Appeal 2007-0277
Application 10/270,236
• “This [local interference] can reduce the accuracy of the coordinates
derived by the GPS receiver by several hundred meters.” P. 1, l. 31 – p. 2, l.
1.
• “… the range of error represents how far a later-derived GPS
coordinate can be from the initial position without generating a warning.” P.
4, ll. 30-31.
• “GPS receiver 102 selects the best combination of available GPS
signals from the satellite network and derives/calculates the resulting GPS
coordinates of interference detector 100.” P. 5, ll. 5-7.
6. The “expected GPS parameter” is one which “can be entered manually or
computed automatically from known or calibrated information and stored in
appropriate memory in either or both of the interference detector 100 or the
monitoring unit 200.” Specification, p. 6, ll. 26-28.
Obviousness
7. The Examiner found that:
[C]olumn 5, lines 3-11 and column 6, lines 32-37 of the Huston et al
reference teach a method for detecting errors in GPS accuracy comprising
the steps of receiving GPS-related data at a marker (see the GPS receiver),
calculating at least one derived GPS parameter (see apparent range of GPS
receiver position) and comparing the at least one derived GPS parameter
with the expected parameter (see the estimated range) to determine the error
in GPS accuracy. Further the derived GPS parameter and the expected GPS
parameter used in the comparing step in Huston et al is a satellite
pseudorange (see col. 6, lines 33-34) and as such meets the “at least one of”
limitation as required in claim 13.
Answer 4.
8. Column 5, lines 3-11 of Huston read as follows:
[The method of calibrating a GPS satellite range signal for errors,
8
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