GPS Speed Reliability via Walking Tempo Correlation

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Solution Overview

Problem

Existing methods for determining traveling speed using GPS signals are prone to errors, particularly in environments with low signal strength, where normal speeds may be incorrectly identified as abnormal and vice versa, leading to inaccurate reliability evaluations.

Innovation Solution

An information processing apparatus and method that calculates traveling speed and evaluates reliability using a walking tempo, which is correlated with the GPS speed, to distinguish between reliable and unreliable GPS data, thereby improving accuracy in determining abnormal speeds and enhancing data reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If GPS signal is used to calculate traveling speed, then positioning function is provided, but measurement precision deteriorates in environments with low signal strength

Engineering Contradiction:

Improvereliability of GPS dataVSAvoidprecision of traveling speed

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent introduces walking tempo as an intermediary parameter to bridge GPS speed and actual traveling speed. By comparing GPS speed with walking tempo-derived speed, the system can identify and filter out unreliable GPS data, thus improving measurement precision without sacrificing the positioning function

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system establishes a feedback mechanism where walking tempo information is continuously monitored and used to validate GPS speed readings. When GPS speed deviates significantly from expected values based on walking tempo, the system can correct or discard the erroneous data, improving reliability in low signal environments

Inventive Principle:

Principle #23Feedback

2Measurement precision

If threshold-based abnormal speed determination is used, then abnormal speeds can be identified, but determination accuracy deteriorates due to false positives and false negatives

Engineering Contradiction:

Improveaccuracy of abnormal speed determinationVSAvoidreliability of speed evaluation

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent changes the evaluation parameter from absolute speed threshold to relative speed deviation based on walking tempo. Instead of fixing a threshold value, the system dynamically determines abnormal speeds by comparing GPS speed against speed expectations derived from walking tempo, thereby improving determination accuracy and reducing false positives

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8898009B2Information processing apparatus, information processing method, and program

Publication Date: 2014.11.25 SONY GROUP CORP

AI summary

There is provided an information processing apparatus including a speed calculating section configured to calculates a traveling speed of a user based on a signal received from a positioning signal transmitter, a walking tempo acquiring section configured to acquire a walking tempo of the user, and an evaluating section configured to evaluate, based on the walking tempo and the traveling speed, reliability of information calculated by using the signal received from the positioning signal transmitter.