8 Way Radar Modules

The core of our GPR hardware is a 3 transmitter, 8 receiver module

Communication is achieved using a gigabit ethernet interface, with extra TTL input/outputs available via the mil-spec power connector.

A number of these modules can be combined using an Ethernet switch and are designed to be daisy chained together to produce larger arrays.

Alternatively arrays can be created using switches within the antenna system however this is only possible with the low peak power signals used in our technology. It is not possible to switch impulse GPR technology due to the high peak voltages involved. This enables the creation of large antenna arrays, even with just one radar module (there is however a compromise with the speed of collection).

External antennas can be switched either using the 4 level controllable DC voltage available on each of the receiver and transmitter output, or the spare TTL output on the mill-spec output connector. These voltages can also power the front end amplifiers for both the transmitters and receivers.

8 Way Radar Modules

General specification

  • Number of transmitters: 3
  • Number of independent receivers: 8
  • Number of 3.3V TTL inputs/outputs: 5 (via 10 pin milspec connector)
  • Power Consumption: 24W (via 10 pin milspec connector)
  • Input voltage: 24V
  • Physical Dimensions: approx. 300mm x 200mm x 40mm
  • Weight: approx. 1.5kg.
  • Signal Dynamic Range: 95 dB for separation of earlier and deeper targets (separated by greater then 150mm), 55dB for closely spaced targets (separated by less than 150mm). Signal level is relative to the strongest returned echo.
  • Signal repeat rate (after stacking 32k times): 500 profiles/s for each receiver.
  • Typical penetration depth: 0.5 - 2 meters, for current antennas and typical road pavement materials.
  • Special Features: Inbuilt transmitter and receiver calibration for both signal amplitude and the signals frequency spectrum. Multi baseline CMP dielectric calibration with ground coupled antennas.
  • -3 dB Frequency Spectrum: 100MHz to 4000MHz (further limited by choice of antennas)
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