BTW , is the survey in process set to finish when it reaches an accuracy of 1 mm by default or can it be changed ??
By default, survey-in is not configured, it is either configured by ground station (as a parameter in Mission Planner, hard coded in QGC) or by user.
The survey process can be set with Ucenter, and saved permanetly in configuration .
When youāll connect the base NEO-M8P to the ground station you can check with Ucenter when the process ends and then connect with MP or QGC with the rover NEO-M8P and inject base datas .
I usually connect at first the base NEO-M8P to the ground station while Iām preparing the drone , making pre flight checks etc
When I start MIssion Planner after a couple of minutes the survey process is already finished and ready for injection.
Thatās how I do too
I wait for the survey-in to be successfully finished but once I start QGC, it starts from the top.
With MIssion Planner it does not happend .
QGC restart the survey process , ask the developpers if there is a way to stop it.
I think it is hard coded in QGC
Will check with the developers
BTW any way to check the accuracy in QGC, with response to drone location ?
Does u-center have any sort of plotter to show show the base and rover and to measure its accuracy ??
There is a tool called āDeviation Mapā that plots points in U-Center. You also have access to the 3D accuracy which is an estimator of the positioning precision.
When the injection process is going on, we could connect a uart to usb converter on the telem port of the BASE and have access to u centre right?
This is correct. Be careful to not apply several power supplies to the module though.
I connected the drone though mission planner and did gps injection through the "RTK/GPS inject " option and was able to get a fix within 2-3 mins (max). Was able to measure the accuracy too.
Some doubts with Mission planner RTK/GPS inject option
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I believe M8P portion with āSurvey Accā and āTimeā is for survey in mode while Base position button is for setting the fixed base location
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What kind of MSG will occur in SVIN during the process, I was getting a:
Survey IN Valid: True InProgress: false Durationā¦"
I would suggest that you first install the most current MP version 1.3.45. That includes a few bug fixes and enhancements to RTK.
SurveyIn: true and InProgress: false means that you hav set a valid base point and the system is ready to send corrections to rover.
If you want to record a new base point, then you need to clear the entry Enter Base Position dialogue box.
Then status will be Surveyin: false and InProgress: true after you connect the base module.
Surveyin Acc: defines the min accuracy and Time the minimum time the system is surveying. Both conditions need to be true before a base point is recorded.
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Could we wait for the survey-in process to be over in u-center( where the base shows status as TIME) and then inject using mission planner ? in the case, will the survey-in process in MP start all over again ?
No in MP the survey process will not start again .
During GPS injection a USB - UART converter to the TELEM port or Rover port of the base rtk module
Should I untick āM8P autoconfigā in the RTK/GPS Inject setup ?
In Mission Planner it does no difference if the base has complete the survey process.
Once configured with Ucenter , I just connect the base to the notebook of the ground station , after some minutes the survey is finished then I connect the drone with Mission Planner, inject the rtk data, wait for the red led to blink , when the led is stedy read you are done.
Thatās is how I do too and it has worked quite successfully.
I guess we could use āM8P autoconfigā feature for setting the survey-in process through MP ?
If you use the drone telemetry to inject rtk correction via Mavlink, the base will be connected only with usb cable