May I ask for some help in converting to rinex??
I took some measurements with a Trimble R4(first generation) and now i want to convert them to rinex so as import them in GNSS Solution.
I saw that you can download from Trimble's site ,the Convert to Rinex software.
In the software there are 2 possibilities for file extension, YYO/YYN/YYM and .obs/.nav/.met.
Is there a difference? which i choose??
Also in measurement point, the usual is to put ARP or APC?
Something that confuse me is about antenna.If I put ARP , it has by default antenna offset -0.065m.I suppoose in APC it must be 0. Also in the the bottom of the receiver it writes nomimal offset distance from antenna phase center 0.065m.
But when i go to NGS site to antenna calibration,( i think the appropriate antenna for R4-model 1 is antenna TRM5800) in drawing it shows 0.065m but in ANTINFO file it has 74.8mm for L1 center and 77.3mm for L2 center. whats happening here?
In GNSS Solution when you import the rinex, the antenna must be calibrated in the way of ANTINFO file and the amount of 0.065m, insert it as negative height of receiver over point.
thanks for any helpp!!
YYo/YYn,YYm If You Send To OPUS
YearYearObservation/Navigation/Meteorlogical or
Three separate files file.15o file.15n file.15m
You only send file.15o to OPUS
OPUS does not care what antenna data you have in the RINEX file, you must separately tell OPUS the antenna model and antenna height to ARP in meters.
ARP is the antenna Reference Point, i.e. the bottom of where the antenna mount threads are. APC is the Antenna Phase Center, i.e. somewhere in the antenna. The minus number tells you the ARP is below the APC.
Other software needs it in the RINEX and they can usually handle it in either format.
Paul in PA
> Something that confuse me is about antenna.If I put ARP , it has by default antenna offset -0.065m.I suppoose in APC it must be 0. Also in the the bottom of the receiver it writes nomimal offset distance from antenna phase center 0.065m.
>
> But when i go to NGS site to antenna calibration,( i think the appropriate antenna for R4-model 1 is antenna TRM5800) in drawing it shows 0.065m but in ANTINFO file it has 74.8mm for L1 center and 77.3mm for L2 center. whats happening here?
My guess would be that the drawing is wrong. It's showing 65mm to the L1 Phase Center and 10mm from the Phase Center down to the mark on the edge of the receiver.
If it were 65mm to the mark on the edge of the antenna and 10mm up from there to the L1 Phase Center, the distance would be 75mm (=74.8mm) to the L1 Phase Center.
Absolute vs. Relative?
M
> Absolute vs. Relative?
>
> M
The older relative calibration data doesn't seem to support that.
Here's the relative calibration on the TRM5800 antenna which gives a height of 93.0mm from the ARP to the L1 Phase Center (unless I'm misreading this):
[pre]
TRM5800 NONE Receiver+Antenna NGS ( 3) 02/12/05
0.2 1.5 93.0
0.0 1.6 3.4 5.0 6.5 7.9 9.1 10.0 10.6 10.9
10.8 10.3 9.4 8.2 6.5 4.5 2.1 0.0 0.0
0.2 -1.6 84.9
0.0 -0.9 -0.6 0.4 1.8 3.4 4.8 6.1 7.0 7.3
7.2 6.6 5.4 3.8 2.0 0.0 -1.9 0.0 0.0
[/pre]
as compared to the current (well actually, it's dated 2025) absolute calibration for the same antenna:
[pre]
TRM5800 NONE Antenna inside TRIMBLE 5800 and TRIMBLE IGS ( 3) 11/03/25
0.8 1.1 74.8
0.0 1.4 2.5 3.1 3.3 3.3 3.1 2.9 2.7 2.7
2.7 2.9 3.2 3.7 4.2 5.2 6.6 0.0 0.0
0.1 -2.2 77.3
0.0 -1.0 -1.1 -0.7 0.0 0.8 1.4 1.9 2.2 2.1
2.0 1.7 1.4 1.0 0.7 0.5 0.9 0.0 0.0
[/pre}
hmmm, i think little difficult to have made a mistake in NGS site...maybe relative and absolute...
0.065m May Be The Manufacturer's Estimate...
...prior to NGS testing.
Paul in PA
0.065m May Be The Manufacturer's Estimate...
The older Trimble antenna files I have for the 5800 antenna give values that match those shown on the sketch, i.e. L1 Phase Center 64.9mm above ARP and L1 Phase Center 9.7mm above the center of the bumper.
[pre]
[R8/5800/SPS78x]
Name=R8/5800/SPS78x Internal
DCName=R8/5800/SPS78x Internal
Manufacturer=Trimble
Class=Survey
PartNumber=
CharCode=K4
Type=97
MeasMethod0=0.00000,0.06490,0.00000,"Bottom of antenna mount"
MeasMethod1=0.09100,0.00970,0.00000,"Center of bumper"
RINEXMethod=0
RINEXName=TRM5800
RINEXName=TRMR8
RINEXName=TRMSPS780
RINEXName=TRMSPS781
PhaseCorrTable=t5800.pct
NGSCorrTable=t5800.ngs
Freq=2
LowVoltage=1
Internal=1
GraphicsFile=5800.jpg
[/pre]
The offsets shown in the Trimble "Convert To RINEX" library are the Trimble manufacturer offsets, as with most manufacturers, these will not exactly match the NGS derived ones either absolute or relative.
Because of this, unless ONLY using Trimble equipment, I would use the NGS antenna calibrations and if with NAD83(2011) use the absolute ones.
I am a Leica user and I imported ALL of the NGS corrections into my software and use those rather than the built in library.
Not sure if there is any way to use the NGS calibrations within Trimble software products, easy with Leica and I can even put the NGS calibrations on the hardware to have them for use during field data collection.
SHG
SHG, why you give an exception if someone using only Trimble? So ,if i understand well,it sounds to better using NGS calibrations.
About YYo/YYn/YYm and .nav,.obs.met are the same exactly files. Just the extension .obs/.nav/.met is used by tecq software. It does some checkings to rinex files,i dont know exactly.
I am just pointing out that trimble as well as other brands come up with their own antenna offsets which is why the NGS offsets are slightly different, I only use NGS so I will have consistency when mixing and matching different equipment.
SHG
YYo = observation files
YYn = navigation files
YYm = meteorological files
Not sure what the question is?
SHG
when you use Convert to rinex,the latest ver. , it has 2 options about file extension.
YYo/YYn/YYm and .obs.nav.met. Both are the same ,just the name change for recognize them from different software
OK