Estimation of Space Target Feature Information by Unscented Kalman Filter
In order to strengthen the detection and monitoring of space targets,especially non-cooperative targets,more and more attention has been paid to the characteristics of space targets.The position,velocity,attitude,angular velocity and material complex refractive index of space target were inversely estimated by unscented Kalman filter(UKF).The observation angle,photometric and degree of polarization data were used as the observation values to estimate the state of the target.Based on the position and velocity kinematics model and the attitude and angular velocity dynamic model,the time evolution of the five states was completed,and the joint estimation of the five state parameters was realized.The simulation results show that setting reasonable initial state value,state equation and measurement equation noise,the errors of five state parameters can converge reasonably,and UKF can better predict the five characteristic parameters of space targets.At the same time,it is also verified that the observation angle,luminosity and polarization data can be used to retrieve the five indirect observation characteristic information of space moving targets.
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