Google used millions of Android phones to map the worst enemy of GPS
In a paper published this week in Nature, Google researchers demonstrated they were able to use GPS signal measurements ...
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Millions of phones create most complete map ever of the ionosphere
Researchers mapped Earth’s ionosphere, part of the upper atmosphere, using signal data from 40 million phones – a method that ...
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Chapter 3: GPS Signal Structure and Theoretical Performance
This chapter discusses the details of the Global Positioning System (GPS) signal structure, its specifications, and general properties. The chapter begins with a review of the general performance ...
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Chapter 4: GPS Satellite Signal Characteristics
In this chapter, we examine the properties of the GPS satellite signals, including frequency assignment, modulation format, navigation data, and the generation of PRN codes. This discussion is ...