Among the types of sensors currently used for detecting objects buried underground are the radar types such as microwave pulse sensors, FM-CW and CW sensors as well as magnetic types.
However, since these sensors are housed in caster or tire type frames, vibrations resulting from the ground surface conditions in transporting as well as operating these devices produces a marked effect on their detection characteristics.
For this reason, in investigations performed with the commonly used FM-CW radar, the noise of signals reflected from the ground surface due to vibrations increases and the task of processing images from the signals reflected off of the target object becomes difficult.
In this paper, we propose the use of a housing structure for sensors based on an air-cushion method as one means for overcoming such problems. With this method, the angle between the sensor and ground surface as well as the antenna position can be kept fixed which is an effective way of preventing detection signal weakening due to noise from vibrations.
We also verify the effectiveness of this method with basic experimentation and discuss the results of our study of the characteristics of antenna position stability and vibration in the detection of buried objects.