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:
Apr. 26, 2011
Filed:
Oct. 15, 2002
James M. Clark, Verona, NJ (US);
James M. Clark, Verona, NJ (US);
ITT Manufacturing Enterprises, Inc., Wilmington, DE (US);
Abstract
A method and apparatus for generating a data structure to be embedded in a ranging signal or in a synchronization preamble of a digital signal are disclosed. In a preferred embodiment, a plurality of blocksthrough i, where i is an integer, are formed from random sequences of components Ato Ai, each of the components being N bits, and each block including Athrough Ai components. A plurality of random sequences of components Bthrough Bi, where i is an integer, of 2N bits is also formed. The components Athrough Ai in blocksto i are formed into a matrix and the polarities of the components Athrough Ai are made to correspond to the polarities of a Hadamard matrix. The components Athrough Ai of each block are randomly permuted with components Bthrough Bi. When the permuted components of the blocks are embedded in a ranging signal or in a synchronization preamble of a signal, the blocks will appear to an unauthorized user of the signal as being unrelated.