Glossary of Aviation Terminology |

**Jerk:** Rate of change of acceleration, either scalar or vector, often with subscripts such as ENU or XYZ to denote the coordinate frame; time derivative of acceleration; Symbols: j,J; Typical Units: ft/s-cubed; Dimensions: Length / Time-cubed;

**Kalman filter: **A filter for combining multiple data sources, usually of different types, to produce an estimate better than any single source; Compare: averaging filter, complementary filter;

**KALTINT: **Altitude integral gain

**KINT: **Path integral gain

**KLA:** Reference acceleration gain

**KTAE: **Track angle error gain

**KVSF:** Velocity error scale factor

**KXTKD:** Crosstrack deviation gain

**KXTKR:** Crosstrack deviation rate gain

**KZSF:** Altitude error scale factor