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# Control filters
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Implement filter plugins for control purposes as https://index.ros.org/r/filters/github-ros-filters/
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Implement filter plugins for control purposes as [ros/filters](https://github.com/ros/filters)
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## Available filters
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This filter implements an algorithm compensating for the gravity forces acting at the center of gravity (CoG) of a known mass, computed at a `sensor_frame` and applied to a `data_in` wrench.
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The filter relies on tf2, and might fail if transforms are missing.
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The filter relies on tf2, and might fail if transforms are missing.
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Note that, for convenience, the filter can perform additional frame changes if data_out frame id is given.
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Note that, for convenience, the filter can perform additional frame changes if data_out frame id is given.
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### Required parameters
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### GC: Required parameters
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*`world_frame` (ℛ<sub>w</sub>): frame in which the `CoG.force` is represented.
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*`sensor_frame` (ℛ<sub>s</sub>): frame in which the `CoG.pos` is defined
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*`CoG.pos` (p<sub>s</sub>): position of the CoG of the mass the filter should compensate for
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*`CoG.force` (g<sub>w</sub>): constant (but updatable) force of gravity at the Cog (typically m.G), defined along axes of the `world_frame`
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### Algorithm
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### GC: Algorithm
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Given
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This filter implements a low-pass filter in the form of an [IIR filter](https://en.wikipedia.org/wiki/Infinite_impulse_response), applied to a `data_in` (double or wrench).
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The feedforward and feedback coefficients of the IIR filter are computed from the low-pass filter parameters.
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