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

Step Frequency Ground Penetrating Radar Characterization and Federal Evaluation Tests

Introduction

Potential interference testing of an FHWA/USDOT SF GPR system was conducted by FAA staff at the FAA Technical Center in New Jersey during the week of March 9, 2009. The testing was designed to evaluate whether SF GPR can be operated safely in a proposed configuration that may include frequency notching in specific frequency bands. Testing was conducted with all notches turned on and then with all notches turned off to allow for both scenarios to be evaluated. Testing focused on emissions characterization measurements suitable for computer analysis of potential interference with relevant systems.

Data from SF GPR emissions testing described and summarized in this report are expected to be used to determine whether FHWA/USDOT SF GPR meets NTIA criteria. An initial data analysis is provided in this report. Electronic test data are also provided with this report to the NTIA Spectrum Planning Subcommittee (SPS) for further analysis by individual Federal agencies as needed.

In addition, follow-up SF GPR emissions test data were collected in September 2009 at an FCC-certified laboratory after the SF GPR was fine-tuned to reduce emissions at specific frequencies (based on results from the initial March 2009 emissions tests). Data from this follow-up testing are presented in appendix C, and a test report produced by the certified test laboratory is presented in appendix E.

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