[FOSS-GPS] RTKLib rover - base question

[Daniel Kranich]

See Comments Below
On 7/24/2012 4:44 AM, Osterman, Aljaž wrote:
> Dear all,
>
> I've received several comments from different people. Thank you. Unfortunately there is still no solution to my problem.
> As proposed I tried several things:
> 1 - applied latest patch
> 2 - took base station data as correction input
> 3 - recorded input streams for rover and base
>
> I changed the hardware set-up to simplify the case. Now both receivers are connected via usb to my computer. They don't move. My first question is which positioning mode should be used for evaluation/best precision?  DGPS/DGNSS, Static, Fixed ...? I hope my questions are not too stupid.
Ok so if you want to just run a single rover, you should use PPPstatic. 
That will give you best precision with no base station.

However, if you have a base station then you should try the following:
1) start up RTKnavi on the base station computer and run the PPPstatic 
for 12-24 hours. Then take the final coordinates and write them down. 
(dont move your base station antenna as you have now determined the 
location of your base)

2) run strsvr.exe on the base station computer. set the input as you 
would for rtknavi. then set the output as TCPserver and put in a random 
port number. I used 5000. figure out the IP of your base station computer.

3) plug your rover into your rover computer. start up RTKnavi on your 
rover computer. set up the rover for a Single solution. Also turn on the 
base station and select TCPclient as the input type. Then for the option 
add the ip of your base station computer and the port you set.

4) go into the options and under the "Positions" Tab. The lower half is 
where you can input the coordinates of your base station. If you are 
using degrees and seconds then use the "Lat/Lon/Height (deg/m)" or if 
you have degrees that are decimal then use the "Lat/Lon/Height (dms/m)" 
and the others are rather self explanatory. You dont need to mess with 
the antenna Type.

5) Start it up and see how it works.
> I tried some modes but results were strange meaning that normally the solution was only single but for example with fixed mode position went to N 89 59 59.99 E 180 00 00 H -6335368 ...
> Can anybody comment on #2 above? Is this a correct way or are base data meant to be used as input stream for base station?
>
> Finally, I logged streams from rover and base. I was able to open and display both with u-center. With RTKPost I successfully opened the one from rover but the other from base contained no data after transformation (file .pos has only the header). Interestingly the original ubx files  for rover and base had different sizes (for the same length of time): rover - 1605 kB, base - 447 kB.
not sure why this would happen...
>
> Also I noticed some strange behavior of RTKNavi. After some time of running it starts sticking - for shorter or longer periods of time there's no change in calculated position with no new points plotted. Afterwards it resumes (calculates and plots again). Normally if I stop and start the program again everything looks normal (as if some buffer gets full and needs to be emptied from time to time). My signal from satellites is ok so this shouldn't be a problem.
This happens to me also, however it doesnt seem to be much of a problem
>
> And I still haven't obtained the coordinates to fix the position of my base.
follow steps above for this
>
> Regards,
> Aljaz
>   
> ____________________________________

Best Regards,
--
Daniel Kranich
Northern Utility Services