UNDERGROUND RADAR

PURPOSE:To easily and clearly visually recognize a strong reflector by detecting the reflector under the ground as volume data, and displaying it as a gray level image observed from arbitrary viewpoint. CONSTITUTION:When a sensor radiates a search beam, its radiating direction is scanned, and hence obtained echo becomes volume data having three- dimensional spread, and stored in a memory 2. When a strong reflector exists in an area to which the beam is transmitted, the intensity of the stored echo becomes stronger at the site where the reflector exists, and hence the intensity of the echo is detected at the strongly reflecting surface of the degree regarded as being the presence of the reflector, thereby detecting the reflector under the ground. After the reflector is detected, an image forming unit 3 image- processes the volume data indicating the reflector of the stored echo data, and a gray level image obtained from the arbitrary viewpoint at the reflector is displayed on a display unit 4.