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

By Frank van Diggelen

ISBN-10: 1596933747

ISBN-13: 9781596933743

ISBN-10: 1596933755

ISBN-13: 9781596933750

Assisted GPS (A-GPS) has been built to supply tremendously stronger features, assisting GPS paintings larger and speedier in nearly any situation. supplying an in depth examine the entire technical facets and underpinnings of A-GPS, this specified booklet areas emphasis on functional implementation. The e-book experiences normal GPS layout, assisting why GPS calls for counsel within the first position. you find how A-GPS permits the computing of a place from navigation satellites within the absence of particular time an issue no longer coated in the other booklet. furthermore, you how you can layout and learn a excessive sensitivity GPS receiver and ensure the achieveable sensitivity. The booklet presents special worksheets that exhibit the best 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 plausible sensitivity is derived and defined within the e-book. This state-of-the-art quantity discusses specified varieties of tips information, criteria for A-GPS, and govt mandates for situation of cellphones. you furthermore mght locate insurance of destiny international navigation satellite tv for pc structures and the way they are often designed particularly for instant-fixes and excessive sensitivity. The publication beneficial properties a number of 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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Extra resources for A-GPS: Assisted GPS, GNSS, and SBAS

Sample text

All values of frequency are in kHz to clearly show the relative importance of each factor. The code-delay search space is limited to 1,023 chips (1 C/A code epoch). It can be reduced if precise time assistance is available and initial position is reasonably well known. 7. 3 Cold, Warm, and Hot Starts The GPS receiver without any a priori knowledge is performing a cold start and has to search a two-dimensional space (of frequency bins and code-delay chips) of about 20 ´ 1,023 up to 50 ´ 1,023. This search requires at least 20s (slightly more than 1s to search all 1,023 possible code delays in each frequency bin).

GPS week 0 began at midnight (UTC) the beginning of January 6, 1980. The first week number rollover occurred on August 21, 1999, coincidentally just a few months before the other great rollover happening, Y2K. This meant that the GPS week rollover received quite a lot of media attention at the time. Most GPS receivers had little or no trouble with the week number rollover. The next such rollover will be a few leap seconds before midnight UTC at the end of April 6, 2019. The overall quality of the broadcast ephemeris has improved since GPS began in 1980.

Then the broadcast time of week and ephemeris must still be decoded. ­For a hot start, the almanac or ephemeris can be used along with a priori position, time, and frequency, to reduce the search space. If time is known well enough (from an accurate real-time clock), then broadcast time of week and ephemeris need not be decoded. Clearly, if the ephemeris data were available through some means other than the expected one, time to fix would be reduced by at least 30s in both cold and warm starts.

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


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