RADAR is an acronym for Radio Detection And Ranging. It works by sending out electromagnetic energy and recording the reflections. The elapsed time between transmission and reception can be used to calculate the distance to the target. Furthermore, the strength of the reflection can provide insight on certain properties of the target material. This is very useful in pavement analysis in that asphalt layer thickness can be determined and various inferences can be made about each layer

In order to provide the full picture of a road structure, it is essential to complement FWD information with existing asphalt thickness. Asphalt thickness can not be determined by the FWD system alone and is typically obtained by either assuming that either the thickness is constant or by sporadic coring. Assumptions are inaccurate, and not only is coring destructive to the pavement and dangerous because it requires traffic control and personnel, but a coring crew may also cost $2,000 per day.

analysis system yet. GSSI is the world leader in the development and manufacture of Ground Penetrating Radar Systems, systems used to non-destructively explore the subsurface of the ground. Using GSSI's FCC certified RoadscanT GPR System, JILS changed road design for the better forever by integrating the GPR with the JILS truck-mounted FWD.

Data Integration - FWD and pavement thickness data are integrated into a single database using JILS' JTEST Software.

Higher Data Density - Instead of obtaining asphalt thickness via coring once per mile, for example, a DOT can obtain real-time thickness at each of the same 2/10 of a mile testing points where the FWD data is commonly taken.

Data Quality - Pavement thickness at each FWD location provides designers with the data they need to determine accurate design criteria

Flexibility - The FWD vehicle may be used for independent GPR surveys at highway speeds eliminating the need for traffic control.