Signal structure for global positioning systems

Details Signal structure for global positioning systems Signal structure for global positioning systems

1997-11-20

2000-03-28

Olms, Douglas W.

Multiplex communications

Communication over free space

Repeater

370342, 370441, 370479, 342357, 342463, H04J 1300

Patent

active

060440716

ABSTRACT:
A system for providing a signal structure for code-division multiplexed radio positioning comprises a coherent signal source from which carrier frequency and all lower frequencies used in code definition are derived through frequency synthesis. A radio frequency (RF) carrier approximately centered in the available band is provided. Binary phase shift modulation of the RF carrier by a composite signal made up of: (a) a first coded signal whose code is publicly known having a short repeat interval, whose spectral content lies within the center portion of the avaILABLE BAND AND (b) a second coded signal having a much longer repeat-interval composed of repetitions of a multibit symbol repeated in direct or inverted form according to the values of a second coded signal, not publicly released whose repeat interval is much longer than that of the first coded signal, wherein the multi-bit symbol has an odd number of bits (chips) with equal numbers of binary 0 and 1 bit values and is chosen from among all such multi-bit signals for its having low autocorrelation values with shifted versions of itself including, as part of its composite modulation signal, one or more additional coded signals used for radio positioning.

REFERENCES:
patent: 5101416 (1992-03-01), Fenton et al.
patent: 5541606 (1996-07-01), Lennen
patent: 5724046 (1998-03-01), Martin et al.

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