A spacecraft attitude kinematics model, attitude measurement model, and filter algorithm are three important parts in spacecraft attitude determination, and a high-precision filtering algorithm is the key to attitude determination. The classical sigma-point Kalman filter (SPKF) is widely used in a spacecraft state estimation area with the Gaussian white noise hypothesis.
Click here for original story, A centered error entropy-based sigma-point Kalman filter for spacecraft state estimation with non-Gaussian noise
Source: Phys.org