The GPS got the FIX status, but the quality decreased to FLOAT when the rover was moving

Reach Module / M+ / M2 RTK / PPK configuration
1

First, Thanks for all your help, My GPS now got FIX status. But new problem came out:

When GPS was static (don’t move it), the GPS can get FIX status, and the accuracy was up to 5mm,

test3.jpg1366×768 183 KB

but when I moved it, even if at a very low speed, it switched to FLOAT status, the satellite signal was strong enough.

float.jpg1366×768 264 KB

And after I put the rover in a place for a while, it went back to FIX status.

For me I want to mount the GPS on a robot, and then get its position information when the robot is running. Now it seems like the GPS can not get FIX status for dynamic situation.

Appreciate any suggestions and help.

2

You were using static mode while moving?
Use kinematic when moving.
What setting are you using?

1 Like
4

Thanks.
I was using Kinematic mode when moving.
The settings are as following:

1.png978×1195 59.7 KB

5

Hi,

Which version of ReachView do you have?

Please post raw data logs and solution logs so that we can have a look at them.

6

Hi, the version I used is 2.4.2

The raw data is more than 10MB, it can not be uploaded. Would you have some other suggestions for sharing you the data

Thanks

7

Reachview version i 0.4.X something
2.4.2 is a RTKlib version

If you have dropbox, icloud or google disk etc, you can send link to file.

8

Thanks, I will do that.

9

Would you please give me your email, I can share you the data through Dropbox.

Thanks

10

Could you send link as IM to me ?

11

Thanks for your suggestion.
I have sent you the link through message.

12

Hi

A quick look at the post file, it look ok with 82% FIX solution
Could you tellus a bit more what you were doing when logging this file? walking with a pole or others…

You got som fluctuation with AP. I will take a closer look later.

13

Looks like you have some interference of some kind. but i get 92% fix at the best.
How is your groundplane ?

14

Hi, Thanks for your kind reply.

My ReachView version is v0.4.9.
I thought I was just moving the rover by hand when logging the file,and the base was static. I put the the rover in a plastic plate, as shown in the following figure.

IMG_2066.JPG1958×2611 1.95 MB

By the way, there was strong wind during my test. Does this factor affect the performance?

Thanks very much.

15

I assume you have a metal ground plate under the antenna? Also retry with a longer vertical distance (50cm or more) between the antenna and the equipment. You could have some interference from it.

16

I’m not sure whether there is metal underground, I will switch another place to test it again. I stick the antenna to a metal plate, shown as in the figure I posted just now, the antenna was put in the up left corner. is it the reason?

17

It could be. I quick test with the above comment will tell us that :slight_smile:
The important thing is to protect the antenna from surrounding noice

18

Did you do post processing for the 92% FIX status. Since during my test, once I moved the rover, the gps switched to FLOAT status, and when I put the rover in a fixed place, several seconds later, it went back to the FIX status. I would like to mount the gps on a robot, and let robot run in the field, so what I want to achieve is the GPS can maintain FIX status when my robot is moving.

I really appreciate your help. Thanks

19

Yes.
It should work.