Roadside Data Exchange Network for GPS Calibration

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Solution Overview

Problem

Current GPS systems face precision errors due to multipath interference, especially in urban areas far from reference stations, and incur high costs for setting up reference stations and overloading of mobile networks when multiple users download calibration data simultaneously.

Innovation Solution

A roadside data exchange network of devices equipped with GPS systems, calculators, and databases that periodically receive and broadcast satellite data, allowing electronic devices to communicate via DSRC protocol to acquire localized calibration values, reducing the need for mobile network connections and enhancing positioning precision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If reference stations are set up in spacious areas for differential GPS calibration, then GPS positioning precision is improved, but the cost of setting up reference stations increases and the coverage area is limited

Engineering Contradiction:

ImproveGPS positioning precisionVSAvoidcost of setting up reference stations

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent divides the single reference station into multiple roadside data exchange devices distributed along road networks. Each device independently provides calibration data for its surrounding area, segmenting the calibration function across multiple locations to reduce individual device costs and expand coverage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from sparse spatial distribution of reference stations to dense linear distribution along road networks. By utilizing the one-dimensional road network structure, the system achieves broader coverage and lower per-unit costs while maintaining positioning precision.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If users download calibration data from server through mobile network, then GPS calibration is achieved, but network cost increases and server may be overloaded

Engineering Contradiction:

ImproveGPS calibration accuracyVSAvoidnetwork connection cost

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

Roadside data exchange devices automatically perform calibration data processing and exchange with each other through direct communication. Users can obtain calibration data from nearby roadside devices without requiring server access, making the system self-sufficient and eliminating mobile network costs.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Roadside data exchange devices serve as intermediaries between the original reference station data source and end users. These intermediaries cache and share calibration data locally, eliminating the need for users to directly connect to distant servers through costly mobile networks.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If reference station is located far from urban areas, then complete satellite data can be collected, but the calibration result becomes less accurate for urban users

Engineering Contradiction:

Improvesatellite data completenessVSAvoidcalibration accuracy for urban users

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent implements local calibration data generation at multiple roadside locations throughout urban areas. Each roadside device produces calibration data specific to its local environment, ensuring that urban users receive calibration values that accurately reflect their specific geographic and environmental conditions.

Inventive Principle:

Principle #3Local quality

4Productivity

If multiple users download calibration data simultaneously from server, then all users can acquire GPS calibration, but server becomes overloaded causing service problems

Engineering Contradiction:

Improvenumber of users servedVSAvoidserver service stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the centralized server function into distributed roadside data exchange devices. Each roadside device independently serves local users, dividing the service load across multiple nodes and eliminating the single-point overload problem that occurs with centralized server architecture.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8768619B2Road side data exchange net and method thereof

Publication Date: 2014.07.01 NATIONAL TSING HUA UNIVERSITY

AI summary

A road side data exchange net and method thereof is provided. The road side data exchange net includes a plurality of road side data exchange devices set on neighboring roads separately. The road side data exchange device includes a positioning system for receiving satellite data regularly, a calculator for calculating a calibration value of the satellite data to generate an analyzed result data, and a database for storing the analyzed result data. Further, each of the road side data exchange devices broadcasts the analyzed result data from its database to all of neighboring road side data exchange devices to provide the analyzed result data to an electronic device.