Method of acquiring satellite data

Details Method of acquiring satellite data Method of acquiring satellite data

2004-11-22

2009-08-11

Tarcza, Thomas H (Department: 3662)

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

Directive

Including a satellite

C342S357490, C342S357490

Reexamination Certificate

active

07573423

ABSTRACT:
The present invention provides a method of acquisition of satellite data by a mobile device including a radio navigation satellite system (RNSS) receiver. The method includes: the receiver receiving a signal transmitted by a plurality of satellites and corresponding to a sum of signals each transmitted by a satellite and each modulated by a spread spectrum signal characteristic of said satellite; the receiver generating a plurality of local duplicates each of which is the duplicate of a spread spectrum signal characteristic of a satellite; correcting the frequency of each of the local duplicates by compensating the Doppler effect of each of the satellites; summing the plurality of corrected duplicates; and determining the correlation function as a function of time between the sum of the plurality of corrected duplicates and the satellite data signal.

REFERENCES:
patent: 4949268 (1990-08-01), Nishikawa
patent: 4998111 (1991-03-01), Ma
patent: 5663734 (1997-09-01), Krasner
patent: 5874914 (1999-02-01), Krasner
patent: 6185427 (2001-02-01), Krasner et al.
patent: 6313787 (2001-11-01), King et al.
patent: 1 146 349 (2001-10-01), None

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