Abstract:

The kinematical characteristics of active decoy trajectories used for midcourse penetration are analyzed. It is indicated that the kinematical difference between decoys and physical targets is nonsignificant and this nonsignificant difference can be reflected by the estimated residuals of initial parameters. For physical targets, the normalized estimated residual is Gaussian; while for decoys, the residual is nonGaussian, this can be served as a basis for discrimination. Then, the maximum likelihood (ML) estimate problem of the initial parameter is presented and a Levenberg-Marquardt (L-M) iterative algorithm is employed to obtain the parameter. The discrimination algorithm is designed based on the normalized residual. The advantage of the method is that it can not only discriminate the decoys but also determinate the orbit of true targets precisely. Finally, the simulation verifies the validity of the algorithm.