
> message type and length), but no processing is happening (solid rather than
> flashing processing “LED” in rtknavi and no solution data displayed or
> logged).  The receiver do get a fix, according to the NMEA we get on the
> USB port.
>
> The documentation seems to indicate that what data we want to get has to
> be configured, but we have not yet found a way to do that.  Any chance
> anybody has managed that could share info please?
>
> Cheers,
>
> Fred
>
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