Abstract:

In the hybrid-source magnetotelluric detection, in order to make up the natural field whose frequency and power are lower, achieve the reception of the effective signal, a synchronous data acquisition approach based on GPS(Global Position System) was put forward by analyzing the operating principle of the transmitter and the receiver. The transmitter sends high-frequency electromagnetic waves as the manual source. With the orientation and timing of GPS, time calibration of the transmitter and the receiver was achieved. And the discrepancy of the two system clock was under 1 s to ensure the synchronous transmission of the signal. The experiment proved that the signal frequency range of the hybrid-source magnetotelluric detection expanded from 0.1 Hz~1 kHz to 0.1 Hz~50 kHz because of the complementation of the manual signal and the natural signal, and the detection depth of the instrument was deeper.

Key words: hybrid-source magnetotelluric, data acquisition, global position system(GPS), synchronous