Frank van Diggelen's A-GPS: Assisted GPS, GNSS, and SBAS PDF

By Frank van Diggelen

ISBN-10: 1596933747

ISBN-13: 9781596933743

ISBN-10: 1596933755

ISBN-13: 9781596933750

Assisted GPS (A-GPS) has been constructed to supply vastly greater functions, supporting GPS paintings greater and quicker in virtually any situation. delivering a close examine the entire technical features and underpinnings of A-GPS, this targeted publication locations emphasis on useful implementation. The e-book experiences common GPS layout, aiding you know 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 detailed time an issue no longer coated in the other publication. furthermore, you how you can layout and study a excessive sensitivity GPS receiver and ensure the feasible sensitivity. The booklet offers special worksheets that express tips on how to compute, learn, and enhance 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 possible sensitivity is derived and defined within the ebook. This state-of-the-art quantity discusses specific sorts of counsel facts, criteria for A-GPS, and executive mandates for situation of cell phones. you furthermore may locate insurance of destiny worldwide navigation satellite tv for pc structures and the way they are often designed particularly for instant-fixes and excessive sensitivity. The booklet beneficial properties various tables, worksheets, and graphs that illustrate key subject matters and supply the an identical of a technical instruction manual for engineers who layout or use A-GPS.

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These approaches are also discussed in Chapter 9. 6, we derive the sensitivity of frequency assistance to errors in the assistance data, including time, speed, position, almanac, and ephemeris. 7, we do the same thing for code-delay assistance. 8 with coarse-time assistance and with fine-time assistance. 5 min, while for an A-GPS receiver, it can be 1s or less. 2 kHz. This is to point out explicitly where the search range covers negative and positive values (such as in the case of unknown frequency) and to contrast this with searches that cover only positive values (such as the entire code-delay space of 0–1023 chips).

The next component of the receiver is the correlator; it multiplies the noisy signal by a replica of the PRN code. As we discussed before, if the locally generated code is exactly aligned with the received signal, then the +1 code terms will all be aligned with +1 terms, and the –1 code terms will all be aligned with –1 terms, producing a positive value for each multiplication. The multiplied values are then summed (or integrated). 12 Basic GPS receiver architecture. This figure shows the basic functional blocks that are common to all GPS receivers.

The transmit gain is higher at the edges of the cone so that the received power on the surface of the Earth is roughly constant. 2. shows the variation in guaranteed minimum received power over satellite elevation for all elevations from 5°–90°. The nominal outdoor signal strength is often quoted as –130 dBm. This number comes from the minimum guaranteed signal strength published in the (old) GPS ICD Rev C [4]. 5 dBm [5], however the –130-dBm value is still widely used as the nominal outdoor signal strength.

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A-GPS: Assisted GPS, GNSS, and SBAS by Frank van Diggelen

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