Ranging signal structure with hidden acquisition code

Details Ranging signal structure with hidden acquisition code Ranging signal structure with hidden acquisition code

2011-04-26

2011-04-26

Gregory, Bernarr E (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Radar ew

Ecm

C342S013000, C342S016000, C342S175000, C342S195000, C380S255000, C380S287000, C380S059000

Reexamination Certificate

active

07932851

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 blocks0through i, where i is an integer, are formed from random sequences of components A0to Ai, each of the components being N bits, and each block including A0through Ai components. A plurality of random sequences of components B0through Bi, where i is an integer, of 2N bits is also formed. The components A0through Ai in blocks0to i are formed into a matrix and the polarities of the components A0through Ai are made to correspond to the polarities of a Hadamard matrix. The components A0through Ai of each block are randomly permuted with components B0through 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.

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patent: WO 02/13436 (2002-02-01), None

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