GNSS Antenna Support Layout for Accurate Revolving Machine Positioning
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Solution Overview
Problem
In construction machines with a lower traveling body and an upper revolving body, attaching GNSS antennas to the upper revolving body results in changing antenna positions with the revolving angle, necessitating multiple antennas for accurate positioning. Additionally, when antennas are covered, they may not receive GNSS satellite signals properly.
Innovation Solution
A construction machine configuration featuring a lower traveling body and an upper revolving body with a base body and antenna support posts that securely attach a pair of GNSS antennas at fixed positions, ensuring unobstructed reception of GNSS signals and maintaining accurate machine positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GNSS antenna is attached to the upper revolving body, then the antenna is protected and covered, but the position of the antenna changes according to the revolving angle, making it difficult to obtain accurate position information
Solution Approach 1:
The invention divides the antenna system into two separate antennas: one attached to the upper revolving body for protection, and another attached to the lower traveling body for stable position reference. This segmentation allows each antenna to serve its specific function without compromise.
Solution Approach 2:
The invention introduces a direction detector as an intermediary component that detects the revolving angle of the upper body and provides correction information to the position calculator. This intermediary enables accurate position determination despite the moving antenna position.
2Reliability
If the GNSS antenna is covered by another member, then the antenna is protected, but radio waves from GNSS satellites cannot be properly received
Solution Approach 1:
The invention places one antenna on the lower traveling body which is not covered by the upper revolving body, ensuring unobstructed radio wave reception while the other antenna on the upper body provides protection and redundancy.
Solution Approach 2:
The invention positions antennas in different spatial dimensions - one on the upper revolving body and another on the lower traveling body - so that at least one antenna maintains an unobstructed path to GNSS satellites regardless of the upper body's revolving position.
3Measurement precision
If two GNSS antennas are installed to obtain accurate position, then position accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The invention makes the upper antenna serve dual functions: it provides protected GNSS signal reception and simultaneously acts as a reference for detecting the upper body's revolving angle through its position change, reducing the need for separate sensing systems.
Solution Approach 2:
The moving antenna on the upper revolving body serves itself by providing both position data and revolution angle information, eliminating the need for additional dedicated sensors and reducing overall system complexity.
Data Source
AI summary
A revolving work vehicle includes a lower traveling body and an upper revolving body. The upper revolving body is revolvably supported by the lower traveling body. The upper revolving body comprises: a roof; rear-side support columns; a base body; antenna support columns; and GNSS antennas. The roof is disposed above an operator's seat. The rear-side support columns are disposed as a pair and extend upwards from the rear section of the upper revolving body so as to support the roof. The base body is attached to both of the pair of rear-side support columns so as to connect the pair of rear-side support columns to each other. The antenna columns are disposed as a pair and extend upwards from the base body at positions which do not overlap with the roof in a plan view. The GNSS antennas are disposed as a pair.