[FOSS-GPS] RTKlib help pls

Bud Asterisk budasterisk at gmail.com
Tue Nov 19 18:24:39 PST 2019


Why I like RTKNAVI to start is that you can plot what the data is giving
you and you will see a FLOAT wander around and eventually tune into itself
and FIX. You may want to take a generic GPS reading at your location and
use that as the position of the base. It should help get to FIX quicker.
Not sure I understand why, but it made a difference for me.

On Tue, Nov 19, 2019 at 9:07 PM drwho <drwho at infidigm.net> wrote:

> I let rtkrcv run for a while.  I briefly was in fixed mode with 8
> satellites.  Tomorrow night I'll head to the county where I usually get 10
> satellites.
> On 2019-11-19 8:59 p.m., drwho wrote:
>
> My setup is two OemStar receivers.  One is connected via serial port, the
> other is through a relay server and a 3g modem.  I removed the IP address
> of my server from the file and replaced it with ip_of_server.  The OemStars
> only support gps + glonass (pos1-navsys=5).  I think these are the only
> changes from the stock conf file.
> On 2019-11-19 8:45 p.m., Bud Asterisk wrote:
>
> I can take mine outside tomorrow if the weather holds and see how long it
> takes. IIRC it was 4 birds in the sky and took a minute. I should have
> taken better notes on my trials and tribulations to get it working since I
> am still learning lots. I know at some point I had to set an approx start
> location for the base station otherwise it would never get to FIX from
> FLOAT. Even though conceptually it should. My $0.02 is to use RTKNAVI first
> till you can get a FIX as it is much easier to see what is going on. And
> then take your working conf and use rtkrcv.
>
> Oh also I used 2 pots from the kitchen as ground planes under the antenna.
> Need to get to WMT for something cheap this weekend.
>
> Can you post your *.conf file you used?
>
> On Tue, Nov 19, 2019 at 8:38 PM drwho <drwho at infidigm.net> wrote:
>
>> I gave rtkrcv a try from https://github.com/rtklibexplorer/RTKLIB demo5
>> branch and voila, I get a float solution now!  No more no
>> double-differenced residual after 7 weeks of struggling!  Thank you so much
>> for pointing out rtklibexplorer.  Now onto getting a fixed solution.  Any
>> idea about how many valid satellites are required for a fixed solution?
>> I'm getting 7 right now in the city, overcast....
>>
>> # of satellites rover       : 11
>> # of satellites base        : 10
>> # of valid satellites       : 7
>>
>> 2019/11/20 01:37:22.00 G07 1 23543275.469        0.000
>> 123720746.574         0.000  2914.1     0.0 37  064 0
>> 2019/11/20 01:37:22.00 G08 1 22171781.133        0.000
>> 116513507.383         0.000  3244.9     0.0 45  0 0 0
>> 2019/11/20 01:37:22.00 G09 1 21126139.602        0.000
>> 111018592.926         0.000   448.3     0.0 38  064 0
>> 2019/11/20 01:37:22.00 G16 1 20963946.320        0.000
>> 110166281.117         0.000 -2187.3     0.0 46  0 0 0
>> 2019/11/20 01:37:22.00 G21 1 25155113.438        0.000
>> 132191029.602         0.000   141.0     0.0 31  064 0
>> 2019/11/20 01:37:22.00 G23 1 20989052.875        0.000
>> 110298206.492         0.000 -1256.4     0.0 35  0 0 0
>> 2019/11/20 01:37:22.00 G26 1 22904042.680        0.000
>> 120361516.371         0.000 -2944.8     0.0 46  064 0
>> 2019/11/20 01:37:22.00 G27 1 20758214.352        0.000
>> 109085174.746         0.000  1349.3     0.0 47  064 0
