GNSS Test Tool

The GNSS Test Tool is a powerful application designed to automate the analysis of GNSS test results. It supports both static and dynamic test modes, utilizing either live data collection or pre-recorded log files. The tool provides advanced features like NMEA parsing, Circular Error Probable (CEP) calculation, and data visualization, making it an essential resource for GNSS testing and analysis.

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Key Features

1. Static and Dynamic Test Analysis:
   • Supports live and log-based tests for both static and dynamic modes.
2. NMEA Data Parsing:
   • Parses standard and proprietary NMEA 0183 messages, such as GGA, GSV, and more.
3. NMEA Extractor Tool:
   • Quickly extracts specific message types (e.g., GGA, GSV) to reduce runtime.
4. CEP Calculation:
   • Computes CEP50, CEP68, CEP90, CEP95, and CEP99 values using reference points or the mean of collected data.
5. Excel Export:
   • Outputs parsed data, summary statistics, and satellite information for further analysis.
6. Error Handling:
   • Provides clear error messages and handles exceptions gracefully.
7. Logging:
   • Logs all events and errors for troubleshooting.
8. Data Visualization:
   • Displays logs, plots, and summaries in an intuitive interface.

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Installation

1. Install Python 3.x on your system.
2. Navigate to the /dist folder in the application directory.
3. Choose the appropriate application based on your operating system:
   • Windows: Run the .exe file.
   • MacOS: Run the .app file.
4. For advanced use, open the Extractor program to optimize log files.

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Usage

1. Static Test Analysis

• Live Static: Analyze real-time data from devices connected via serial ports.
• Static Log: Analyze pre-recorded log files for post-test evaluation.

2. Dynamic Test Analysis

• Live Dynamic: Compare real-time data from test devices to a reference device on a per-second basis.
• Dynamic Log: Perform analysis using pre-recorded log files for both the reference and test devices.

3. NMEA Extractor Tool

• Extract specific NMEA message types (e.g., GGA, GSV) to reduce runtime and focus on relevant data.

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Known Limitations

1. Concurrent Analysis: Supports up to 10 devices or log files simultaneously.
2. Serial Settings: Devices must be configured to 8-N-1 serial communication.
3. Dynamic Test Reference: Selecting the "Reference Device" clears previously set configurations—ensure this is selected first.
4. Excel Logging Limit: Maximum of 1,048,576 rows; logging stops once the limit is reached.
5. Logfile Formatting: Ensure no empty lines in pre-recorded log files to avoid termination errors.
6. Runtime Optimization: For large datasets, use the NMEA Extractor Tool to streamline analysis.

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Logs and Output

Logs and results are saved in the /dist/logs folder, with the naming convention:
<NMEA_YYYYMMDD_HHMMSSssssss>.

Each test log contains:

• Console Log: Important messages and errors.
• Raw Log File: Unprocessed NMEA messages.
• Excel File: Parsed data and summary for custom analysis.

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Improvements and Future Roadmap

• Expand analysis to include additional metrics like speed, heading, and altitude.
• Add support for two-antenna heading analysis and other advanced GNSS features.

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For further details, refer to the attached protocol document or contact the development team. Enjoy using the GNSS Test Tool for your GNSS testing needs!