Multi-Frequency Utility Locator Signal Processing
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Solution Overview
Problem
Traditional utility line locating methods are limited as they typically use either active or passive signals, but not both simultaneously, and often rely on single-frequency detection, which can lead to inaccurate location of buried utilities, resulting in costly damage and safety risks.
Innovation Solution
The development of combined passive and active signal locating devices and systems that receive and process electromagnetic signals at multiple frequencies, including both active and passive signal suites, to refine the determination of utility location, depth, and type by comparing signal solutions at different geographical locations using methods like PCA and ICA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single-frequency detection is used, then device complexity is reduced, but measurement precision deteriorates leading to inaccurate utility location
Solution Approach 1:
The patent segments the electromagnetic spectrum into multiple discrete frequency channels (e.g., 50Hz, 60Hz, 400Hz, 800Hz, 1600Hz, 3200Hz, 6400Hz, 12800Hz) that are processed independently through separate signal paths. Each frequency channel has its own detection and processing circuitry, allowing parallel analysis of multiple frequencies without overwhelming a single processing channel. This segmentation enables accurate utility location by comparing signals across frequencies while keeping individual processing paths manageable.
Solution Approach 2:
The patent adds the frequency dimension to traditional single-frequency detection by simultaneously analyzing signals across multiple frequency channels. Instead of processing one frequency at a time, the system creates a multi-dimensional signal space where each utility signal can be characterized by its frequency spectrum. This dimensional expansion allows the system to distinguish between different signal sources and improve location accuracy without proportionally increasing processing complexity at each individual frequency.
2Adaptability or versatility
If only active signals are used, then signal strength is improved, but adaptability deteriorates as passive signals from different sources cannot be detected
Solution Approach 1:
The patent creates a universal detection system that can identify and process multiple types of signal sources through a single multi-frequency platform. The system detects active signals from utility transmitters, passive signals from power lines, and passive signals from radio broadcast stations simultaneously by analyzing multiple frequency channels. Each frequency channel can be independently configured to optimize detection for different signal types, making the system adaptable to various utility locating scenarios while maintaining reliable detection through consistent multi-frequency analysis protocols.
3Measurement precision
If multiple frequencies are processed simultaneously, then measurement precision is improved, but use of energy increases due to continuous multi-frequency signal processing
Solution Approach 1:
The patent implements periodic scanning across multiple frequency channels rather than continuous processing of all frequencies simultaneously. The system cycles through different frequency groups in sequential periods, analyzing a subset of frequencies during each time window. This periodic approach maintains measurement precision by ensuring all frequencies are regularly sampled while significantly reducing instantaneous power consumption compared to continuous multi-frequency processing. The scanning period is optimized to balance detection accuracy requirements with energy conservation.
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 enhances the accuracy of utility location and depth determination by synergistically processing both active and passive signals, allowing for simultaneous detection of multiple frequencies, thereby reducing the risk of damage and improving safety.
Implementation Method 1
an antenna array for receiving magnetic field signals from a buried utility in two or more orthogonal directions
Data Source
AI summary
A method for locating buried utilities in a utility locator is disclosed. The method may include receiving, at an antenna array for receiving magnetic field signals, a plurality of magnetic field signals at predefined signal frequencies in a predefined frequency suite, generating, in a receiver coupled to an output of the antenna array, a first receiver output signal, generating, in a processing element coupled to the receiver, a first set of data associated with the two or more signal components, and storing, in a non-transitory memory of the locator, the first set of data.