GMI Magnetometer Signal Extraction for Long-Range Magnetic Communication
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Solution Overview
Problem
Existing magnetic field communication technologies have limited transmission distances, typically restricted to 10 centimeters, due to their inability to effectively detect and separate weak magnetic field signals, limiting their application in environments such as underground or underwater.
Innovation Solution
A magnetic field communication system utilizing a giant magnetoimpedance (GMI) magnetometer as a receiving device, which includes signal extractors to separate and amplify message signals from combined magnetization frequency, carrier wave frequency, and message signals, enabling longer transmission distances through a series of filtering and amplification processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If existing magnetic field communication technology is used, then the system is simple and easy to operate, but the transmission distance is limited to 10 centimeters
Solution Approach 1:
The signal extraction process is divided into multiple sequential stages: first extracting the second communication signal containing the message signal from the first communication signal, then extracting the third communication signal by removing the magnetization frequency signal, and finally extracting the message signal by removing the carrier wave frequency signal. This segmentation of the signal processing task enables extended transmission distance while managing complexity through structured decomposition
Solution Approach 2:
The GMI magnetometer serves as an intermediary device with high sensitivity at the picotesla level, detecting weak magnetic field signals that enable extended transmission distances. The magnetometer acts as a mediator between the transmitted magnetic field signal and the subsequent signal extraction processes, bridging the gap between limited existing technology and extended range communication
2Length of stationary object
If signal extractors are added to extend transmission distance, then transmission distance increases to tens or hundreds of meters, but device complexity increases
Solution Approach 1:
Multiple signal extraction functions are merged into an integrated processing chain where the first signal extractor, second signal extractor, and third signal extractor work sequentially as a unified system. This merging approach consolidates the complexity of multiple extraction operations into a coordinated process, enabling extended transmission distance while managing device complexity through functional integration
3Length of stationary object
If GMI magnetometer is used to detect weak magnetic field signals, then transmission distance is extended, but measurement precision requirements increase
Solution Approach 1:
The GMI magnetometer performs preliminary detection of weak magnetic field signals at the picotesla level before subsequent signal extraction operations. This preliminary action of high-sensitivity detection enables the system to capture faint signals from extended distances, with subsequent processing steps refining the detected signals to maintain measurement precision throughout the extended range
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 system extends transmission distances to tens or hundreds of meters by effectively extracting and amplifying message signals from the received magnetic field signals, enabling reliable communication in challenging environments.
Implementation Method 1
a giant magnetoimpedance (GMI) magnetometer configured to detect a first communication signal based on a received magnetic field signal
Implementation Method 2
a mixer configured to remove the magnetization frequency signal using a local oscillator (LO) signal having a same frequency as the magnetization frequency signal
Implementation Method 3
a low-pass filter configured to remove a harmonic component of the third communication signal
Implementation Method 4
an amplifier configured to amplify the third communication signal
Implementation Method 5
a mixer configured to remove the carrier wave frequency signal using an LO signal having a same frequency as the carrier wave frequency signal
Implementation Method 6
a low-pass filter configured to remove a harmonic component of the message signal
Implementation Method 7
an amplifier configured to amplify the message signal
Data Source
AI summary
A magnetic field communication method and apparatus using a giant magnetoimpedance (GMI) magnetometer are disclosed. The magnetic field communication apparatus includes a GMI magnetometer configured to detect a first communication signal based on a received magnetic field signal, a first signal extractor configured to extract a second communication signal comprising a message signal from the first communication signal, a second signal extractor configured to extract a third communication signal by removing a magnetization frequency signal from the second communication signal, and a third signal extractor configured to extract the message signal by removing a carrier wave frequency signal from the third communication signal.