Portable Wireless High Power Air-coupled GPR System for Highway Inspection

摘要

A FCC compliant 1 GHz portable wireless high power air-coupled ground penetrating radar (GPR) system has been successfully designed and implemented with the sponsorship of Texas Department of Transportation, United State. The differential transmitting pulses have Ins pulse width and ±30V amplitude. The GPR receiver uses differential sequential sampling architecture and has 60dB dynamic range. With its high transmitting power and low-noise system design, the detecting depth of this air-coupled GPR can reach 2 meters in asphalt. The GPR data acquisition and processing software is developed. Lab tests and pavement tests were made to verify the performance. A high way survey was executed on HW69 at in Paris District northeast of Dallas, TX. The first layer dielectric constant and thickness, and other layer feature were measured. Accuracy of the GPR measurement is within -3% to +4%, comparing with the sample cores measurement.