[FOSS-GPS] RTKLIB: How to use it to develop a cheap DGPS basestation?

[Tomoji Takasu]

Dear Mauro

> I was trying to follow your code, looking for the step where the 
> PseudoRange Correction and the Rate Range Correction (PRC[m] + RRC[m/s]) 
> are generated for each satellite (based on the raw data from the device 
> used as base and the fixed position of it) before being feed to the 
> solution computation for the rover position (when using DGPS mode), but I 
> couldn't find it.

Current version (2.4.0) does not include RTCM output for
DGPS or RTK base station. Please use receiver raw
proprietary messages for this purpose at this moment.

I will add RTCM output function in the future version for raw
pseudorange and carrier-phase. I have not decided whether
to support RTCM 2 PRC-type DGPS correction for many
existing receivers. If many requests, I will consider it.

regards,

********
Tomoji TAKASU
WWW: http://gpspp.sakura.ne.jp


--------------------------------------------------
From: "Mauro Ugarte Avilés" <mauro.ugarte at cefop.udec.cl>
Sent: Friday, November 12, 2010 5:17 AM
To: <foss-gps at lists.osgeo.org>
Subject: [FOSS-GPS] RTKLIB: How to use it to develop a cheap DGPS 
basestation?

> Dear Tomoji,
>
> DGPS base stations are much more expensive than some well known receivers 
> that can output raw data, and considering that RTKLIB can use that data 
> and correct the pseudoranges of a rover, I was thinking if it is possible 
> to use those corrections to output them as RTCM SC-104 messages, thus 
> developing a cheap DGPS base station using, for example, some decent 
> antenna, an u-blox 5T and RTKLIB with some addition.
>
> I was trying to follow your code, looking for the step where the 
> PseudoRange Correction and the Rate Range Correction (PRC[m] + RRC[m/s]) 
> are generated for each satellite (based on the raw data from the device 
> used as base and the fixed position of it) before being feed to the 
> solution computation for the rover position (when using DGPS mode), but I 
> couldn't find it.
>
> Can you please give me some advice at where to look on RTKLIB code for 
> that computation step? Any other suggestion, tip or comment about what I'm 
> trying to do will be more than welcome.
>
> Best regards to you and all list members,
>
> Mauro Ugarte A.
>
> PS.: For those of you wondering why do I want to use DGPS in the first 
> place, is because here in Chile there is nothing like WAAS, and I need to 
> increase accuracy on pedestrian rovers on rural areas, where the ammount 
> and quality of the data required for RTK are unachievable with small GPS 
> antennas and variable RF links.
> --
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