Multipath Mitigation in Positioning Systems via Angular Signal Segmentation
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Solution Overview
Problem
Conventional satellite navigation systems face significant accuracy degradation due to multipath interference, where signals are reflected from objects before reaching the receiver, causing incorrect distance calculations and signal interference.
Innovation Solution
A receiver with an antenna configured to distinguish between signals received at different angles, featuring a multipath compensation module that selects and combines antenna signals to reduce phase differences and noise levels, thereby identifying and mitigating multipath interference by adjusting gain and phase to maintain optimal signal-to-noise ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional antenna reception is used, then signal reception is simple, but positioning accuracy is degraded due to multipath interference
Solution Approach 1:
The antenna output is segmented into multiple antenna signals corresponding to different incident angle ranges. The multipath compensation module divides the reception space into angular sectors, processing each sector separately to identify and eliminate multipath components while maintaining simple hardware architecture.
Solution Approach 2:
The patent introduces the incident angle dimension to distinguish between direct and multipath signals. By analyzing signals from different angular perspectives and combining them through phase adjustment, the system separates line-of-sight components from reflected components without adding physical antenna elements.
2Reliability
If antenna signals are combined to compensate multipath, then positioning accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The system processes only the necessary portion of antenna signals for multipath compensation. By selecting specific antenna signals based on incident angle ranges and applying phase adjustments only where needed, the system achieves effective multipath mitigation without fully processing all possible signal combinations.
Solution Approach 2:
The patent changes the phase parameter of antenna signals to compensate for multipath effects. By adjusting phase values based on incident angle and signal characteristics, the system improves signal quality and isolates direct line-of-sight components without requiring complex hardware modifications.
3Measurement precision
If phase differences between antenna signals are reduced, then direct signal isolation is improved, but processing time increases
Solution Approach 1:
The system performs preliminary phase adjustment on antenna signals before combining them. By pre-calculating and applying phase corrections based on incident angle ranges, the system prepares signals for efficient combination and direct signal isolation, reducing the time required for final processing.
Data Source
AI summary
An apparatus for receiving positioning signals comprises an antenna configured to output a plurality of antenna signals and a multipath compensation module for detecting multipath interference, and if multipath interference is detected, selecting one or more of the antenna signals and combining the selected one or more antenna signals to obtain a compensated signal. The antenna is arranged to distinguish between ones of the positioning signals received at different incident angles, and each antenna signal includes ones of the positioning signals received in a predetermined range of incident angles. The multipath compensation module may determine whether multipath interference is present in each antenna signal, and may not select any antenna signals which include interference when selecting the antenna signals to be combined. The gain of each antenna signal may be adjusted before the signals are combined, to maintain the noise power of each antenna signal below a predetermined limit. The phase of each antenna signal may be adjusted before the signals are combined, to reduce phase differences between the antenna signals.