Multipath and tracking error reduction method for...

Details Multipath and tracking error reduction method for... Multipath and tracking error reduction method for...

2005-03-15

2005-03-15

Fan, Chieh M. (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S149000, C375S137000, C375S150000, C370S335000

Reexamination Certificate

active

06868110

ABSTRACT:
A multipath mitigation method consists of locating a multipath-invariant (MPI) point of an ideal autocorrelation function and measuring the distance between the MPI point and DLL. The same MPI point is located in a received correlation function, and the distance between the point and the DLL, now affected by multipath, is measured. The difference between the ideal distance and the actual distance is the code tracking error resulting from multipath. The error is subtracted from the computed pseudorange or used to control the DLL. The method can be used to reduce the effects of all types of tracking error sources, such as signal transmission failure or code noise.

REFERENCES:
patent: 6236673 (2001-05-01), Julg
patent: 6243409 (2001-06-01), Fenton et al.
patent: 6252863 (2001-06-01), Raby et al.
patent: 6493378 (2002-12-01), Zhodzishsky et al.
Bryan Townsend and Patrick Fenton,“A Practical Approach to the Rduction of Pseudorange Multipath Errors in a L1 GPS Receiver”,Proceedings of ION GPS-94, 7thInternational Meeting, Salt Lake City, Sep. 20-20, 1994 pp143-148.*
P.G. Mattos, “Multipath Elimination for the Low-Cost Consumer GPS,”Proceedings of the 9th International Technical Meeting of the Satellite Division of the Institute of Navigation, vol. 1, pp. 665-671, 1996.

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