Bibliography: GPS Signal Filtering

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Bibliography: GPS Signal Filtering

Garmin
Global Locate, Inc.
Sigtec NAvigation Pty Ltd
SiRF Technology Inc. http://www.sirf.com/

There are many useful references at The Institute of Navigation (membership required).

This paper indicates that low elevation salellites contribute a greater degree of error. Since many antennas provide elevation information, it may be possible to recompute while dropping those satellites at a suspect elevation. My suspicion is that this would be equivalent to dropping outliers (by dropping the source of outlier generators).

Lyusin, Sergey V. "The Pulling of Delay Lock Loop under Strong Multipath", Magellan Corp. Moscow Development Center. ION GPS '99, pg 1225.

From the introduction: One of the most important goals [re] GPS/GLONASS receivers is enhancing performance in complicated conditions aggravated by simultaneous harmful factors such as too few visible satellites available, satellites' shading, strong multipath, etc. At the same time, one of the increasingly important requirements for the modern navigational receivers is higher reliability to minimize measurement errors even under the worst reasonable working conditions, i.e., characteristics of the receiver should be secured in as high degree as possible. Reliability of the receiver on whole can be guaranteed only if its functional parts (both hardware and software) have sufficient reliability, this includes signal processing algorithms.

The paper is devoted to analyzing of the pulling processes for the Delay Lock Loop (DLL) in the presence of strong multipath effect. The interest to the problem has emerged when providing some experiments with GPS/GLONASS receiver in urban conditions. Analyzing the results of experiments there was noticed that in some cases the duration of transient process in DLL when locking is growing sufficiently. It's turned out that this is true only for the satellites with rather small elevation angle (less than 20 degrees) and only in the specific azimuth sector which locates in front of a high building's wall about 100 meters from receiver's antenna. It means that the multipath is responsible for delaying of transient process in DLL.