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author | Lorenz Meier <lm@inf.ethz.ch> | 2013-08-28 08:14:13 +0200 |
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committer | Lorenz Meier <lm@inf.ethz.ch> | 2013-08-28 08:14:13 +0200 |
commit | 5fe3c49ba0e7e3f64f5b6c9b64ced675c01b14fe (patch) | |
tree | 5f024477d370d92edacead7412f60f6757cbf082 /src/modules/position_estimator_inav/inertial_filter.c | |
parent | e44d134c6c64535f67e26f9633206aba50a10613 (diff) | |
parent | 66c61fbe96e11ee7099431a8370d84f862543810 (diff) | |
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Merged multirotor branch
Diffstat (limited to 'src/modules/position_estimator_inav/inertial_filter.c')
-rw-r--r-- | src/modules/position_estimator_inav/inertial_filter.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/modules/position_estimator_inav/inertial_filter.c b/src/modules/position_estimator_inav/inertial_filter.c new file mode 100644 index 000000000..13328edb4 --- /dev/null +++ b/src/modules/position_estimator_inav/inertial_filter.c @@ -0,0 +1,31 @@ +/* + * inertial_filter.c + * + * Copyright (C) 2013 Anton Babushkin. All rights reserved. + * Author: Anton Babushkin <rk3dov@gmail.com> + */ + +#include "inertial_filter.h" + +void inertial_filter_predict(float dt, float x[3]) +{ + x[0] += x[1] * dt + x[2] * dt * dt / 2.0f; + x[1] += x[2] * dt; +} + +void inertial_filter_correct(float e, float dt, float x[3], int i, float w) +{ + float ewdt = w * dt; + if (ewdt > 1.0f) + ewdt = 1.0f; // prevent over-correcting + ewdt *= e; + x[i] += ewdt; + + if (i == 0) { + x[1] += w * ewdt; + x[2] += w * w * ewdt / 3.0; + + } else if (i == 1) { + x[2] += w * ewdt; + } +} |