GNSS Positioning System Phase Center Variation Compensation
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Solution Overview
Problem
Current positioning systems for land vehicles face challenges in achieving high-precision GNSS positions with low technical effort and cost, as they often require complex multi-antenna arrangements and extensive phase center correction data.
Innovation Solution
A positioning system utilizing a processing unit, a single or dual antenna element, and a phase-center-variation-matrix stored in memory, which records correction data for each antenna element's relevant angles and bands, along with rotation and tilt angle detection, allows for high-precision GNSS computations with minimal hardware and effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna element is used for GNSS positioning, then the system complexity and cost are reduced, but the positioning precision deteriorates due to phase center variations
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing phase center variation patterns for the antenna element in a lookup table during system setup. These pre-computed correction values are then retrieved and applied during actual positioning operations, eliminating the need for real-time complex calculations and enabling high precision positioning with a single antenna element.
2Measurement precision
If phase center correction is implemented for high-precision positioning, then positioning precision is improved, but the device complexity and cost increase due to multiple antennas and extensive correction data
Solution Approach 1:
The patent extracts only the essential correction information (phase center variation patterns) for a single antenna element and stores it in a compact lookup table. This selective extraction of necessary correction data eliminates the need for complex multi-antenna arrangements while maintaining high positioning precision through efficient use of minimal correction data.
3Measurement precision
If multiple antenna elements are used to improve positioning accuracy, then positioning precision is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent uses a single, simple, and inexpensive antenna element instead of multiple complex antennas. By compensating for the limitations of this simple antenna through pre-computed phase center correction data stored in a lookup table, the system achieves high positioning accuracy while maintaining ease of manufacture and low cost.
Data Source
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AI summary
The invention is related to a positioning system (PS) for a land vehicle (LV) comprising: a processing unit (PU) for computing data and for output of high-precision GNSS positions, an antenna (A) with at least one antenna element (AE1, AE2) for reception of GNSS signals in at least a first band, a GNSS receiver (GRV) for output of antenna data to the processing unit (PU), a memory (M) with a stored phase-center-variation-matrix (PCVM) for the at least one antenna element (AE1, AE2) and for output of correction data (CD) of the phase-center-variation-matrix (PCVM) to the processing unit (PU), a rotation angle detection apparatus (RAD) for providing the processing unit (PU) with rotation angle data to the processing unit and a tilt angles detection apparatus (TAD) for providing the processing unit with tilt angles data.