Magnetic Field Localization Using Orthogonal Pseudo-Random Coil Signals

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Solution Overview

Problem

Global Navigation Satellite Systems (GNSS), such as GPS, face limitations in accuracy and susceptibility to jamming or spoofing in areas with poor satellite signals, necessitating the development of complementary positioning methods that operate independently.

Innovation Solution

A local positioning system (LPS) utilizing a base station transmitter with wire coils generating magnetic fields encoded with orthogonal pseudo-random sequences, allowing receivers to determine their location based on measured magnetic data vectors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If GPS is used for positioning, then positioning is available globally, but accuracy deteriorates in areas with poor satellite signals

Engineering Contradiction:

Improveglobal positioning availabilityVSAvoidpositioning accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent divides the positioning system into two independent parts: a base station transmitter that generates magnetic fields and a receiver that measures them. This segmentation allows the system to operate independently of GPS satellites, providing local positioning capability that complements or replaces GPS in areas with poor satellite signals.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces magnetic fields as an intermediary medium for positioning. Instead of relying directly on satellite signals, the system uses magnetic fields generated by the base station transmitter as a mediator to transmit positioning information to the receiver, enabling accurate positioning in GPS-denied areas.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If GPS is used for positioning, then positioning is available worldwide, but the system becomes susceptible to jamming or spoofing

Engineering Contradiction:

Improveglobal coverageVSAvoidsecurity against jamming and spoofing

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent uses magnetic fields as an intermediary that is difficult to jam or spoof compared to electromagnetic satellite signals. The magnetic fields are generated locally by the base station transmitter, creating a positioning system that is more resistant to external interference and authentication attacks.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the electromagnetic satellite-based positioning system with a magnetic field-based system. This substitution leverages the different physical properties of magnetic fields, which are more challenging to manipulate for jamming or spoofing purposes, thereby improving security and reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If a local positioning system uses magnetic waveforms with orthogonal pseudo-random sequences, then positioning accuracy and synchronization improve, but device complexity increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent designs the base station transmitter and receiver to perform multiple functions: generating and measuring magnetic fields, encoding and decoding pseudo-random sequences, and determining position. This multi-functionality reduces the need for separate dedicated components, thereby managing system complexity while maintaining high positioning accuracy.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses orthogonal pseudo-random sequences with specific waveform periods and frequencies as key parameters. By carefully selecting these parameters, the system achieves improved synchronization and positioning accuracy while keeping the complexity manageable through standardized parameter sets rather than requiring complex adaptive algorithms.

Inventive Principle:

Principle #35Parameter changes

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 LPS provides accurate positioning and synchronization performance, enabling localization in areas with limited or no GPS signals, enhancing navigation capabilities.

Implementation Method 1

Each wire coil is configured to be electrically driven by a respective synchronous electric current carrying a respective train of pseudo-random waveforms

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12625200B2Navigation via magnetic field localization with pseudo-random data sequences

Publication Date: 2026.05.12 SB TECH INC

AI summary

This application is directed to a local positioning system having a plurality of wire coils. Each wire coil includes one or more respective turns of wire that have a respective shape and a respective size and are arranged substantially in parallel with a respective wire plane. Each wire coil is configured to be electrically driven by a respective synchronous electric current carrying a respective train of pseudo-random waveforms according to a predefined bandwidth. For each wire coil, the respective train of pseudo-random waveforms includes a first number of waveform periods and is orthogonal to each other train of pseudo-random waveforms of the wire coils. In some embodiments, a receiver system is coupled to, and measures, the magnetic field created by the wire coils during each waveform period. The location of the receiver system is determined based on measured magnetic data vectors of the magnetic field.