DISTRIBUTED SURVEY SYSTEM FOR OBTAINING UNDERGROUND ELECTRICAL CHARACTERISTICS AND DISTRIBUTED SURVEY METHOD USING SAME

There are provided a distributed survey system for obtaining underground electrical characteristics and a distributed survey method using the same which can be flexibly compatible with the survey purposes, the geographical conditions of the survey region, etc. and which can obtain the underground electrical characteristics more efficiently in a shorter time. In the invention, survey units (1, 2, 3, . . . (N−1), N) are distributed across a region in which underground electrical characteristics are to be obtained. Each survey unit includes at least one current supply point TX and a current supply device for supplying a current underground from the relevant current supply point TX; and/or at least one measurement point RX and measurement device for measuring a response signal in response to the current supply from each measurement point RX, and synchronization control device which is disposed in each of the survey units for exerting control to supply currents with waveforms encoded so as to yield covariances of zero from the current supply points, and controlling the measurement device to measure the response signals in response to the relevant current supply, while synchronizing operation of the current supply means with operation of the measurement device.