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

Tomoji TAKASU ttaka at yk.rim.or.jp
Wed Oct 26 19:35:39 EDT 2011

Dear Antonio and Mauro

Thanks for kind explanation, Mauro.

> 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.

It is hard to describe the details of ambiguity
resolution beyond the manual.

They take just different algorithms.

Please switch the option and select the
appropriate one for your environment.



From: "Mauro Ugarte Avilés" <mauro.ugarte at cefop.udec.cl>
Sent: Thursday, October 27, 2011 6:41 AM
To: "Open Source GPS-related discussion and support" 
<foss-gps at lists.osgeo.org>
Subject: Re: [FOSS-GPS] RE: Post-processing RINEX to simulate RTK

> 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:
> http://www.tiendecita.com/antena-wifi-planar-estanca-marca-abaks-p-99.html,
> 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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