Mitsui Engineering and Shipbuilding Company Limited

Chihiro Jyomuta

Noriaki Kimura

Fujio Oka

Kanji Murasawa

Masuo Konishi

Hidetoshi Nishikawa

Kunihiro Mitsuhashi

Subsurface target identification radar includes an antenna array, a rotary encoder, a radar controller, a polarization switching circuit, and transmitter and receiver circuits. The antenna array is constituted by dipole antennas having plane triangle elements. The antennas are disposed at angular intervals of 120.degree. with respect to a rotated symmetric point of the array. The rotary encoder generates a distance pulse every time the radar travels a presetted distance. The radar controller sequentially generates three switching pulses within one period on the basis of the distance pulse from the rotary encoder. The polarization switching circuit selects an arbitrary dipole antenna as a transmitting antenna from the antenna array, selects an arbitrary dipole antenna, other than the selected antenna, as a receiving antenna, and changes a combination of selected antennas every time the switching pulse is generated by the radar controller. The transmitter and receiver circuits transmit/receive electromagnetic waves through the selected antennas.

Subsurface target identification radar

Method and apparatus for impact-type inspection of structures

Growing community of inventors

Tamano, Japan

Chihiro Jyomuta