MULTIPLE TRANSMISSION UNDERGROUND INVESTIGATION RADAR

PROBLEM TO BE SOLVED: To investigate a buried object over a wide range by disposing a receiving antenna on an antenna case while disposing a pair of transmission antennas in the directions of electric field and magnetic field of a peripheral antenna and distributing the transmission output by means of a distributor. SOLUTION: A receiving antenna 5 is disposed in the center of an antenna case 17 and two transmission antennas 1, 3 and 2, 4 are disposed, respectively, in the directions of electric field and magnetic field of a peripheral antenna. The antennas 1-4 are fed with transmission pulses from a radar display 10 through a distributor 6 and an incorporated amplifier 29. A transmission wave radiated into the ground and reflected on a buried object is received by the antenna 5 and delivered through the radar display 10 and an A/D converter 11 to a personal computer 12 where it is displayed. The case 17 is turned, along with the antennas 1-4, about the fixing base 16 thereof by means of a motor cylinder 7 and the plane of polarization of the antenna can be altered. A truck is scanned in the direction of magnetic field and the case 17 turned by means of the cylinder 7. According to the arrangement, direction of the buried object can be matched with the plane of polarization of the antenna and a highly accurate investigation can be realized.