[FOSS-GPS] RE: Post-processing RINEX to simulate RTK

Mauro Ugarte Avilés mauro.ugarte at cefop.udec.cl
Wed Oct 26 17:41:02 EDT 2011

On 26/10/11 14:35, António Pestana wrote:
>     "3.3 Configure Input, Output and Log Streams for RTKNAVI"
> That is invaluable information for me. I'm becoming a RTKLIB fun but 
> I'm a civil engineer with no knowledge of data network technology.

Regarding that chapter, you should use as your network topology, the 
example 4 (Wifi) or 5 (mobile phone network), and replace on both of 
those examples the block "RTKNAVI" by Spider (and maybe move Spider to 
the "Base Station" or reference receiver's PC, and "STRSVR" to the 
remote receiver's PC) . If there is going to be line of sight between 
both locations, a Wireless Router or Access Point connected at the Base 
Station's PC Ethernet port (or wirelessly), an a USB wireless adapter 
with detachable antenna at the rover's PC (this one, for example: 
http://www.tp-link.com/en/products/details/?model=TL-WN722N), with both 
antennas (the AP/router and the USB adapter) replaced by a directional 
Wifi antenna like this one: 
should do it. (Note that the antenna does not include the coaxial cable 
needed to connect the antenna to the AP/router (that by the way has to 
have a detachable antenna also, in order to replace it), but that cable 
can be easily found on computer stores). The USB wireless adapter used 
at the remote receiver's PC should be placed inside the box behind the 
antenna, were the RP-SMA connector is.

>     All the options and configuration for RTKPOST and RTKPLOT are
>     described and exemplified on RTKLIB manual.
> Well... At that point I have to disagree with you. The options (and 
> there are many options) are listed and very briefly described. Almost 
> never exemplified and never explained. You must have a strong 
> background on GNSS positioning techniques to fully understand most of 
> the options at user diposition.

My fault, no examples...but at least RTKLIB has a manual....and there 
are screen captures on it!! At the GNSS positioning techniques FOSS 
world, those features are not very usual... ;-). Based on that brief 
descriptions, you would be able to find better explanations somewhere 
else: papers, doctorate theses, GNSS equipment manufacturers, etc.

> I'm having trouble in learning the differences between position modes 
> (Options - Setting 1, namely static, moving-base and fixed)...

You will be sensing large structures, right? In that case, I would go 
with "static" (static rover, static reference), not "moving-base" 
(moving rover, moving reference) nor "fixed" (constant distance between 
rover and base). Maybe you could go with kinematic too, if the real-time 
displacements and deflections of the structures studied can be 
considered as "movement".

> ...and between integer ambiguity resolution (Options - Setting 2).

I think I never fully understood this option, I can't give you a better 
explanation than that stated on the manual, so if anyone has a better 
understanding of it please enlighten us.

Best regards,

Mauro U.

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