Patent Document ID: 10109060
Application ID: 15152696
Patent Flag: 1

Claim One:
1. A method for target motion analysis for a system providing strongly observable state components and weakly observable state components related to an observer and a target comprising the steps of: initializing strongly observable state components into strong state vectors; utilizing weakly observable state components to form a weak state analysis grid having a plurality of nodes; calculating initial weak state probability density functions from the strong state vectors, weak state analysis grid, and weakly observable state components; calculating strong state gradients associated with the strong state vectors for each node of the weak state analysis grid; calculating direction of a target track of the strong state vectors from the calculated strong state gradients utilizing the vectorized Householder transformation and back-substitution for nodes of the weak state analysis grid; updating the strong state vectors utilizing the updates obtained from the vectorized Householder transformation and back-substitution calculation directly for nodes of the weak state analysis grid; updating the weak state probability density functions from the updated strong state vectors, weak state analysis grid, and weakly observable state components; establishing an information threshold based on change in information related to the updated weak state probability density functions and the previous weak state probability density functions; determining if the updated weak state probability density functions when compared with the previous weak state probability density functions exceed the information threshold; recalculating the steps of calculating strong state gradients, calculating direction, updating the strong state vectors for nodes of the weak state analysis grid, and updating the weak state probability density functions if the information threshold is exceeded; and providing the strong state vectors and weak state probability density functions as output if the information threshold is not exceeded.