Inside GNSS Media & Research

MAR-APR 2018

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48 Inside GNSS M A R C H / A P R I L 2 0 1 8 www.insidegnss.com I n Android Release N ("Nougat"), Google introduced APIs giv ing access to GNSS raw measurements from your phone. Now Google has pub- licly released Analysis Tools to process and analyze these measurements. Android now powers more than two billion devices, and Android phones are made by many different manufacturers. e analysis tools enable manufacturers to see details of how the GNSS receiv- ers are performing in different phone designs. Also, with the tools publicly available app developers, researchers, and educators can use them to develop, build and teach. is article shows what these tools do, a nd how t hey revea l deta i ls of receiver and signal behavior that are not possible to obser ve without raw measurements. We begin w it h t he basic opera- tion of the tools, then describe the raw measurements, derived data, interac- tive controls, and custom parameters. Additionally, we'll work through three examples, showing how you can use the tools for easy, but fairly sophisticated, analysis. Next, we'll cover report gen- eration, and on-phone analysis. en we'll describe some specifics of dual- frequency analysis, including the mis- sion planner. Finally, we' ll describe where to download the tools, open- source code on Git hub, f requent ly asked questions and how to provide feedback. Basic Operation e basic operation of the tools is: users log raw GNSS Measurements with their phones, and analyze on their desktops. ANALYSIS TOOLS GNSS Analysis Tools from Google Google has publicly released GNSS Analysis Tools to process and analyze GNSS raw measurements from your phone. These tools enable manufacturers to see in detail how well the GNSS receivers are working in each particular phone design and thus improve the GNSS design and performance in their phones. Also, with the tools publicly available there is significant value for app-developers, researchers and educators. Here, the authors show what these tools do, and how they reveal details of receiver and signal behavior that are not possible to observe without raw measurements. FRANK VAN DIGGELEN GOOGLE INC. MOHAMMED KHIDER GOOGLE INC

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