Chapter 4 covers the details of how A-GPS allows almost instant time to fistfix, with a technique known as coarse-time navigation.Chapter 5 explains the effect of coarse-time navigation on position accuracy, byexamining the dilution of precision (DOP).Chapter 6 is a large chapter that shows in detail how A-GPS and receiver design produces high sensitivity, so that receiver can work in many more places, even indoors.Chapter 7 describes how assistance data is generated.Chapter 8 looks at special forms of assistance data, known as ephemeris extensions,or long-term orbits, which provide accurate satellite orbits for days into the future.Chapter 9 covers industry standards for A-GPS and government mandates forlocation of mobile phones.In Chapter 10, we look at future A-GNSS. We review the features of GPS thathave been useful for A-GPS, and we use the lessons learned from A-GPS design todescribe possible features of future global navigation satellite systems that will improve time to first, sensitivity, and accuracy.
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