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Article: GPS + modernized GPS + Galileo: signal timing biases.(global positioning system)(Column)
- Article from:
- GPS World
- Article date:
- March 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 Questex Media Group, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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GPS TIMING AND NAVIGATION USER SOLUTIONS ARE BASED ON PSEUDORANGE MEASUREMENTS MADE by correlating user-receiver-generated replica signals with the signals broadcast by the GPS satellites. Any bias resulting from this correlation process within a user receiver tends to be common across all receiver channels when the signal characteristics--code type, modulation type, and bandwidth--are identical. Such common biases will cancel out in the user navigation solution and appear as a fixed bias for timing solutions and some atmospheric signal analyses. New GPS signals and the future Galileo signals are somewhat different than the legacy signals broadcast by GPS satellites today, ...
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