Table 2 Performance index for the matricial global (\(\gamma\)C) and local (\(\gamma\)UC) filters, with \(\gamma\) varying between 1 and 4 reliable accelerometers, in which, each of the criteria [\(\Psi\) in (15)–(18), and \(\Upsilon\) in (26)–(28)] are applied in the matricial filters algorithms
From: Global Kalman filter approaches to estimate absolute angles of lower limb segments
Segments | Filters criteria | |||||||
|---|---|---|---|---|---|---|---|---|
4C | 4UC | 3C | 3UC | 2C | 2UC | 1C | 1UC | |
Body | 1.649 | 1.684 | 1.980 | 2.063 | 1.964 | 1.923 | 2.191 | 2.335 |
Thigh | 0.926 | 0.937 | 0.652 | 0.702 | 0.664 | 0.772 | 0.815 | 0.810 |
Shank | 0.783 | 0.818 | 0.858 | 0.956 | 0.568 | 0.660 | 0.606 | 1.656 |
Foot | 1.456 | 1.439 | 1.618 | 1.586 | 1.470 | 1.453 | 1.359 | 1.316 |
Average | 1.204 | 1.220 | 1.277 | 1.327 | 1.167 | 1.202 | 1.243 | 1.529 |
AR (%) | 2.4 | 2.4 | 11.3 | 14.3 | 22.2 | 36.1 | 29.2 | 64 |
AGR (%) | 2.4 | – | 9.4 | – | 15 | – | 15 | – |