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

Step Frequency Ground Penetrating Radar Characterization and Federal Evaluation Tests

Objective

Initially, SF GPR emission characterization measurements were conducted to achieve the following primary objectives:

  • Evaluate SF GPR capabilities to meet SPS requirements for operation under NTIA rules for out-of-band operations.

  • Measure emissions from a proposed SF GPR configuration with the frequency spectrum notching off and analyze data to evaluate potential interference issues relative to critical Federal systems.

  • Measure emissions from a proposed SF GPR configuration with the frequency spectrum notching on and analyze data to evaluate potential interference issues relative to critical Federal systems.

  • Measure emissions relative to individual notches anticipated to be implemented based on proximity to relevant facilities.

Data collected at the FAA Technical Center in March 2009 indicated that follow-up measurements were needed to achieve the objectives listed above (with minor revisions) and to evaluate the SF GPR in greater detail at low frequencies.

The revised objectives for the follow-up measurements were as follows:

  • Evaluate SF GPR capabilities to meet SPS requirements for operation under NTIA rules for out-of-band operations.

  • Measure emissions from a proposed SF GPR configuration with the frequency spectrum notching off and analyze data to evaluate potential interference issues relative to critical Federal systems.

  • Measure emissions from a proposed SF GPR configuration with the frequency spectrum notching on and analyze data to evaluate potential interference issues relative to critical Federal systems. Three options for frequency spectrum notching configurations were defined and tested, A1, A2, and A3, and are presented in the background section.

  • Collect detailed emissions data at frequencies from 50 to 200 MHz to evaluate system performance in this low frequency range.

In addition, a coordination procedure was proposed to provide a framework for system users to operate SF GPR responsibly under NTIA rules. The proposed coordination procedure is described in detail in appendix A.

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