GNSS Multipath Detection via Signal Parameter Deviation
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Solution Overview
Problem
Current GNSS receivers face challenges in accurately detecting multipath effects, which cause deviations in position determination due to signal interference, particularly in motor vehicles where computing power is limited and cost-effective solutions are needed.
Innovation Solution
A method using a GNSS receiver to detect multipath effects by determining a parameter from received signals, comparing current parameter values to a constant target value, and identifying deviations to determine if signals have been reflected, utilizing differences in travel-time measurements and accounting for atmospheric influences, with low computing costs and adaptable threshold settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex multipath detection methods are used to improve position determination accuracy, then measurement precision is improved, but device complexity and computing costs increase
Solution Approach 1:
The patent segments the multipath detection process into distinct phases: signal reception from multiple satellites, parameter determination (comparing signal characteristics), and evaluation against threshold values. This segmentation allows complex detection to be broken into manageable computational steps that can be executed efficiently on cost-effective hardware.
Solution Approach 2:
The patent introduces an intermediary parameter comparison mechanism that indirectly detects multipath effects by comparing parameters from different signal pairs rather than directly analyzing complex signal interference patterns. This intermediary approach simplifies the computational burden while maintaining detection accuracy.
2Measurement precision
If more sophisticated signal processing is applied to detect multipath effects, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The patent applies partial action by performing multipath detection only on selected signal pairs that meet specific criteria, rather than processing all possible satellite signal combinations. This selective approach reduces computational energy consumption while maintaining effective multipath detection when it occurs.
Solution Approach 2:
The system uses the naturally received signals from multiple satellites to self-detect multipath effects through parameter comparison, without requiring additional active transmission or complex external processing. The existing signal infrastructure serves the dual purpose of position determination and multipath detection.
3Measurement precision
If traditional multipath detection methods are used, then measurement precision may be improved, but ease of operation deteriorates due to complexity
Solution Approach 1:
The patent implements feedback by continuously monitoring parameter values from signal pairs and comparing them against threshold values, automatically adjusting detection decisions based on real-time measurements. This feedback mechanism simplifies operation by providing automatic, real-time multipath detection without requiring complex manual configuration or intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for efficient detection of multipath effects with low computational costs, improving position determination accuracy in GNSS systems by identifying signal deviations and accounting for atmospheric influences, while being adaptable to various satellite navigation systems.
Implementation Method 1
The term multipath will be used hereinafter as a synonym for multiway propagation. It describes the circumstance in which a signal, e.g. from a satellite, reaches the receiver not only on the direct path, but also indirectly after it has previously been reflected against an object in the environment.
Implementation Method 2
This circumstance is not only applicable to satellite signals, but also to any signals transmitted by electromagnetic waves
Data Source
AI summary
A method for detecting a multipath effect in a GNSS receiver which is designed to receive different signals from a GNSS satellite and includes a parameter which is determined from directly received signals and has a substantially constant target value, including the steps receiving at least two mutually independent signals; determining a current parameter value from at least the first and the second signal; evaluating the parameter value in relation to the target value, and detecting a multipath effect when the parameter value has a deviation (ΔK) which deviates from the already known target value.