A-GPS: Assisted GPS, GNSS, and SBASToday, increasing demands and expectations are being placed on GPS systems. Assisted GPS (A-GPS) has been developed to provide greatly improved capabilities, helping GPS work better and faster in almost any location. Offering a detailed look at all the technical aspects and underpinnings of A-GPS, this unique book places emphasis on practical implementation. The book reviews standard GPS design, helping you understand why GPS requires assistance in the first place. You discover how A-GPS enables the computing of a position from navigation satellites in the absence of precise time - a topic not covered in any other book. Moreover, you learn how to design and analyze a high sensitivity GPS receiver and determine the achievable sensitivity of a GPS receiver. The book provides detailed worksheets that show how to compute, analyze, and improve the processing gain from the signal strength at the antenna to the carrier-to-noise ratio (C/N0) at the front end, to the signal-to-noise ratio (SNR) after the correlators. This cutting-edge volume discusses special forms of assistance data, industry standards for A-GPS, and government mandates for location of mobile phones. You also find coverage of future global navigation satellite systems and how they can be designed specifically for instant-fixes and high sensitivity. The book features numerous tables, worksheets, and graphs that illustrate key topics and provide the equivalent of a technical handbook for engineers who design or use A-GPS. |
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Часто встречающиеся слова и выражения
3GPP A-GNSS A-GPS receiver accuracy acquisition almanac altitude antenna approximately assistance data Assisted GPS bandlimited baseband broadcast ephemeris CDMA Chapter chip coarse-time code delay code-delay search coherent integration coherent SNR common bias complex correlators constellation correlation peak correlation response data bit decoded DOPs E-OTD effect ephemeris extensions example expected filter fine-time assistance frequency bins frequency error front end full pseudoranges Galileo GDOP Global Positioning System GLONASS GNSS GPS receiver GPS satellites HDOP ideal coherent gain implementation losses initial position interface interval leap seconds matrix mobile phones MS-assisted MS-based multipath navigation equations noise figure noncoherent integration orbits and clocks priori position PRN code pseudorange QZSS reference frequency reference stations sample rate samples/chip satellite clock satellites in view search space Section server shows signal strength SNR worksheet Specification squaring loss standard GPS Table Teff tests tion TTFF vector