Appeal 2006-2252
Application 10/397,012
on one or more GPS satellites. The Kalman filter calculates the ephemeris
data and clock error data (Specification p. 7).
Brodie discloses an apparatus for continuously monitoring a plurality
of satellites from space (col. 1, ll. 11 to 16). The apparatus includes a
plurality of GPS receivers on the plurality of GPS satellites (col. 4, ll. 30 to
46). A broadcast period is defined and each satellite broadcasts during the
assigned portion of that period. The GPS receivers continuously monitor
and receive navigation signals from the plurality of GPS satellites and
identifiy the broadcasting satellite by noting the time of broadcast (col. 4, ll.
40 to 42). The system also includes a Kalman filter on each GPS satellite.
The Kalman filter calculates the ephemeris data and clock error data (col 4,
ll. 22 to 29). Brodie does not disclose that the GPS receivers receive their
own navigation signals such that the navigation signal can be cancelled by
using the GPS receiver’s signal processor.
The GPS satellites disclosed in Brodie are a new generation of GPS
satellites referred to as GPS block IIR satellites which employ a special
transponder unit which is designed to transmit ultra-high frequency (UHF)
signals between GPS satellites (col. 2, l. 62 to col. 3, l. 5). While the GPS
satellites in Brodie transmit and receive UHF signals the satellites are
nonetheless GPS satellites.
5
Page: Previous 1 2 3 4 5 6 7 8 Next
Last modified: September 9, 2013