Geophysical Survey Systems, Inc. (GSSI)


GSSI is the world's leading manufacturer of Ground Penetrating Radar (GPR) Systems. We are based in Nashua, NH and employ about 90 people. We make commercial products, not military products but do sell to a number of military customers. Our products are used in a variety of applications including construction, utility locating, geophysical/environmental, transportation and archeology.


StructureScan Mini XT

The StructureScan Mini XT is GSSI’s newest generation of our very popular all-in-one ground penetrating radar systems. The StructureScan Mini XT offers a 2.7 GHz antenna for superior target resolution and can reach depths up to 60 cm (24 in). This system is designed with the option for users to add accessories and tailor the unit to specific applications. With multiple modes of operation, the StructureScan Mini XT is ideal for locating rebar, conduits, post-tension cables, voids and real-time determination of concrete slab thickness.

SIR 4000

The SIR® 4000 is GSSI’s first high-performance GPR data acquisition system designed to operate with analog and digital antennas. This evolutionary step allows for true versatility and flexibility by supporting a wide range of users across numerous applications.


The UtilityScan features a wireless and lightweight configuration, our patented HyperStacking technology for unparalleled data quality, and integrated LineTrac system. This state-of-the-art system sets the new standard in performance and price

PaveScan RDM

The PaveScan RDM is ideal for uncovering inconsistencies that occur during the paving process, including poor uniformity and significant variations in density. By detecting these problems, PaveScan RDM helps to avoid premature failures such as road raveling, cracking and deterioration along joints.