Inside GNSS Media & Research

MAR-APR 2018

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56 Inside GNSS M A R C H / A P R I L 2 0 1 8 of receivers. Click "Make Report" to automatically create the test report. e report evaluates the API implementa- tion, Received Signal, Clock behavior, and Measurement accuracy. In each case it will report PASS or FAIL based on the performance against known good benchmarks. is test report ( Figure 9 ) is primarily meant for the phone manufac- turers to use as they iterate on the design and implementation of a new phone. Compare Log Files You can load multiple files and do side- by-side comparison of C/N 0 . e "Com- pare" tab lets you load several different log files to compare against each other. The [Plot C/N 0 ] button then pro- duces side-by-side plots of the strongest satellites from each log file ( Figure 10 ). To Download the Tools and Open-Sourced Code The compiled tools run on Windows, Mac and Linux. They have been pub- licly released by Google, and are avail- able free for download at: GNSSTools Open-sourced Java code is avail- able for t he GnssL og ger app, a nd open-sourced Matlab code is available for the GPS-only part of the desktop analysis. e point of this open-source code is to help developers create their own apps, and also to provide a tem- plate for how certain values are com- puted (such as pseudoranges, discussed above). We will evolve the analysis tools in response to user requests, but we do not intend to open source all the code for the desktop tools beyond what is already available. Manufacturers In Example 3, the green dots showing the truth reference are obtained from a NovAtel SPAN system from NovAtel Inc., Calgary, Alberta, Canada. e dual frequency measurements are obtained from the BCM47755 chip from Broad- FIGURE 9 Extract from test report showing PASS/FAIL on API implementation, Received Signal strength, Clock behavior, and Measurement accuracy. ANALYSIS TOOLS

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