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A-GPS: Assisted GPS, GNSS, and SBAS


Assisted GPS (A-GPS) allows GPS to work better and faster in any location. This unique book teaches the technical aspects of A-GPS and emphasizes practical implementation. It reviews standard GPS design and will help you understand why GPS requires assist

SKU: 978-1-59693-374 Categories: , , , , Publisher: Artech House Author: Frank Van Diggelen

A-GPS: Assisted GPS, GNSS, and SBAS

Frank Van Diggelen

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 book places emphasis on practical implementation. The book reviews standard GPS design, helping readers understand why GPS requires assistance in the first place. Professionals will 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. This book includes detailed worksheets that show how to compute, analyze, and improve the processing gain from the input signal at the antenna to the signal after the correlators.

This volume also discusses special forms of assistance data, industry standards for  A-GPS, and government mandates for location of mobile phones.

About the Author

Frank van Diggelen is the technical director of GPS systems and the chief navigation officer at Broadcom Corporation. Dr. van Diggelen holds a Ph.D. in electrical engineering from Cambridge University, England.

What Others Have Said

“The rapid penetration of GPS into consumer markets has been sustained in so small measure by developments in Assisted GPS. This timely text provides a comprehensive explanation of this emerging technology. It is a highly readable book, rich in new material such as coarse-time navigation, achievable sensitivity, and initial position from Doppler measurements.”
— Charles R. Trimble, Founder, Trimble Navigation

“The proliferation of Assisted GPS into consumer electronics merited an in-depth explanation of the technology and science behind it. Dr. van Diggelen, an A-GPS authority in the navigation industry, shares his wealth of academic, engineering and field experience with all of us in a truly accessible manner. Warmly recommended to all involved in building location aware products and services.”
— Peter-Frans Pauwels, Co-founder and CTO, TomTom

Assisted GPS is a deep topic, and Frank van Diggelen has skillfully explained everything from the details of coarse-time navigation to the limits of high-sensitivity signal processing. An impressively thorough book that leaves no stone un-turned.
— Steve Wozniak, Fellow, Apple Inc.

Dr. Van Diggelen has a masterpiece on his hands. He covers the topic of Assisted GPS, which will be a critical technology for a good long time. In every paragraph, his love of teaching shines through. He writes with a snap and cadence seldom found in technical writing. He also includes a “book within a book;” some 80 pages or so can be found at the beginning of the book and each chapter. These essays provide overviews to the more analytical material that follows. Enjoy.
— Professor Per Enge, PhD, NAE Stanford University

Publisher: Artech House
Copyright: 2009
Pages: 380
ISBN-10: 1596933747
ISBN-13: 978-1596933743
List Price: $119.00

CHAPTER 1: Introduction
A-GPS Overview. Book Structure. Civilian Signals. Theoretical and Practical Approach. Terminology: A-GPS, A-GNSS. For Whom Is This Book Intended? Whats New?

CHAPTER 2: Standard GPS Review
Overview: How GPS Was Designed to Work. GPS Signal Power. Satellite Orbits. Satellite Clocks. Ephemeris. GPS Signals. Basic GPS Receiver Functions.

CHAPTER 3: Assistance, the A in A-GPS
Acquisition and Assistance Overview. Frequency and Code-Delay Search Space. Frequency/Code-Delay Search with Standard GPS. Tracking, Reacquisition, and Assistance. MS-Assisted and MS-Based GPS. A-GPS Frequency Assistance. A-GPS Time Assistance for Code Delay. Typical Acquisition Scheme, Assisted Cold Start.

CHAPTER 4: Coarse-Time Navigation: Instant GPS
Overview. Navigation, Algebraic Description. Navigation Equations with Coarse Time. Millisecond Integers and Common Bias. Further Navigation Details.

CHAPTER 5: Coarse-Time Dilution of Precision
OverviewHorizontal Dilution of Precision, Accuracy, and 3GPP Standards. Extra-State Theorem. Coarse-Time HDOP Examples.

CHAPTER 6: High Sensitivity: Indoor GPS
Overview. Standard GPS Receiver Architecture. Front-End Analysis. Correlation and Coherent Integration. High-Sensitivity Receiver Architecture. Longer Coherent Integration Times. I,Q Squaring and Noncoherent Integration. High-Sensitivity SNR Worksheet. Other Sensitivity Considerations. High Sensitivity Summary.

CHAPTER 7: Generating Assistance Data
Overview. Reference Stations. Worldwide Reference Network. Initial Position in Assistance Data. Handset-Generated, Peer-to-Peer Assistance.

CHAPTER 8: Ephemeris Extension, Long-Term Orbits
Overview: Assistance When There Is No Assistance. Generating Ephemeris Extensions. Enhanced Autonomous Using Ephemeris Extensions in Place of Full A-GPS Assistance. Integrity MonitoringDealing with Changes in Orbits and Clocks.

CHAPTER 9: Industry Standards and Government Mandates
Overview. 3GPP Location Standards. 3GPP2. OMA-SUPL. Minimum Operational Performance for A-GPS Handsets. Measurement Engine-Position Engine (ME-PE). Government Mandates.

Overview. Serendipity and Intelligent Design in the Original GPS. Future A-GNSS Features for TTFF, Sensitivity, and Accuracy.

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