2011 Volume 6 Issue 4 Pages 503-511
This paper describes the method that measures displacements from the three dimensional coordinate of the radio wave transmitter attached on the slope by the phase differences of received signals that were received by the receivers in the slope surroundings. Concretely, the special low power radio wave emitted by the transmitter on the slope was received by four or more receivers, and then the transmitter coordinates were calculated by an intersection of iso-phase-difference surfaces of each received signal. In the study, we consider the calculation method of the transmitters’ coordinate values and prove by the experiments that we can in real time measure the slope displacement with a high degree of accuracy by using devices with the radio wave of the frequency of 2.4GHz. We show that we can estimate the precision using GDOP that is determined by geometrical arrangement of the transmitters and receivers and verify the applicability of the proposed method in a real slope.
