When dealing with tracking problems of nonlinear maneuvering target

the conventional nonlinear filtering methods have larger tracking error and are easy to cause filters divergence.To solve both problems

an interacting multiple model square-root cubature Kalman filter based on Strong tracking filter (IMM-SCKF-STF) is proposed by introducing SCKF-STF into IMM algorithm.In the novel tracking algorithm

it introduces a strong tracking fading factor into SCKF

and makes it possess of not only strong tracking ability to abrupt change of state of maneuver target but also outstanding tracking ability to maneuver target had by IMM method.Accordingly

it has better nonlinear filtering estimate accuracy and algorithm stability for this proposed tracking algorithm

especially the tracking robust performance to deal with abrupt change of state of maneuver target should be improved clearly.Finally

two simulation examples are presented to compare the novel algorithm with the current IMM-UKF on tracking performance and the results show that the novel one is better than IMM-UKF algorithm on estimate accuracy and tracking performance.