Article,
A Novel GPS Cross Correlation Mitigation Technique
Proc. of the 18th ION GNSS Conf., (2005)
Abstract
Cross correlations caused by the limited dynamic range of the GPS
Gold codes represent a significant problem in the observation of
weak GPS signals. This is of particular concern in applications such
as assisted GPS for E911 and in the use of GPS for remote sensing
where the presence of a single strong GPS signal can make observation
of other weaker signals difficult. A number of different techniques
have been developed to deal with the 'near-far' problem ranging from
cancellation (subtraction) methods through to subspace-projection
techniques. This paper provides a brief review of the cross correlation
problem followed by a description of a new a sub-optimal approach
to dealing with the 'near-far' problem. The new technique is similar
in approach to the subspace projection techniques already described
in the literature, but is realizable in hardware or software, thereby
making the method applicable for real receivers. Simulations showing
the performance of the method under various scenarios are given and
the advantages and limitations of the technique are discussed.
