By Frank van Diggelen
Assisted GPS (A-GPS) has been constructed to supply enormously superior services, assisting GPS paintings higher and speedier in virtually any situation. delivering a close examine the entire technical elements and underpinnings of A-GPS, this special ebook locations emphasis on sensible implementation. The publication experiences general GPS layout, assisting why GPS calls for information within the first position. you find how A-GPS permits the computing of a place from navigation satellites within the absence of specified time an issue now not coated in the other booklet. additionally, you easy methods to layout and learn a excessive sensitivity GPS receiver and be sure the possible sensitivity. The booklet presents distinct worksheets that exhibit the right way to compute, study, and increase the processing achieve from the enter sign on the antenna to the sign after the correlators. those worksheets are utilized in the e-book to generate households of curves that perfectly signify receiver sensitivity, parameterized when it comes to entrance finish noise determine, coherent and noncoherent integration instances. From this paintings a legislations of a possibility sensitivity is derived and defined within the e-book. This state of the art quantity discusses certain types of advice information, criteria for A-GPS, and executive mandates for situation of cellphones. you furthermore may locate assurance of destiny international navigation satellite tv for pc platforms and the way they are often designed in particular for instant-fixes and excessive sensitivity. The e-book positive factors various tables, worksheets, and graphs that illustrate key themes and supply the similar of a technical guide for engineers who layout or use A-GPS.
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Additional resources for A-GPS: Assisted GPS, GNSS, and SBAS
Once it has acquired the signals, a conventional GPS receiver must decode the broadcast time of week, and the ephemeris data containing the satellite orbit and clock models. Only then can the receiver compute position. 1 Introduction to Frequency/Code-Delay Search Space In this section, we give an overview of the problems of acquisition, introducing the frequency/code-delay search that the receiver must perform. We then give a quantitative overview to show why a conventional receiver takes about a minute or more to get a first fix.
But, since the Earth itself is rotating beneath the satellites, when you observe the satellite orbits from the Earth, they do not appear like simple circles. After one complete orbit (about 12h) each satellite will be back where it started in the orbital plane, but it will be on the other side of the Earth, because the Earth has spun halfway around. 4. Other MEO satellite navigation systems have found other orbit altitudes that give repeatable behavior, but only GPS orbits repeat the same apparent path every day.
The search range is indicated by the white rectangular boxes, and the desired satellite signal is found in the intersection of the two boxes. The more precise the assistance data, the narrower the search range can be. Assistance always provides some reduction in the frequency search, but there is a reduction in the code-delay search only if fine-time assistance is available. oscillator offset, and a small contribution from receiver velocity. 4 kHz of unknown frequencies caused by the Doppler effect of satellite motion.