Ground electromagnetic prospecting method based on SPSP (Spread Spectrum) coding technology and detection system thereof

Abstract

The invention discloses a ground electromagnetic prospecting method based on an SPSP (Spread Spectrum) coding technology and a detection system thereof. The ground electromagnetic prospecting method based on the SPSP coding technology comprises the following steps of: supplying a current signal hopping according to a certain coded sequence to underground by a sending electrode, and using the current signal as a manual excitation source; receiving an electromagnetic field response message by a receiver, and meanwhile, synchronously recording the sent current signal and the geoelectrical response message of the position where the receiver is located by the receiver; and obtaining ground system response comprising the geoelectrical resistivity through a correlated identification method, and finally obtaining the distribution characteristics of the geoelectrical resistivity. According to the detection system applying the ground electromagnetic prospecting method disclosed by the invention, a sine-wave or square-wave signal in unipolarity or bipolarity in the whole preset frequency range can be sent by a transmitter, a sending sequence can hop according to a preset frequency pattern, and uncorrelated noise can be removed through a correlated identification detection method.

Description

Technical field [0001] The invention relates to a new method of geophysical prospecting, in particular to a ground electromagnetic prospecting method and detection system using spread spectrum coding technology. Background technique [0002] Frequency domain electromagnetic exploration is an important means of geophysical exploration. The principle of frequency domain electromagnetic method is based on the close relationship between the penetration depth of the electromagnetic signal in the ground, the conductivity of the underground medium and the frequency of the electromagnetic wave used. When the conductivity of the underground medium remains the same, the low-frequency electromagnetic waves penetrate deeper and learn more about the underground, while the high-frequency is the opposite. The frequency domain electrical method is widely used in the exploration of underground metal deposits, geological disaster detection, water resources distribution, coal, oil and gas and othe...

AI Technical Summary

Problems solved by technology

The encoding sequence adopted in the present invention has wide frequency range, rich spectrum information, high frequency spectrum refinement, and uniform main frequency energy distribution, which can overcome the simplification of the transmission sequence and uneven energy distribution, low detection efficiency of a single observation, and low signal-to-noise ratio. The improvement depends on the improvement of system energy and other issues

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