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Publication Number: FHWA-HRT-10-037
Date: October 2010

Step Frequency Ground Penetrating Radar Characterization and Federal Evaluation Tests


The analysis procedure for the SF GPR emissions characterization data followed equations defined in NTIA Annex K.(3) The analysis steps are as follows:

  1. Determine the orientation of maximum emissions for each measurement and use this measurement data for subsequent analysis.

  2. Calculate EIRP values at each frequency using the following equations. Equation 1 defines field strength as a function of field strength plus adjustments. Equation 2 further refines the definition of field strength as a function of field strength adjusted by the antenna factor and cable loss in terms of a unit length. Equation 3 converts from units in terms of unit length back to units in terms of decibels relative to 1 mW.

    Field Strength (dBµV) = Field Strength (dBm) + 107 (1)

    Field Strength (dBµV/m) = Field Strength (dBµV) + Antenna Factor + Cable Loss (2)

    EIRP in dBm = Field Strength (dBµV/m) – 95.2 (3)

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