GPS Signal Correlation for Non-Translational Movement Detection

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Solution Overview

Problem

Existing electronic devices that receive positioning signals and calculate locations, such as smartphones and navigation systems, face inaccuracies in determining movement states due to the sensitivity of acceleration sensors to impact, vibration, and temperature changes, leading to incorrect determinations.

Innovation Solution

A method involving correlation calculations on received positioning signals to estimate erroneous frequencies, determining if they satisfy a predetermined condition, and adjusting the method of location calculation or display control based on whether the device is in a non-translational movement state, where the device moves relative to the user's body, using a combination of correlation units, estimation units, determination units, and control changing units.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the movement state is determined based on acceleration sensor detection results, then the movement state can be determined, but the determination accuracy is low due to sensitivity to impact, vibration, and temperature changes

Engineering Contradiction:

Improvemovement state determination accuracyVSAvoidsensitivity to impact, vibration, and temperature changes

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical acceleration sensor-based movement detection system with a signal processing system that uses correlation calculation on positioning signals. This substitution eliminates the mechanical sensor that is sensitive to environmental disturbances, achieving more accurate movement state determination without being affected by impact, vibration, or temperature changes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces correlation calculation as an intermediary process between receiving positioning signals and determining movement state. By calculating correlation values and analyzing frequency characteristics through this intermediary step, the system can accurately detect movement patterns without directly relying on noisy acceleration sensor data.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If correlation calculation is performed on positioning signals to determine movement state, then determination accuracy improves, but calculation complexity increases

Engineering Contradiction:

Improvemovement state determination accuracyVSAvoidcalculation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent performs preliminary correlation calculation on received positioning signals to extract frequency characteristics before making movement state determination. By pre-processing the signals through correlation calculation and storing the results, the system reduces the complexity of the final determination step while maintaining high accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent performs correlation calculation for multiple frequencies and analyzes the results to determine movement state. By conducting partial calculations at different frequencies and selecting the most relevant information, the system achieves accurate determination without performing excessive unnecessary calculations.

Inventive Principle:

Principle #16Partial or excessive action

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 precise detection of non-translational movement states, improving the accuracy of location calculations and display controls by distinguishing between translational and non-translational movements, even in environments with disturbance factors.

Implementation Method 1

performing correlation calculation on the received positioning signal based on a given predicted frequency

Methodology Applied

Scientific EffectCorrelation calculation:

Implementation Method 2

estimating an erroneous frequency of the predicted frequency using carrier phase of the positioning signal based on a result of the correlation calculation

Methodology Applied

Scientific EffectCarrier phase:

Implementation Method 3

receives positioning signals, and calculates a location

Methodology Applied

Scientific EffectPositioning signal reception:

Data Source

PatentUS9405014B2Method of controlling electronic apparatus and electronic apparatus

Publication Date: 2016.08.02 SEIKO EPSON CORP

AI summary

Correlation calculation is performed on a received signal of a GPS satellite signal as a positioning signal based on a given predicted frequency. Then, an erroneous frequency of the predicted frequency is estimated using carrier phase of the GPS satellite signal based on a result of the correlation calculation. Then, whether or not the erroneous frequency satisfies a predetermined allowable condition is determined, and whether or not an electronic apparatus is in a non-translational movement state in which the electronic apparatus moves while changing the location thereof with respect to a body of the user is determined.