MALÅ 30-channel 3D multi-antenna GPR
New for 2026. A 30-channel array acquires dozens of closely spaced parallel profiles in a single pass: instead of isolated profiles to interpolate, we obtain a continuous 3D volume of the shallow subsurface.
How GPR works
Ground-penetrating radar (GPR) transmits short, high-frequency electromagnetic pulses into the ground and records waves reflected by discontinuities: changes in material, moisture, metallic and non-metallic objects, and voids. The return time, together with the propagation velocity in the medium, indicates the depth of the reflector.
Why multi-antenna and 3D?
In 2026, our owned equipment was expanded to include a 30-channel MALÅ multi-antenna GPR system. The antenna array acquires dozens of closely spaced parallel profiles in a single pass; combined with GNSS positioning, or a total station indoors, this produces a continuous 3D volume of the shallow subsurface rather than isolated profiles that need to be interpolated.
From the volume, we produce maps at constant depth (depth slices) and sections in any direction: pipes and cables that change direction, tanks and basins, cavities and subsidence appear as continuous features, not scattered points along widely spaced profiles.
Applications
- Buried utilities and networks
- Tanks and basins at remediation sites
- Cavities, voids and subsidence
- Preventive archaeological surveys
- Pavements, slabs and sub-bases
- Support for planning excavations and drilling
Deliverables
The typical investigation range is 0–5 m, depending on ground conditions. We provide depth slices, sections and interpreted plans in CAD and GIS formats, ready for design teams, contractors and remediation work. Where required, GPR data are integrated with electrical, seismic and electromagnetic surveys to build an overall interpretation of the site.
From a single-pass survey to a 3D volume
The diagram shows the principle of a multi-antenna survey: the array traverses the area in adjacent strips, the 3D volume is assembled, and sections and constant-depth maps are extracted from it, where pipes, cavities and buried structures appear as continuous features.
- GPR reflections and hyperbolas
- Pipes and utilities
- Multichannel array and depth slice
Images and results
Frequently asked questions
What is the difference between multi-antenna and traditional GPR?
Traditional GPR acquires one profile at a time, and the map is produced by interpolating profiles spaced apart. The 30-channel MALÅ array records dozens of closely spaced parallel profiles in a single pass: the result is a continuous 3D volume from which sections and maps at any depth can be extracted.
How deep can GPR reach?
The typical investigation range is 0–5 m. The effective depth depends on the ground: in dry, resistive materials the signal penetrates further; in clays and water-saturated soils containing conductive water, it attenuates sooner. We assess this on a case-by-case basis before the survey.
How are the data georeferenced?
Outdoors, we use GNSS positioning; indoors or where satellite signals are unavailable, we use a total station. Results are delivered in CAD and GIS formats, ready to overlay on plans and maps.
Does GPR replace trial pits?
No. It substantially reduces the number and extent of trial pits, indicating where to dig and what to expect; anomalies should always be confirmed on site when the stakes warrant it.
What information is needed for a quotation?
The location and area to be surveyed, the surface type (asphalt, soil, paving), the objective—utilities, tanks, cavities, archaeology—and any available plans.
Often combined with this survey
Planning a project?
Send us the location and objective of the survey: we will recommend a suitable combination of methods and provide a detailed quotation.