Single-Antenna Tensor Electromagnetic Signal Processing
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Solution Overview
Problem
Traditional artificial-source electromagnetic exploration methods require multiple transmitting sources arranged in different directions to obtain underground tensor impedance, leading to low efficiency and high costs, especially in complex terrains and for three-dimensional geological exploration.
Innovation Solution
A method and device for collecting and processing tensor artificial-source electromagnetic signal data using a single antenna, determining electric field polarization direction, collecting and Fourier-transforming signals, calculating underground tensor impedances via the least square method, and rotating them for three-dimensional analysis, thereby simplifying field construction and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple transmitting sources are arranged in different directions to obtain underground tensor impedance, then the completeness of tensor impedance data is improved, but the field construction complexity and cost increase
Solution Approach 1:
The patent changes the measurement parameters by using a single transmitting source to sequentially transmit electromagnetic signals in different directions (different azimuths) instead of using multiple simultaneous transmitting sources. This parameter change allows obtaining complete tensor impedance data through time-multiplexed measurements, reducing field construction complexity while maintaining measurement completeness
Solution Approach 2:
The patent employs periodic action by having a single transmitting source alternately transmit electromagnetic signals in different directions over time. The transmitting source periodically switches between different transmission directions to collect data from all necessary orientations, achieving tensor impedance measurement without requiring multiple permanent transmitting installations
2Measurement precision
If multiple transmitting sources are used to transmit signals in different directions, then the accuracy of three-dimensional geological exploration is improved, but the working efficiency decreases
Solution Approach 1:
The patent uses periodic action where a single transmitting source sequentially transmits signals in different directions at different time intervals. This allows the system to maintain high measurement accuracy for three-dimensional exploration while improving working efficiency by using one transmitting source instead of coordinating multiple sources simultaneously
Solution Approach 2:
The patent applies preliminary action by pre-planning the transmission sequence and azimuth angles before fieldwork. The measurement program is designed in advance to specify the order of transmission directions and the receiving array configurations, enabling efficient execution without real-time complex coordination
3Ease of manufacture
If traditional WEM or CSAMT methods are used with single antenna transmission, then the field construction cost is reduced, but the ability to obtain tensor impedance is lost
Solution Approach 1:
The patent makes the single transmitting antenna universal by enabling it to perform multiple functions: transmitting electromagnetic signals in different directions sequentially, replacing the need for multiple dedicated transmitting sources. This multi-functionality allows the system to obtain complete tensor impedance data while maintaining the cost advantages of single-antenna configurations
Solution Approach 2:
The patent introduces an intermediary element - the controllable transmitting source that can switch transmission directions - which mediates between the simple single-antenna configuration and the requirement for multi-directional tensor impedance measurement. This intermediary capability allows the system to achieve tensor impedance measurement without requiring multiple permanent transmitting installations
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
This approach allows for efficient acquisition of underground tensor impedances using a single antenna, significantly reducing costs and improving working efficiency while enabling three-dimensional geological exploration.
Implementation Method 1
an electromagnetic receiver is used to respectively collect artificial-source electromagnetic field signals and natural-field-source electromagnetic field signals in the measuring area
Implementation Method 2
the collected electromagnetic field signals are Fourier-transformed, thereby obtaining the electromagnetic field values Exs, Eys, Hxs, and Hys corresponding to the artificial source
Implementation Method 3
according to the determined polarization direction of the electric field in the measuring area, electromagnetic field sensors are arranged at different measuring points in the measuring area
Data Source
AI summary
A method for collecting and processing the tensor artificial-source electromagnetic signal data and a device thereof; the method comprising the steps of: step S1: determining an electric field polarization direction in a measuring area, and arranging electromagnetic field sensors according to the electric field polarization direction in the measuring area, step S2: respectively collecting artificial-source electromagnetic field signals and natural-field-source electromagnetic field signals, step S3: respectively Fourier-transforming the collected electromagnetic field signals, thereby obtaining the electromagnetic field values corresponding to the artificial source, and the collected electromagnetic field signals corresponding to n groups of natural sources, step S4: calculating to obtain the underground tensor impedances according to the electromagnetic field values corresponding to the artificial source and the electromagnetic field signals corresponding to n groups of natural sources that are obtained based on the least square method, step S5.