Vehicle Position Selection for GNSS Jump-Resistant Steering

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Solution Overview

Problem

Existing vehicle position detection systems face challenges in obtaining precise own-vehicle position information due to position jumps caused by environmental factors, leading to destabilization of self-driving vehicles and sudden route changes.

Innovation Solution

A vehicle position detector system that includes a satellite positioning receiver, an autonomous navigation processor, and a selector, which determines the occurrence of position jumps and selects between autonomous navigation and satellite positioning positions based on precision, ensuring immediate and precise own-vehicle position information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If satellite positioning is used to detect own-vehicle position, then position information can be obtained, but position jumps occur due to environmental factors causing imprecision

Engineering Contradiction:

Improveown-vehicle position precisionVSAvoidposition data stability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent introduces an autonomous navigation position as an intermediary reference to detect and correct satellite positioning jumps. By comparing satellite positioning position with autonomously calculated position, the system identifies position jumps and selects appropriate position data, thereby resolving the reliability issue of satellite positioning while maintaining measurement precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system implements feedback by continuously monitoring the difference between satellite positioning position and autonomous navigation position. When a position jump is detected through this feedback mechanism, the system responds by selecting alternative position data or correcting the satellite positioning data, thus maintaining position precision despite environmental disruptions.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If position correction processes are implemented to address position jumps, then position precision can be maintained, but the processes require time longer than the update cycle causing delays

Engineering Contradiction:

Improveown-vehicle position precisionVSAvoidposition correction time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary action by continuously calculating the autonomous navigation position in advance using odometry and map information. This pre-calculated position serves as a ready reference for immediate comparison with satellite positioning data, enabling rapid detection and correction of position jumps without time-consuming processing delays.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system applies partial action by selectively correcting only when position jumps are detected through comparison, rather than continuously processing corrections. This approach maintains position precision while minimizing time loss by avoiding unnecessary correction operations during normal satellite positioning conditions.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If satellite positioning data is used during position jumps, then position information is available, but sudden route changes and destabilization of vehicle behavior occur

Engineering Contradiction:

Improvenavigation continuityVSAvoidvehicle behavior stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent implements dynamics by dynamically selecting between satellite positioning position and autonomous navigation position based on real-time comparison results. The system adapts its position source according to environmental conditions, maintaining navigation continuity while preventing destabilization by switching to reliable autonomous navigation data when satellite positioning exhibits jumps.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The autonomous navigation position acts as an intermediary buffer between satellite positioning disruptions and vehicle control systems. By mediating the position data through comparison and selection logic, the system maintains continuous navigation while filtering out unstable satellite positioning data that would otherwise cause sudden route changes and vehicle destabilization.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11334088B2Vehicle position detector, automatic steering controller, vehicle position detecting method, and automatic steering control method

Publication Date: 2022.05.17 MITSUBISHI ELECTRIC CORP

AI summary

A vehicle position detector includes: a satellite positioning receiver; an autonomous navigation processor outputting an own-vehicle position as an autonomous navigation position; a determining unit determining occurrence of a position jump on the basis of a positional difference between the autonomous navigation position and a satellite positioning position detected by the satellite positioning receiver using satellite positioning; and a selector selecting one of the autonomous navigation position and the satellite positioning position on the basis of positioning precision of satellite positioning output by the satellite positioning receiver, and a result of the determination, wherein the vehicle position detector outputs one of the autonomous navigation position and the satellite positioning position as the own-vehicle position on the basis of a result of the selection.