Hello community
As you may know, the IMU (inertial magnetic unit) based motion capture (wearable motion capture system) is a recently developed system to track human motion and its application is evolving.
I am trying to understand the possibility of their application in a skating and skiing sports as well as its limitations.
However, I am still confusing why these motion capture systems need additional GPS or DGPS or LPS (local positioning sensor) when capturing skiing, skating, and skateboarding as sliding motions.
there are many papers explains the theories, though I need to understand the fundamental concept as simply as possible.
Please share your knowledge experience. Any information can be helpful for me.
Best: Purevsuren
If an external positioning system like GPS/DGPS/LPS is hindering your purpose of use, you could try something like Opal from APDM (link provided). This is a system of wearable inertial sensors that would directly give synchronized readings to a local computer. The product specification claims to store 30 days of kinematic data on each sensor by itself and states that its use can be pervasive too.
Thank you very much, Patrick A Costigan, for your effort and your detailed information. this is really what I want to understand. by the way, can i ask the sensor name which you mentioned above (the good one you currently working on).
Patrick's answer pretty much sums things up. You could implement what he has detailed with the Opal system (as mentioned by Ebenezer) or try building your own! Sparkfun have all the inertial sensor components you would need. There are lots of tutorials on YouTube also.
For any theory reference, the book by Titterton and Weston: "Strapdown Inertial Navigation Technology", is a good go to guide. But be warned its very mathematical.
The system called XSense is very expensive, you can look at CAPTIV MOTION at http://teaergo.com/site/index.php
Very flexible and powerful system for motion capture and analysis.
I'm working for over 5 years on inertial sensors and skiing (nordic, alpine and mountaineering). We are using the sensors provided by GaitUp (gaitup.com). They are releasing soon a new version and they have IMUs + GNSS in the same sensor.
However, be aware that using standard GNSS (even with Kalman fusion) will not give you the precision you need for alpine ski racing. There, you should invest in a differential GNSS solution. For references please check the the papers by Matthias Gilgien.
Obtaining a drift free orientation with IMUs is not so easy but can be done. However, I'm not convinced that Kalman filters are a good solution.
There is also the ICSS 2016 congress in Austria this December where most skiing researchers will be present. For researchers interested in wearable technologies, I am preparing an unofficial applied session on using IMUs for ski research.
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