Underground Sensor Network for Soil Moisture via Radio Attenuation
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Solution Overview
Problem
Current soil moisture measurement technologies are expensive, complex, and impractical for widespread deployment, making it difficult to obtain real-time data needed for efficient irrigation management in agricultural and urban settings.
Innovation Solution
An underground sensor network that measures soil moisture by quantifying changes in soil water content through radio signal attenuation, using wireless communication between buried sensor nodes and an aboveground gateway, which correlates signal quality with soil moisture content for data-driven irrigation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If commercial sensors and dataloggers are deployed to measure soil moisture, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex commercial sensor systems with a simplified system using radio signal attenuation measurements. Instead of using expensive commercial soil moisture sensors, the system uses wireless radio signals transmitted through the soil to detect moisture content, substituting a complex mechanical/electronic sensing system with a simpler electromagnetic wave-based measurement approach.
Solution Approach 2:
The patent uses off-the-shelf wireless communication components (radio transceivers, microcontrollers) to create soil moisture sensing functionality, rather than using specialized commercial soil moisture sensors. This copying approach uses readily available consumer electronics to achieve the measurement function, reducing complexity and cost.
2Quantity of substance
If commercial sensors are deployed in large numbers, then measurement coverage is improved, but cost increases
Solution Approach 1:
The patent employs extremely low-cost sensor nodes that can be deployed in large quantities. Each node uses inexpensive radio transceivers and minimal electronics, making them affordable to deploy at scale. The nodes are designed to be simple and inexpensive enough that large numbers can be economically deployed across agricultural fields or urban landscapes.
Solution Approach 2:
The sensor nodes use universal wireless communication protocols and off-the-shelf components that can be deployed in various settings (agriculture, urban irrigation, research) without modification. This universality allows the same hardware design to serve multiple purposes and locations, reducing per-unit cost through economies of scale.
3Ease of operation
If wireless communication is used between underground nodes, then ease of operation is improved, but reliability deteriorates due to signal attenuation
Solution Approach 1:
The system continuously monitors radio signal attenuation between nodes and uses this information to assess soil moisture conditions. By measuring the signal strength and quality, the system receives feedback about the transmission environment, allowing it to adapt to varying soil conditions and maintain reliable communication despite signal attenuation through moist soil.
Solution Approach 2:
The patent uses above-ground gateway nodes and intermediate communication relays to maintain network connectivity. When direct underground-to-aboveground communication is blocked by heavy attenuation, the system uses intermediate nodes to relay messages, ensuring reliable data transmission even when soil moisture causes signal degradation.
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 system provides cost-effective, real-time soil moisture data, enabling precise irrigation management and reducing the need for extensive wiring or infrastructure, while extending battery life with small, domino-sized sensor nodes and AI/machine learning for adaptive control.
Implementation Method 1
measures soil moisture by quantifying how changes in soil water content affect the attenuation of radio signals
Data Source
AI summary
Described herein are embodiments of a system comprising an underground sensor network that measures soil moisture by quantifying how changes in soil water content affect the attenuation of radio signals between buried sensor nodes. Also disclosed herein are methods of using the described system for measuring soil moisture and using the measurement for various control aspects including for example controlling irrigation in agricultural and urban settings.