Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2006-11-20
2008-10-21
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357490
Reexamination Certificate
active
07439907
ABSTRACT:
The present invention provides methods and systems that enable a mobile navigation receiver to accurately determine its trajectory with non-current ephemeris in stand-alone mode. In an embodiment, the receiver computes the position for the same location using non-current ephemeris and current ephemeris at different time instances. The receiver then determines a position correction by finding the difference between these two computed positions, and applies this correction to the trajectory generated with non-current ephemeris to obtain a more accurate trajectory. In another embodiment, the receiver computes an initial position of the receiver using non-current ephemeris and finds the difference between the computed initial position and an accurate approximation of the initial position. The receiver then shifts the subsequent receiver trajectory computed using non-current ephemeris by the difference to obtain a more accurate trajectory.
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patent: 2007/0152878 (2007-07-01), Wang et al.
Dong Lei
Mo Jun
Wang Chi-Shin
Wang David
Zhang Wentao
Mull Fred H.
Orrick Herrington & Sutcliffe LLP
SIRF Technology Holdihgs, Inc.
Tarcza Thomas H.
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