Spread Spectrum Signal Induced Polarization Parameter Acquisition
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Solution Overview
Problem
Conventional induced polarization methods suffer from low frequency domain resolution, weak anti-interference capability, and significant coupling influence, leading to distorted measurements of induced polarization parameters in geophysical exploration.
Innovation Solution
A method and apparatus using a spread spectrum signal to acquire induced polarization parameters by processing time sequence data into frequency spectrum values, normalized complex values, and combined frequencies, calculating apparent resistivity, percent frequency effect, and comparative phase to enhance measurement accuracy and interference resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional frequency-domain induced polarization methods use square wave signals or multi-frequency wave signals with limited frequency points, then the measurement process is simple, but the frequency domain resolution is low and it is impossible to accurately describe the variation law of induced polarization parameters
Solution Approach 1:
The patent changes the signal type from conventional square wave or multi-frequency wave to spread spectrum signal, and changes the frequency distribution from discrete limited points to continuous spectrum. This parameter change enables high frequency domain resolution while maintaining measurement capability through correlation processing between transmitted and received signals.
Solution Approach 2:
The patent transitions from measuring at discrete frequency points to analyzing the entire frequency spectrum continuously. By using spread spectrum signals that occupy a broad frequency band and applying spectral analysis, the method adds the dimension of continuous frequency representation, thereby achieving high frequency domain resolution.
2Reliability
If the main frequency energy of transmitted signals is unevenly distributed, then the signal structure is simple, but the signal-to-noise ratio of some frequencies is very low
Solution Approach 1:
The patent applies local quality by ensuring uniform energy distribution across all frequency components of the spread spectrum signal. Each frequency point within the signal bandwidth has equal energy contribution, which guarantees consistent signal-to-noise ratio across the entire frequency spectrum, unlike conventional signals with uneven energy distribution.
Solution Approach 2:
The spread spectrum signal uses periodic spreading codes (such as pseudorandom sequences) to modulate the carrier frequency. This periodic structure with uniform spectral distribution ensures that energy is evenly allocated across all frequency points, improving signal-to-noise ratio through constructive interference at the receiver.
3Reliability
If the frequency point interval is large and energy is scattered, then the measurement covers a broad frequency range, but reliable data cannot be obtained in areas with strong interference
Solution Approach 1:
The patent merges the energy from multiple frequency points into a unified continuous spectrum. By using correlation processing to combine the responses across the entire spread spectrum bandwidth, the method concentrates the distributed energy into a coherent signal that can overcome local interference, thereby improving data reliability in interference-prone areas.
Solution Approach 2:
The patent converts the potentially harmful effect of scattered energy and broad frequency coverage into a benefit through spectral correlation. The wide bandwidth provides frequency diversity that allows the system to bypass interfered frequency regions and reconstruct reliable data from non-interfered portions, turning the broad but scattered energy distribution into an anti-interference advantage.
4Measurement precision
If conventional methods calculate percent frequency effect and phase parameter, then the induced polarization parameters are obtained, but the parameters are greatly influenced by coupling resulting in data distortion
Solution Approach 1:
The patent extracts the coupling effect from the measurement by using the continuous frequency spectrum characteristic of spread spectrum signals. Through spectral analysis and comparison across multiple frequency points, the method separates and removes the coupling component from the total response, thereby obtaining undistorted induced polarization parameters.
Solution Approach 2:
The patent applies feedback by using the phase and amplitude information from the entire frequency spectrum to correct for coupling effects. The continuous spectral data provides redundant information that allows iterative refinement and compensation of coupling distortions, improving the accuracy of the final parameter extraction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively addresses the limitations of conventional techniques by providing accurate, high-resolution induced polarization parameter measurements, improving signal energy and anti-interference capabilities, and reducing coupling distortion.
Implementation Method 1
An induced polarization method is a geophysical exploration method to solve geological problems by studying the difference between the resistivity and the polarizability of rocks and minerals under the action of an electric field
Data Source
AI summary
A method and an apparatus for acquiring induced polarization parameters by using a spread spectrum signal, a medium and a device are provided, where the method includes: sending a spread spectrum signal to a detection object and acquiring time sequence data of the spread spectrum signal; acquiring a frequency spectrum value of each main frequency in the spread spectrum signal, and obtaining a normalized complex value of each main frequency based on the frequency spectrum value of each main frequency; obtaining a frequency value of each combined frequency in the spread spectrum signal; calculating a normalized complex value of each combined frequency according to the normalized complex value of each main frequency; and calculating induced polarization parameters of all combined frequencies according to frequency values of all combined frequencies and normalized complex values of all combined frequencies.