SIP data acquisition and processing method without synchronous current acquisition and transmission and frequency domain measurement
A data acquisition and frequency domain measurement technology, applied in radio wave measurement systems, measurement devices, geophysical measurements, etc., can solve problems such as increasing observation costs, unfavorable field work, weak electromagnetic signals, etc., to reduce observation costs and get rid of dependence. The effect of sex, algorithm simplicity
Inactive Publication Date: 2019-04-05
ZHONGBEI UNIV
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Problems solved by technology
However, the electromagnetic signals observed in the field are generally weak, and it is difficult to guarantee the phase measurement accuracy.
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] First of all, 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 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 the absolute phase calculation method ...
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The invention relates to a SIP data acquisition and processing method without synchronous current acquisition and transmission and frequency domain measurement. The SIP data acquisition and processingmethod without synchronous current acquisition and transmission and frequency domain measurement has the characteristics that initial phases and amplitude normalization coefficients of all frequencycurrents transmitted by a transmitter is calculated in advance by using an absolute phase calculation method, and an initial phase table file is generated on the basis of the initial phases and the amplitude normalization coefficients; that is, a transmission frequency table and a initial phase table are generated; a phase value of the excitation current of a certain frequency at any time is obtained according to a relative phase calculation method by using initial emission time of the excitation current and acquisition time of frequency voltage data; and complex resistance at a frequency point can be obtained by automatically restricting the voltage amplitude and phase obtained by the full phase spectrum analysis according to the length. According to the SIP data acquisition and processing method without the synchronous current acquisition and transmission and the frequency domain measurement, the dependence of a system on high performance synchronous current acquisition and real-timetransmission equipment or high precision frequency domain observation device is cast off, the flexibility of the SIP method is improved, and the smooth development of SIP method observation in complex environment such as weak GPS signal in realized.
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 realize high-density observation 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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Login to View More IPC IPC(8): G01V3/38G01V3/02
CPCG01V3/02G01V3/38
Inventor 曲畅其他发明人请求不公开姓名
Owner ZHONGBEI UNIV