During my ground tests, I found that the velocity measurement (in North-East-Down format) of UBlox GPS is not accurate as I expected. The experiment is like this:
1. fix a UBlox GPS unit on a trolley, which is initially stationery;
2. move the trolley forward with a relatively constant speed (about 1 m/s);
3. Stop and check data.
I found that the recorded velocity is liked a bounded but random signal, osillating in the range of -1~1 m/s (yes, I observed even the -1 value at some points). May I know that have you guys encounter a similar problem, and how did you solve it?
If possible, can someone tell me how about the accuracy of the MediaTek GPS's velocity measurement. I roughly remember that it only gives course velocity. If so, based on the measured Euler angles, can I have the North-East-Down velocity vectors?
Many thanks for the help and suggestions from all of you!!
No one has ever encountered the similar problem before!?
Many thanks for sharing some experience!
Hi Chris, many thanks for your suggestion. I will do the test and get back to share the result.
Many thanks for your suggestion and the illustration. I will change the setting accordingly and let you know whether the performance is improved.