Appeal No. 96-4122
Application 08/077,419
independent of any other separate inertial reference system.
According to the claimed invention, the road surface-fixed
reference system must be “dependent” on corrected first
signals which first signals represent movements of the vehicle
relative to an inertial reference system. The examiner cites
Chan as teaching the conversion from an inertial vehicle
reference system to a road surface-fixed reference system.
However, the objective of Chan is entirely different. As is
stated in Chan’s column 17, lines 27-38:
Sensor data therefore includes the effects of any
aircraft motion. To reduce the system false alarm
rate to an acceptable level, potential threats must
be tracked in an inertial coordinate system.
Effects of aircraft motion must therefore be
eliminated from the raw sensor data before tracking
can be done. Three rate-integrating gyros located
at the sensor and strapped down to the aircraft hull
will be able to measure motion caused by aircraft
maneuvers as well as motion caused by aircraft
vibrations, flexure and turbulence.
Chan’s teaching concerns aircrafts in flight, not wheeled
vehicles which travel by frictional contact between wheels and
the road surface. Road surface-fixed reference, in the
context of the appellants’ specification, has no meaningful
significance in Chan. Chan also seeks to eliminate all
effects of vehicle motion, not just those caused by changes in
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