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" <[email protected]>
Sent: Friday, November 12, 2010 5:17 AM
To: <[email protected]>
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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