Static vs rtk NTRIP

[Del Maxfield]

Anyone know why my static observation of a point does not check very well with rtk NTRIP observation of same point? I am using android mobile tools 2.9.1. Both observations give an rms of about .01 m. The rtk position differs from the static by about 1 foot horizontal and 3 feet vertical.

 

[David M. Simolo]

The first things I would be looking at is to make sure that each datum and antenna height calculation is the same. Then I would look at repeatability of the same difference.

 

[Del Maxfield]

The first things I would be looking at is to make sure that each datum and antenna height calculation is the same. Then I would look at repeatability of the same difference.

Thanks. I will double check datum and heights. I think they were. Do you mean repeat observations of the same point?

 

[David M. Simolo]

Yes Del. Not sure how desirable the field conditions are at the point you were measuring but thought you might want to rule out just a fluke due to poor observation data.

 

[Del Maxfield]

Ok. Thx Dave

 

[Alexey Razumovsky]

Get a point with known coordinates and check a solution.

 

[Del Maxfield]

Ok. I believe my static position was good. I had observed another point nearby. Both points were occupied for more than 2 hours. Obtained both dpos and opus on them. Ran traverse between them with excellent results both h and v. I do have an NGS point not too far away that I can occupy. So I will give that a try next. Thx.

 

[Adam]

Hi Del, feel free to give me a call. 704-477-3603

 

[Del Maxfield]

Thx Adam. Are you using jmt on android ? I just saw that it has been updated to 2.9.4. Have you experienced the same problem?

 

[Adam]

I have not, please try with update and let us know if it's working correctly.