Filter big data simulink or matlab

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mike
mike on 17 Mar 2018
Edited: Greg Dionne on 29 Jun 2018
Hi I have the data in the image below :
and I tried smoothing and/or filtering, but had no luck to get a reasonable result. My goal is to get rid of all the spikes in the blue and make the plot similar to the red line much as possible. Any idea of the best method to that? The image below is for zoomed data
and the attached image is for the all plot:

Accepted Answer

Greg Dionne
Greg Dionne on 29 Jun 2018
Edited: Greg Dionne on 29 Jun 2018
hampel should get you started
plot(hampel(OutAIS.Data))
If you need something fancier, take a look at the diff of your signal:
plot(diff(OutAIS.Data),'.')
Your outliers seem to take a set of quantized values. That might help you replace the values with something more meaningful than a median.

More Answers (1)

Image Analyst
Image Analyst on 17 Mar 2018
Can you attach the data in a .mat file? Also explain how you're getting the red line. For example sometimes you take the tops of the blue spikes and other times, it's in the middle of the spikes. So, why is the red line from 9 - 14 in the 180-182 region, and not in the 4-8 range for y? And from 188-192, why is the red line in the middle and not going along the tops of the blue spikes like in the left hand side of the plot? What rule(s) are you using?
Have you tried boundary()? Or sgolayfilt()?
For the data on the right, have you tried filtering and then tossing out data far away from the filtered result, and then splining the data to fill in missing values? (spline demo attached)
  1 Comment
mike
mike on 19 Mar 2018
Thank you for response, these data are adapted scheme and doesn't follow mathematical equation. the data WAS attached. OutAIS is the noisy data, outGPS is the good data and time

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