Appeal No. 1997-1215
Application No. 08/092,684
This is a decision on appeal under 35 U.S.C. § 134
from the rejection of claims 1 and 4, the claims having been
twice rejected. Claim 3 has been canceled and claims 2 and 5
have been indicated as being allowable by the Examiner.
The invention relates to the field of navigation
systems which use a constellation of Earth-orbiting satellites
to determine the position of a receiver at or near the Earth’s
surface. More specifically, the invention relates to a method
and apparatus for detecting and quickly compensating for large
cycle slips to improve the accuracy of position estimates. A
cycle slip occurs when a receiver loses track of the phase of
a carrier wave, for example, due to shading of the receiver
from direct line-of-sight reception from the satellite or from
noise. Using accumulated delta range (ADR) techniques, a
cycle slip will introduce error into the position
computations. The conventional navigation system, i.e., the
2
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