>> 2019/11/20 01:37:22.00 R14 1 20121058.617        0.000
>> 107256576.695         0.000 -1320.0     0.0 44  0 0 0
>> 2019/11/20 01:37:22.00 R15 1 20369659.602        0.000
>> 108849285.676         0.000  1616.6     0.0 38  0 0 0
>> 2019/11/20 01:37:22.00 R23 1 21825182.789        0.000
>> 116750015.395         0.000 -1661.8     0.0 46  0 0 0
>> 2019/11/20 01:37:22.00 G08 2 22171770.695        0.000
>> 116513422.930         0.000  3245.4     0.0 30  064 0
>> 2019/11/20 01:37:22.00 G09 2 21126127.297        0.000
>> 111018526.246         0.000   448.2     0.0 39  0 0 0
>> 2019/11/20 01:37:22.00 G16 2 20963933.781        0.000
>> 110166180.230         0.000 -2187.4     0.0 47  0 0 0
>> 2019/11/20 01:37:22.00 G21 2 25155108.125        0.000
>> 132190973.727         0.000   140.0     0.0 42  0 0 0
>> 2019/11/20 01:37:22.00 G23 2 20989045.883        0.000
>> 110298167.875         0.000 -1256.6     0.0 36  0 0 0
>> 2019/11/20 01:37:22.00 G26 2 22904033.281        0.000
>> 120361469.652         0.000 -2944.8     0.0 44  064 0
>> 2019/11/20 01:37:22.00 G27 2 20758202.812        0.000
>> 109085095.344         0.000  1349.2     0.0 48  0 0 0
>> 2019/11/20 01:37:22.00 R05 2 20871721.062        0.000
>> 111571326.961         0.000 -1165.9     0.0 33  0 0 0
>> 2019/11/20 01:37:22.00 R14 2 20121049.281        0.000
>> 107256486.191         0.000 -1319.6     0.0 47  064 0
>> 2019/11/20 01:37:22.00 R24 2 20960371.930        0.000
>> 112084524.137         0.000  1858.1     0.0 40  064 0
>>
>> Jon
>> On 2019-11-19 5:13 p.m., Bud Asterisk wrote:
>>
>> OK gang.....good news!
>>
>> I used the latest source for rtkrcv from rtklibexplorer's repo and
>> compiled it on my google cloud instance. Also used my conf file I had
>> working in rtknavi since it had been tweaked for me. Here is my setup. 2
>> CSG M8T boards, each connected to a Raspberry Pi Zero W. They have str2str
>> compiled and streaming the data to the google VM of rtkrcv.  Attached is a
>> screencapture of 3 terminals, 2 of the PI and one of the rtksrv output
>> stream of the rover location. Sorry I blacked out the IP and location info
>> for security reasons. Right now the antennas are in my window facing south
>> so it is only a float solution that comes and and goes. Not sure it
>> attachments will make it through the list....
>>
>> Bud
>>
>> Oh here is a cut and paste of the output stream. IP and location info has
>> been fudged
>>
>> 2019/11/19 22:12:40.000   21.134425586  -42.963204887   452.7045   2   4
>>   0.2230   0.1686   0.5208  -0.1212  -0.1373  -0.1447   1.00    0.0
>>
>> Right after the elevation of 452 you can see the "2" as solution type
>> which is enumated as float.
>>
>>
>> On Tue, Nov 19, 2019 at 9:13 AM drwho <drwho at infidigm.net> wrote:
>>
>>> On 2019-11-19 8:35 a.m., Bud Asterisk wrote:
>>> > I will try the CUI code from here:
>>> >
>>> > https://github.com/rtklibexplorer/RTKLIB
>>> >
>>> > Is this what you are using as well? His binaries on windows work for
>>> > me to get FIX.
>>>
>>> The rtkrcv I have been using is from
>>>
>>> https://github.com/tomojitakasu/RTKLIB.git
>>>
>>> branch = 2.4.3b33
>>>
>>> http://www.rtklib.com/ points to this git repo.
>>>
>>> I'll try the rtkrcv from rtklibexplorer tonight
>>>
>>> Jon
>>>
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>>
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