Can anyone repeat my version?
1 Like
I have older skytraq, but even when you upload newest firmware, you still have to choose which types of satellites you want your device to see. So set for example the four types: GPS, glonas, beidou and Galileo. I don’t know which is set as standard/default for your rover device.
And off course set same in base.
1 Like
Above I wrote that if I disable any one RTCM message then my rover does not reach fix RTK.
The same happens when I disable constellation.
1 Like
That’s very strange. RTK should be possible with only GPS RTCM messages. Certainly it should be possible with only GPS, Glonass, and Galileo. Beidou is an incomplete constellation. I don’t even bother with it at present. My F9P base station is only transmitting GPS, Glonass, and Galileo observations and my PX1122R gets RTK quickly and reliably. I am not sure what firmware version it is. Can check later. Also I haven’t yet tried setting to 5 or 10 Hz but I don’t expect any issues.
Edit: my base station messages are: 1005, 1077, 1087, 1097, and 1230. And I’ve been told 1230 isn’t even required at all on modern receivers. I’ve not bothered to disable it yet but I plan to.
1 Like
It seems to me that no one uses the PX1122R as a base and Rover.
“satellite Galileo drift” on BS RTK affects the fix RTK for the rover?
1 Like
@fazm. First I must admit I was wrong about the settings of a skytraq rover, it seems to be set from factory. Although I found a place in gnss viewer where you can disable qzss (maybe to get higher Hz nmea output)
But it seems to be difficult to keep a fix, but it does not explain why you are not able to change base settings without going to only float.
Perhaps try msm7 as torriem does.
In following link you see others having problems with skytraq.
1 Like
There ARE settings for rover:
http://www.navsparkforum.com.tw/viewtopic.php?f=39&t=1867&p=5792&hilit=rover+constellation#p5792
User guide for GNSS Viewer:Documents — NavSpark
1 Like
Thanks Larsvest, I studied the information on the links, I did not find a solution to my problem.
I enabled “Survey mode” on the RTK base yesterday and set the observation time to 36000 sec. It has been more than 12 hours, the measurement has still not stopped.
If I set the measurement duration to 60 seconds, the measurement stops.
The user manual shows the time in seconds.
RTK base mode
Saved Opt. Function: Survey Mode
Saved Survey Length:36000
Standard Deviation:30
Run-time Opt. Function: Survey Mode
Run-time Survey Length:4294860533
1 Like
If it does not stop surveying in, and 12 hours is gone, then you did not get within 30 cm precision. Your picture also shows that you got around 80 cm in that time. I just used 300 sec and 30 cm. It works as base for f9p. The long time surveying should be send in for calculating precision point
1 Like
I think I found the reason, it seems that my used antenna only has the L1 band or the L2 is broken. My used antenna is not labeled.
To give you an example:
In the RTCM 1074 of my BS RTK “Skytraq”, there are only messages:
MT1074 ToW 128366.0000 Signal L1_C/A
In RTCM 1074 commercial BS RTK “TRIMBLE BD970”, the messages:
MT1074 ToW 128585.0000 Signal L1_C/A
MT1074 ToW 128585.0000 Signal L2_Z-Track
MT1074 ToW 128585.0000 Signal L2C(M+L)
MT1074 ToW 128585.0000 Signal L5_I+Q
I need to check my guess
1 Like
Please check the antenna again.
Andrew Hsu from SKYTRAQ team thinks the L2 deficiency is the problem.
Thank you esprtk for your prompt reply.
Now I have replaced the antenna with 2J7C01MC2F L1L2.
And the RTCM messages have the range L1, L2, G1, G2.
MT1074 ToW 183078.0000 Signal L1_C/A
MT1074 ToW 183078.0000 Signal L2C(L)
MT1084 ToW 193859.0000 Signal G1_C/A
MT1084 ToW 193859.0000 Signal G2_C/A
but I have not tested it yet, I will publish the result soon.
Hi,
After my test, when Base disable SBAS.QZSS or rejoin SBAS, QZSS, it will reboot, the rover drops from rtk
fix to normal gnss fix or float, then the rover needs to take some time to re-resolve ambiguity, in my case
around 60 seconds to regain RTK fix. It can remain RTK fix after regain RTK fix.
Below, picture, the left is Rover, the right is Base, Base TX wired to Rover RX.
Your receptions of L2 on the rover receiver is not good, no L2 actually for RTK.
Did you do a cold start on the Rover after the base disable SBAS and QZSS at runtime? Was the rover able
to get RTK fix? though, in my test, I did not do a cold start.
Best regards,
Andrew
These are picture posts, so you can find them in a search.
You can move it to your own message.
1 Like
I copy and paste your comment to this room to ask Skytraq team :
https://www.navsparkforum.com.tw/viewtopic.php?f=39&t=1917
We are still waiting for your result.
So, I got the results (PX1122R ).
My assumptions about the antenna were confirmed.
The problem was the antenna, the antenna was working in the L1 band.
In the user guide “GNSS-Viewer-User-Guide.rev0.2.pdf” there is no information about controlling the L1/L2 or L1 band.
Set GNSS to RTK base mode “RTK” - “Configure RTK Mode And Operational Function”.
My antenna is super strange!!!
Set GNSS to RTK base mode “RTK” - “Configure RTK Mode And Operational Function”, only L1.
Set GNSS to RTK rover mode “RTK” - “Configure RTK Mode And Operational Function”, L1 and L2.
1 Like
My recommendations configuring GNSS PX1122R RTK base mode.
First, execute “Binary - Set Factory Default”.
Identify constellations with many satellites.
Don’t forget to save your changes in flash “Update to SRAM+FLASH”
I selected GPS, GLONASS, BEIDOU.
Then “Venus8”. - “Configure GNSS Constellation Type”
Then select the RTCM messages according to the selected constellations “RAW” - “Configure RTCM Measurement Data Out”.
Next, switch GNSS to RTK mode “RTK” - “Configure RTK Mode And Operational Function”.
Then do cold start.
1 Like
My recommendations configuring GNSS PX1122R RTK rover mode.
First, execute “Binary - Set Factory Default”.
Don’t forget to save your changes in flash “Update to SRAM+FLASH”
Select output interval of navigation message “Binary” – “Query and Configure NMEA Message Interval”, in seconds.
Configure Position Update Rate, “Binary” – “Configure Position Update Rate”
Configure GNSS Constellation Type, Selected GPS, GLONASS, BEIDOU “Venus8”. - “Configure GNSS Constellation Type”
Next, switch GNSS to RTK rover mode “RTK” - “Configure RTK Mode And Operational Function”.
Then do cold start.
My region is on the border of Europe-Asia, the visibility of the satellites is limited by the Ural Mountains, it was also snowing during testing, so I turned on all the constellations for a stable RTK fix.
1 Like
Very good work, and now we have a manual for setting up skytraq base and rover. But I have a question. Is the interval in seconds or Hz? Rover output is preferred to be 10 Hz for AOG.
1 Like
Interval in Hz, as in the image.
High frequency “Position Update Rate” requires more constellations to fix RTK.
A setting of 1 Hz is suitable for static measurements or very slow driving with fewer constellations.
1 Like
I don’t see the hz mentioned after gga interval, which is set to 1
1 Like