The GSSI SIR-20 is a powerful, multi-channel GPR data acquisition unit coupled with a rugged laptop for ease of use and portability. This machine has revolutionized the GPR industry by combining a robust data collection unit and Panasonic ToughBook PC with GSSI’s leading RADAN GPR software. Collecting 3D images is made simple with this Windows-based system.

SIR-20 provides reliable GPR data and can be used in flexible situations. Whether mounted in a vehicle, on a cart system or utilized directly on a job site, the highest quality data results will be obtained. SIR-20 can be utilized with all GSSI antennas and in a variety of applications.

Typical Uses of the SIR-20 include:

  • Road structure assessment
  • Concrete inspection
  • Geological investigation
  • Archaeology
  • Rail bed inspection
  • Mining
  • Bridge deck inspection
  • And many other custom applications
  • Dual channel system – allows data collection using any two GSSI antennas
  • Operates on either 120 Volts AC or 12 Volts DC
  • Rugged Panasonic ToughBook computer provides familiar Windows environment
  • Integrates with GPS
  • Large data storage capacity
  • Perfect solution for vehicle mounted applications
  • 2-year warranty
  • FCC compliant for US customers
Antennas Records data from 1 or 2 hardware channels simultaneously; 1 to 4 data channels, selectable
Display Modes Linescan and O-scope.
In linescan display, 256 color bins are used to represent the amplitude and polarity of the signal.
Automatic System Setups Storage of an unlimited number of system setup files for different survey conditions and/or antenna deployment configurations.
Operating Modes Free run, survey wheel, point mode
Range Gain Manual adjustment from -20 to +100 dB. Number of segments in gain curve is user-selectable from 1 to 8.
Vertical Filters Individually filter the scans in the same domain. Low and High Pass, Infinite Impulse Response (IIR), Finite Impulse Response (FIR), Boxcar and Triangular filter types are available.
Radar Connectors
  (2) antenna inputs
(1) 12 VDC input power
(1) survey wheel or DMI input
(1) marker input
Size 466 x 395 x 174 mm (18.4 x 15.5 x 6 in)
Weight 10 kg (22 lbs)
Antennas Operates with any GSSI model antenna and can handle up to 2 antenna inputs simultaneously
Resolution 5 picoseconds
Range 2-8,000 nanoseconds full scale, selectable
Output Data Format

8- or 16-bit, selectable

Rates @ 100 KHz PRF
Max Rate (scans/Sec)
Samples 1 channel 2 channels
128 450 255
256 265 135
512 153 78
1025 78 39
2049 39 19

Rates @ 500 KHz PRF - International Systems only
Max Rate (scans/Sec)
Samples 1 channel 2 channels
128 980 700
256 725 475
512 570 290
1025 340 190
2049 190 105
Input Power 12 volts, DC nominal with operating range of 11-15 volts, 60 watts
Operating Temperature -10°C to 40°C external
Relative Humidity <95% non-condensing
Storage Temperature -40°C to 60°C
Data Storage
Standard (Internal) 80 GB
Optional (External) Any standard PC peripheral using the PC parallel port, USB port or PCMCIA port
Radar System Parameters
  Signal to noise ratio: > 110 dB
Dynamic range: > 110 dB
Time base accuracy: 0.02%