Satellite-based positioning of mobile terminals

Details Satellite-based positioning of mobile terminals Satellite-based positioning of mobile terminals

2005-02-16

2009-12-15

Tarcza, Thomas H (Department: 3662)

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

Directive

Including a satellite

Reexamination Certificate

active

07633436

ABSTRACT:
The invention relates to satellite-based positioning of mobile terminals. Positioning with correction for errors in parameters measured at the mobile terminal is provided. The terminal location is first calculated (S2; S4′) without error correction or with partial error correction. Hereby, a set of nonlinear equations with the UE location and the UE clock bias and possibly the transmission time offset as unknowns are defined, linearized and solved for the mobile terminal location. The quality of the result is determined and compared to a predetermined criterion (S3; S5). If the quality criterion is not fulfilled, the location of the mobile terminal is recalculated with additional error correction (S4, S4′; S6). The proposed method can involve correction for errors in a parameter for time of signal reception, or in a pseudorange parameter, or both. The error correction can be stepwise.

REFERENCES:
patent: 6169957 (2001-01-01), Arethens
patent: 6191729 (2001-02-01), Arethens
patent: 6466164 (2002-10-01), Akopian et al.
patent: 6515618 (2003-02-01), Lupash
patent: 6810324 (2004-10-01), Nadkarni
patent: 2002/0080064 (2002-06-01), Kim
patent: 2004/0189515 (2004-09-01), Vannucci
patent: 2004/0239558 (2004-12-01), Geier et al.
patent: 2008/0036651 (2008-02-01), van Diggelen et al.
International Search Report of PCT/SE2005/000213, mailed Jun. 3, 2005.
Chinese Office Action w/ English translation (10 pages).

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