Antenna Phase Variation Correction for Vehicle Navigation
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Solution Overview
Problem
Non-geodetic antennas used in vehicle navigation systems often have significant phase variations that make decimeter or centimeter-level position determination impractical due to impractical phase variations, which are not accounted for in existing technologies.
Innovation Solution
A method and system that corrects positioning signals received by non-geodetic antennas by determining the angle of arrival and applying phase corrections, using look-up tables for code-phase and carrier-phase corrections to produce phase-corrected signals for precise location determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-geodetic antennas are used, then cost is reduced, but position determination precision deteriorates due to phase variations
Solution Approach 1:
The patent changes the parameter of phase correction by applying angle-specific correction values to compensate for the antenna's phase variations. By retrieving correction values from a look-up table based on the signal's angle of arrival and applying these corrections to the received signals, the system maintains centimeter-level position determination precision while using cost-effective non-geodetic antennas.
2Measurement precision
If phase correction is applied, then position determination precision is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing phase correction values in a look-up table during the antenna design and manufacturing phase. The correction values for various angles of arrival are determined in advance and stored, eliminating the need for complex real-time phase variation calculations during position determination, thus reducing operational complexity while maintaining precision.
Solution Approach 2:
The patent introduces an intermediary element - the look-up table containing pre-computed phase correction values - that mediates between the received signal and the position calculation. This intermediary allows the system to apply precise phase corrections without implementing complex real-time phase variation models, simplifying the overall system architecture.
Data Source
AI summary
A positioning method includes: receiving a positioning signal at a receiver from a positioning satellite; determining an angle of arrival of the positioning signal relative to the receiver; applying a phase correction to the positioning signal, based on the angle of arrival, to produce a phase-corrected signal; and determining a location of the receiver using the phase-corrected signal.