SIP data acquisition and processing method without synchronizing current acquisition transmission and frequency domain measurement
A technology of data collection and frequency domain measurement, applied in radio wave measurement systems, measurement devices, geophysical measurements, etc., can solve problems such as increased observation costs, unfavorable field work, and weak electromagnetic signals, so as to reduce observation costs and get rid of dependence The effect of sex and algorithm simplicity
Active Publication Date: 2020-01-10
ZHONGBEI UNIV
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Problems solved by technology
However, the electromagnetic signals observed in the field are generally weak, and the accuracy of phase measurement is difficult to guarantee
In addition, although the amplitude measurement is easier than the phase measurement, when the ambient noise is large, to complete the high-precision amplitude measurement, the power supply current needs to be increased to improve the signal-to-noise ratio
In general, the frequency domain data acquisition method requires the observation system to have a relatively high accuracy and stability, which will increase the observation cost and is not conducive to field work
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[0059] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings
[0060] Firstly, the present invention proves that "real part and imaginary part" and "amplitude and phase" of complex resistivity are equivalent through existing theoretical analysis, and the two can be transformed into each other. Accordingly, the complex resistivity at a certain frequency point can be obtained by using the voltage amplitude and phase of the frequency, and the amplitude and phase of the current signal synchronized with the voltage data of this segment. In addition, the amplitude and phase of the voltage signal can be obtained directly by performing time-frequency transformation on the original sampling data. But because of the lack of synchronous current data, the spectral information of the current signal cannot be calculated in this way.
[0061] In this case, the present invention uses an absolute phase calculation method ...
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The invention relates to an SIP data acquisition and processing method without synchronizing current acquisition transmission and frequency domain measurement. The SIP data acquisition and processingmethod is characterized by comprising the steps of calculating initial phases and amplitude normalization coefficients of all frequency currents which can be emitted from an emitter in advance by a phase calculation method, and generating an initial phase table file, namely generating an emission frequency table and an initial phase table, on the basis of the initial phase and the amplitude normalization coefficient; acquiring a phase value of an excitation current of a certain frequency at an arbitrary moment by a relative phase calculation method according to initial emission time and acquisition time of the frequency voltage data; and automatically constraining voltage amplitude and phase which are obtained by full-phase spectral analysis according to length, thereby obtaining compelx resistivity of a frequency point. By the SIP data acquisition and processing method, the dependence of a system on high-performance equipment capable of synchronizing current acquisition and real-timetransmission or high-accuracy frequency domain observation device is cased off, the flexibility of the SIP method is improved, and the observation of the SIP method is smoothly developed under a complicated environment such as a weak GPS signal.
Description
technical field [0001] The invention belongs to the field of geophysical electromagnetic detection, and in particular relates to a data acquisition and processing method of a frequency-domain induced polarization method (SIP method) without synchronous current acquisition and transmission and frequency-domain measurement. Background technique [0002] The frequency-domain induced polarization method (SIP method) is an important branch of the induced polarization method, and the observation target is the complex resistivity of the survey area. This method can provide a more detailed description of the electrical structure of the underground medium in the survey area, and is an important means of detailed investigation. The SIP method can achieve high-density observations in both the time domain and the frequency domain. Compared with other geophysical exploration methods, the SIP method has the advantages of multi-parameter measurement and comprehensive information output. ...
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IPC IPC(8): G01V3/38G01V3/02
CPCG01V3/02G01V3/38
Inventor 葛双超曲畅
Owner ZHONGBEI UNIV