The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 2006
Filed:
Dec. 15, 1989
William Clay Choate, Dallas, TX (US);
Charles Emil Frey, Colony, TX (US);
James Anthony Jungmann, San Antonio, TX (US);
William Clay Choate, Dallas, TX (US);
Charles Emil Frey, Colony, TX (US);
James Anthony Jungmann, San Antonio, TX (US);
Raytheon Company, Waltham, MA (US);
Abstract
A method and apparatus is disclosed for determining the range between two planes, ownship () and target (). Model data () estimating the velocity and position of target () is compared to actual flight path data of the target () passively received by ownship (). The model data () and actual data is compared, and an error measurement is calculated. The model data is also subject to position and velocity constraints (and) which penalize unrealistic estimates. The error measurement and penalties are used to create a perturbation model () which is added to the model data to generate new model data. When the model data () conforms closely to the actual data, a range is computed from the model data ().