Reflected GNSS Coherent Integration for Positioning Accuracy
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Solution Overview
Problem
Receivers struggle to accurately determine position and velocity when signals are received via reflections due to interference from buildings and other structures, leading to decreased accuracy in long coherent integration.
Innovation Solution
A receiver identifies reflected satellite positions and performs coherent integration using direction vectors adjusted for reflections, enhancing the signal-to-noise ratio of reflected signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coherent integration is performed over a long duration to improve signal-to-noise ratio, then measurement precision is improved, but the receiver becomes more sensitive to signal interference and reflections from buildings and structures
Solution Approach 1:
The patent converts the harmful effect of signal reflections into a beneficial feature by identifying reflected signals and using them for position and velocity determination. The system detects reflections from buildings and structures, determines reflected satellite positions, and performs coherent integration using direction vectors adjusted for reflections, thereby transforming the previously harmful interference into useful measurement data that can improve positioning accuracy in urban canyons and similar environments.
Solution Approach 2:
The patent introduces an intermediary approach by determining reflected satellite positions and using adjusted direction vectors as mediators between the actual satellite signals and the receiver. This intermediary processing layer allows the system to separate direct signals from reflected signals and process them differently, enabling the receiver to maintain accurate position and velocity determination even in the presence of signal interference from buildings and structures.
2Reliability
If the receiver relies on reflected signals for position determination, then availability of positioning signals is improved, but measurement precision deteriorates due to less accurate reflection-based measurements
Solution Approach 1:
The patent applies preliminary action by determining reflected satellite positions and calculating adjusted direction vectors before performing the coherent integration process. This preliminary processing of reflection information allows the system to prepare accurate measurement data in advance, which then improves the precision of position and velocity determination when the actual measurement takes place, even though the signals are reflected rather than direct.
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 accurate position and velocity determination even in areas with signal interference by increasing the signal-to-noise ratio and separating signals from different directions, thereby improving location and velocity calculations.
Implementation Method 1
performing coherent integration over a threshold duration of time to increase a signal to noise ratio for the particular positioning signal
Implementation Method 2
The reflected satellite position is determined by reflecting a position of the satellite about the reflecting plane
Data Source
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AI summary
Examples for enhancing sensitivity to reflected GNSS signals are presented herein. An example may involve identifying, by a receiver, a particular positioning signal that reflected off a reflecting plane prior to reaching the receiver. The receiver may be in motion. The example may also involve determining a reflected satellite position for a satellite that transmitted the particular positioning signal based on identifying the particular positioning signal. The reflected satellite position may be determined by reflecting a position of the satellite about the reflecting plane. The example may also involve determining a direction vector to the reflected satellite position for the satellite and performing coherent integration over a threshold duration of time to increase a signal to noise ratio for the particular positioning signal based on the direction vector to the reflected satellite position.