User's Manual
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7.8 Specifications
• 500 MHz bi-static radar antenna
• Designed to be used with the Microsoft Surface Pro 4 tablet (or Panasonic Tough Pad).
• Dimensions: 30.5 x 11 x 49.5 inches (77.5 x 27.9 x 125.7 cm).
• Weight: 26.6 lbs. (12.1 kg).
• Shipping container dimensions: 33.4 x 22.0 x 12.9 inches (84.8 x 55.9 x 32.8 cm).
• Shipping weight: 69 lbs (31.3 kg).
• WiFi connection between sensor and tablet.
• Durable construction with IP65 ingress protection.
• Positioning systems includes odometer, GPS, and optional inertial measurements.
• Generate reports of ballast condition.
• Rechargeable LiFePO4 battery provides 5-6 hours of use. Includes second battery for all day
use.
7.9 Data File Format
Data recorded by the GPR system are stored using the HDF5 file format. HDF5 allows
storage of large datasets in complex data structures. In addition to the data stored in an HDF5
file, the files provide all of the data type and format information needed for reading the data. A
helpful utility for quickly browsing HDF5 file is the HDFView utility which is freely available from
the HDF5 Group (https://www.hdfgroup.org/downloads/index.html
). The HDF5 Group provides
free software interfaces for HDF5 in most popular computer languages including Fortran, C,
Java, Python, and Matlab. Figure 5 is a screenshot from HDFView showing the contents of an
H5 file recorded by the sonic logging system. On the left is a tree structure that lists the
datasets in the file. The JobInformation dataset contains information about the jobsite. There is
a folder for each data server (e.g., gpr4, odometer, irTemperature, pavementDensity, etc.) on
each node (e.g., the logger or the probe), and each folder contains configuration information
and data. As shown below, the detailed format of each dataset is included in the file. This self-
describing feature of HDF5 files along with the open software interfaces allows the data to be
easily read by user-developed software.