Hello,
I succesfully built a Base-Rover system with twoF9P breakout boards, two Artemis Redboards, Lcd screens and SD card reader, and the two communicate via LoRa radios flawlessly, sending RTCM and allowing to achieve RTK-Fix position with the rover, after surveing-in with the Base.
Image:
https://drive.google.com/file/d/1R0gZ4r … ulloy/view
I then tried to post-process the logged data with RTKLib, through the RtkExplorer fork, to perform PPP.
The steps I took are as Follows:
o Enabled logging of base RXM-RAWX and RXM-SFRBX to SD with the Artemis.
o Downloaded the *.ubx file to the PC and converted it with “RTKConv” utility to *.obs, *.nav and *.sbs files.
At this point the “RTKPlot” utility successfully shows the reception of satellite pseudoranges (Also, u-center shows them as RAWX and SFRBX messages in the original .ubx files").
o Downloaded "*.sp3 ephemeris and *.clk satellite clocks with “RTKGet” covering my raw data acquisition period.
o Opened “RTKPost” and set it as follows:
-
The converted “.obs” file in the “RINEX OBS” input
-
The converted “.nav” file in the input below
-
The downloaded".sp3" file in the next input
-
The downloaded".clk" file in the next input
-
The converted “.sbs” file in the last input
I set “PPP Static” and “Precise Ephemeris” in the Setting1 tab, and “Single” as Solution for static mode in the Output tab.
However I get “Q=0” during processing and the generated *.pos file is empty:
% program : RTKPOST ver.demo5 b34b
% inp file : C:\Users\Matteo - Fisso SSD\Desktop\Test UBX\vecchi\12111129.obs
% inp file : C:\Users\Matteo - Fisso SSD\Desktop\Test UBX\vecchi\12111129.nav
% inp file : C:\GNSS_DATA\2187\igr21876.sp3
% inp file : C:\GNSS_DATA\2187\igr21876.clk
% inp file : C:\Users\Matteo - Fisso SSD\Desktop\Test UBX\12111129.sbs
% obs start : 2021/12/11 11:28:46.0 GPST (week2187 559726.0s)
% obs end : 2021/12/11 16:52:07.0 GPST (week2187 579127.0s)
% pos mode : PPP Static
% solution : Forward
% elev mask : 15.0 deg
% dynamics : on
% tidecorr : on
% tropo opt : SBAS
% ephemeris : Precise
% navi sys : GPS GLONASS Galileo QZSS BDS
% antenna1 : ( 0.0000 0.0000 0.0000)
%
% (lat/lon/height=WGS84/ellipsoidal,Q=1:fix,2:float,3:sbas,4:dgps,5:single,6:ppp,ns=# of satellites)
% GPST latitude(deg) longitude(deg) height(m) Q ns sdn(m) sde(m) sdu(m) sdne(m) sdeu(m) sdun(m) age(s) ratio vn(m/s) ve(m/s) vu(m/s) sdvn sdve sdvu sdvne sdveu sdvun
I put a link to the original “.ubx” reconding and ask if someone could kindly check it and confirm if it contains al the necessary data to perform PPP:
https://drive.google.com/file/d/18dZEIA … sp=sharing
If it does then, what is that I am missing in the post-processing?
Thanks in advance