Method and apparatus in positioning without broadcast ephemeris

Details Method and apparatus in positioning without broadcast ephemeris Method and apparatus in positioning without broadcast ephemeris

2011-01-11

2011-01-11

Beaulieu, Yonel (Department: 3661)

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

C342S357490

Reexamination Certificate

active

07869948

ABSTRACT:
Provided herein are methods and system for enabling a navigation receiver to generate receiver specific satellite orbital models based on relatively small sets of parameters obtained from a server. In an embodiment, a set of parameters for a satellite includes a force parameter (e.g., solar radiation pressure), initial condition parameters (e.g., satellite position and velocity at a time instance) and time correction coefficients, which the receiver uses in a numerical integration to predict the position of the satellite. The set of parameters needed for the integration is small compared to current methods which require transmission of a complete set of ephemeris and other parameters for each satellite. Since the set of parameters is relatively small, it requires less communication resources to transmit compared to current methods. Further, the integration based on the small set of parameters enables the receiver to predict satellite orbits with low computational load.

REFERENCES:
patent: 5963167 (1999-10-01), Lichten et al.
patent: 6157621 (2000-12-01), Brown et al.
patent: 2007/0024496 (2007-02-01), Wright et al.
patent: WO 00/13971 (2000-03-01), None
PCT Search Report, Jul. 11, 2008, SiRF Technology.

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