The GPS modernization program is now in full swing. The benefits of the program have already been seen with the launch of six Block IIR-M satellites transmitting the L2C signal and there is more to come. The next milestone will be the launch of Block IIR-M (20), also known as SVN49, which will carry with it a demonstration payload of the highly anticipated L5 signal. This addition to the GPS constellation will have a significant impact on the number of linear combinations which can be formed from carrier phase observations. (more…)
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