Positioning Terminal RTK Error Correction via Dead Reckoning

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Solution Overview

Problem

In urban areas with significant shielding, RTK calculations often produce erroneous fixes, leading to inaccurate positioning of moving objects.

Innovation Solution

A positioning method and terminal that calculate a dead reckoning solution based on previous fixed solutions when the difference between new and previous solutions exceeds a threshold, reducing erroneous outputs and improving accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If RTK calculation is performed in urban areas with shielding, then positioning solution can be obtained, but erroneous fixes occur frequently leading to low positioning accuracy

Engineering Contradiction:

Improvepositioning accuracyVSAvoidreliability of fixed solution

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system continuously monitors the difference between consecutive fixed solutions and uses this feedback to detect erroneous fixes. When the difference exceeds a threshold, the system identifies the solution as erroneous and switches to dead reckoning, creating a closed-loop control mechanism that adapts to changing positioning conditions in urban environments

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Dead reckoning navigation serves as an intermediary solution between satellite positioning and the actual position. When fixed solutions are unreliable due to shielding, the system uses dead reckoning based on speed and direction information to estimate position, providing a bridge that maintains positioning continuity without directly relying on problematic satellite signals

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If fixed solution is output continuously in shielding environment, then positioning service is maintained, but accuracy deteriorates due to erroneous fixes

Engineering Contradiction:

Improvepositioning service continuityVSAvoidpositioning accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The system dynamically switches between different positioning modes (fixed solution output and dead reckoning output) based on real-time assessment of solution quality. This dynamic adaptation allows the system to maintain service continuity while preserving accuracy by selecting the appropriate positioning method for current conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the output parameter from fixed solution coordinates to dead reckoning coordinates when the difference between consecutive solutions exceeds a threshold. This parameter change strategy allows the system to maintain continuous positioning service while avoiding output of erroneous high-precision-looking coordinates

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11047992B2Positioning method and positioning terminal

Publication Date: 2021.06.29 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

In a case where a magnitude of a speed difference vector is smaller than a threshold in a state where a fixed solution is obtained continuously for a first time, a processor outputs a current RTK positioning solution as current coordinates of a moving object. On the other hand, when the magnitude of the speed difference vector is equal to or greater than the threshold in a state where the fixed solution is obtained continuously for the first time, the processor outputs a DR solution as the current coordinates of the moving object.