Radio Antenna Movement Monitoring via Doppler Spectrum Analysis

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Solution Overview

Problem

Existing methods for maintaining mechanical structures in wireless communications networks, such as radio antennas, require dedicated equipment like accelerometers and strain gauges to monitor structural vibrations, which are costly and often not invested in due to high maintenance needs, leading to potential structural failures from wind-induced oscillations.

Innovation Solution

A method using radio properties, specifically Doppler spectrum analysis, to estimate and monitor the movement of radio antennas, allowing for the detection of harmful oscillations without dedicated equipment, enabling proactive maintenance by analyzing radio transmissions to identify and classify structural vibrations and predict potential damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If dedicated equipment like accelerometers and strain gauges is used to monitor structural vibrations, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improvestructural vibration monitoring accuracyVSAvoidmonitoring system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces mechanical monitoring equipment (accelerometers and strain gauges) with a radio-based monitoring system that uses Doppler spectrum analysis of existing radio transmissions to detect structural vibrations, eliminating the need for dedicated mechanical sensors while maintaining monitoring capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses radio waves as a copy or alternative representation of the physical vibration state, where Doppler shifts in radio signals replicate the information that would otherwise require direct mechanical measurement, allowing indirect but accurate monitoring

Inventive Principle:

Principle #26Copying

2Reliability

If dedicated monitoring equipment is deployed, then reliability of structural monitoring is improved, but loss of energy and maintenance needs worsen

Engineering Contradiction:

Improvestructural monitoring reliabilityVSAvoidmaintenance energy consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent enables the radio communication system to monitor structural health as a byproduct of its normal operation, where the same radio infrastructure used for communication automatically performs monitoring functions without requiring separate powered monitoring devices that would consume additional energy and require maintenance

Inventive Principle:

Principle #25Self-service

3Ease of operation

If radio properties are used to monitor antenna movement, then ease of operation is improved, but measurement precision may worsen

Engineering Contradiction:

Improvemonitoring system operation simplicityVSAvoidmovement detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent substitutes mechanical measurement methods with radio-based Doppler analysis, which simplifies operation by using existing radio communication infrastructure while achieving precise movement detection through frequency shift analysis of radio signals reflected from or transmitted through the antenna structure

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 low-cost, efficient monitoring and maintenance of radio antennas, reducing the risk of structural damage from wind-induced oscillations and seismic activity, enabling proactive site maintenance without the need for specialized infrastructure or personnel.

Implementation Method 1

A method using radio properties, specifically Doppler spectrum analysis, to estimate and monitor the movement of radio antennas

Methodology Applied

Scientific EffectDoppler spectrum: Doppler Effect

Data Source

PatentEP3602116B1First node, third node, and methods thereby, for managing a movement of a radio antenna

Publication Date: 2024.09.25 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

Method performed by a first node (101) for managing a movement of a radio antenna (120). The first node (101) operates in a wireless communications network (100). The first node (101) determines (302) whether the movement of the radio antenna (120) is above a threshold over a time period. The radio antenna (120) is connected to a second node (102) operating in the wireless communications network (100). The movement is with respect to at least one wireless device (140) operating in the wireless communications network (100). The determining (302) is based on an analysis of one or more properties of radio transmissions to or from the radio antenna (120) over the time period. The first node (101) initiates (304) providing a message to one of: the second node (102) and a third node (103) operating in the wireless communications network (100). The initiation is based on a result of the determination.