This robot executes real-time measuring of the soil-compaction degree while running under its own power on compacted ground for site preparation, roads, dams, etc. The basic conditions for the development of the robot are as follows. o Use shall be possible in a work environment of where bulldozers and other heavy machinery operate. o Running measuring shall be possible with remote control or automatically. o Accurate position detection shall be possible for the robot. o Consecutive, nondestructive, contact-free measuring of the soil-compaction degree shall be possible. o Real-time monitoring of the measuring results and the robot position shall be possible. The development of this robot was executed as a link in the joint research (1985 to 1987) executed mainly by the Public Works Research Institute of the Ministry of Construction for "Development of a high-level construction technology system with use of electronics".