Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2008-04-17
2010-06-01
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357490
Reexamination Certificate
active
07728768
ABSTRACT:
A reception environment is determined to be a multipath environment when the difference (positioning altitude difference) between the maximum value (maximum altitude) and the minimum value (minimum altitude) of the altitudes of candidate present positions P of respective satellite sets exceeds a given threshold value (e.g., 200 m), and is determined to be an open-sky environment when the positioning altitude difference is equal to or less than the given threshold value. When the reception environment is the open-sky environment, an evaluation point E of each satellite set is calculated using a known evaluation method based on the number of satellites, a PDOP value, and the like. When the reception environment is the multipath environment, the evaluation point E of each satellite set is calculated in the same manner as in the open-sky environment, and a change amount ΔE corresponding to the difference (altitude difference) between the altitude corresponding to the preceding located position acquired from an altitude table and the altitude of the candidate present position of the target satellite set is subtracted from the evaluation point E.
REFERENCES:
patent: 6535163 (2003-03-01), Sahai et al.
patent: 2005/0261833 (2005-11-01), Brosius et al.
patent: 2006/0227044 (2006-10-01), Terashima et al.
patent: 2006-177783 (2006-07-01), None
Global IP Counselors, LLP
Liu Harry
Seiko Epson Corporation
Tarcza Thomas H
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