3d-Radar Geoscope Mk4 User Manual page 8

TM
GeoScope User's Manual
TX Radiation pattern RX Radiation pattern
Common footprint
Figure 3 - Ultra-wideband bow-tie antenna pair (cross section).
As opposed to traditional octave-band GPR antennas, the ultra-wideband
bow-tie monopoles have continuous frequency coverage from the 200 MHz
range up to 3 GHz as illustrated in Figure 4. In practice this allows the user to
collect data from 140 MHz to 3 GHz without changing antennas. By
comparison, a similar survey using impulse GPR would require use of
200MHz, 400 MHz, 800 MHz and 1600 MHz antennas.
100MHz
200MHz
400MHz
800MHz
1200MHz
Figure 4 - Wideband coverage of the 3d-Radar antenna array.
The antenna elements are arranged in a linear array as shown in Figure 5
where the transmitting and receiving antennas are displaced to each other.
During the survey, the radar combines the transmit/receive antennas
sequentially to obtain a number of profiles (or channels) as shown in Figure
5.
© 2013 3d-Radar AS Page 4 Revision 2.0 Date: 02/07/2013