GNSS Positioning Augmentation Device Ranging Error Calculation

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Solution Overview

Problem

Existing techniques for centimeter-level positioning using GNSS satellite systems face challenges in accurately calculating ranging errors in phase pseudoranges, which are crucial for reliable augmentation information.

Innovation Solution

A positioning augmentation device that includes a correction generation unit, a reference calculation unit, and a ranging error calculation unit to generate and calculate corrections for phase pseudoranges, removing ambiguity biases to achieve accurate ranging error calculations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If pseudorange correction is used for positioning augmentation, then positioning coverage is improved, but positioning accuracy deteriorates (cannot achieve centimeter level)

Engineering Contradiction:

Improvepositioning coverageVSAvoidpositioning accuracy

Core Design Contradiction:

Area of stationary objectVSMeasurement precision

Solution Approach 1:

The patent changes the parameter from code pseudorange to carrier phase pseudorange. Carrier phase measurements provide much higher precision (centimeter level) compared to code pseudorange measurements. By generating correction amounts based on carrier phase observations and applying them to carrier phase pseudoranges, the system achieves both wide coverage and centimeter-level accuracy simultaneously.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If integrity monitoring is implemented for centimeter level positioning, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improveintegrity monitoring capabilityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements integrity monitoring by calculating ranging errors as feedback information. The correction amount calculation unit computes the difference between the actual carrier phase observation and the corrected carrier phase pseudorange, generating ranging error data that reflects the quality and reliability of the positioning correction. This feedback mechanism enables integrity monitoring without requiring fundamentally new system components.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces ranging error as an intermediary parameter that mediates between the correction amount and the positioning result. By calculating and providing ranging error information, the system enables integrity monitoring functionality without directly complicating the core correction generation process. The ranging error serves as a quality indicator that can be used by receivers to assess positioning reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If bias component due to ambiguity is not removed, then calculation simplicity is maintained, but ranging error accuracy deteriorates

Engineering Contradiction:

Improvecalculation simplicityVSAvoidranging error accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent extracts and removes the bias component due to ambiguity from the correction amount calculation. The correction amount calculation unit specifically eliminates this systematic error component before generating the final correction amount. This extraction process improves ranging error accuracy by eliminating a known source of bias, while the removed bias component can be separately handled or accounted for without complicating the main calculation flow.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11175411B2Positioning augmentation device, positioning augmentation method, and computer readable medium

Publication Date: 2021.11.16 MITSUBISHI ELECTRIC CORP

AI summary

A correction generation unit generates an amount of correction for a phase pseudorange between a positioning satellite and each of a plurality of evaluation points, as an amount of evaluation point correction for each of the plurality of evaluation points, based on a carrier phase of a positioning signal observed at each of a plurality of electronic reference points. A reference calculation unit calculates a difference between the phase pseudorange between the positioning satellite and each of the plurality of evaluation points and a geometric distance between the positioning satellite and each of the plurality of evaluation points, as an amount of reference correction for each of the plurality of evaluation points. A ranging error calculation unit removes a bias component due to ambiguity from a difference between the amount of evaluation point correction and the amount of reference correction and thereby calculates a ranging error at each of the plurality of evaluation points.