Patent ID: 8421622

Claim:
A monitoring system for a moving object, comprising: a leaking transmission device having a first and second leaking transmission paths extending substantially in parallel to each other; first equipment for transmitting a first transmission signal from one end side of both the ends of the leaking transmission device as a transmission medium to the other end side; second equipment for transmitting a second transmission signal from the other end side of both the ends of the leaking transmission device as the transmission medium to the one end side; and a detector for detecting a two-dimensional movement of a moving object as a monitoring target on the basis of a difference between variation of a first reception signal and variation of a second reception signal, wherein the first transmission signal is radiated as a first electric wave from one of the first and second leaking transmission paths, the first electric wave is reflected from the moving object as the monitoring target to obtain a first reflection electric wave, and the first reflection electric wave is received through the leaking transmission device, thereby obtaining the first reception signal while the second transmission signal is radiated as a second electric wave from one of the first and second leaking transmission paths, the second electric wave is reflected from the moving object as the monitoring target to obtain a second reflection electric wave, and the second reflection electric wave is received through the leaking transmission device, thereby obtaining the second reception signal.