Dual Antenna Systems for Multipath Signal Discrimination
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Solution Overview
Problem
Traditional antennas used for receiving satellite signals, such as GPS and GLONASS, face accuracy and reliability issues due to inadequate visibility and multipath signal interference, where direct and reflected signals combine, causing timing errors and noise, which existing designs have not adequately addressed.
Innovation Solution
The use of a dual antenna system with orthogonally arranged and interconnected antennas, optimized for spatial and electrical tuning, to discriminate between left-hand and right-hand circularly polarized signals, and a method for correlating direct and reflected signals using concentrically located interleaved antenna structures, enhancing signal reception and processing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single antenna is used for receiving satellite signals, then the device complexity is low, but the measurement precision and reliability of position data deteriorate due to multipath interference and inadequate satellite visibility
Solution Approach 1:
The patent divides the antenna system into multiple antenna elements (at least two antennas) with different spatial orientations and polarization characteristics. Each antenna element is designed to receive signals with specific polarization properties, allowing the system to segment the reception function across multiple components to improve measurement precision while managing complexity through functional division
Solution Approach 2:
The patent introduces spatial dimensionality by arranging antennas in three-dimensional space with specific geometric relationships (e.g., orthogonal orientations, different heights). This spatial arrangement creates multiple reception paths and polarization angles, enabling the system to discriminate between direct and reflected signals through their different spatial and polarization characteristics
2Reliability
If traditional antenna designs are used, then the manufacturing and operation are simple, but the reliability of signal reception deteriorates in urban environments with buildings and obstacles
Solution Approach 1:
The patent employs asymmetric antenna configurations where antenna elements are positioned at different locations, orientations, and heights rather than symmetric arrangements. This asymmetry allows each antenna to capture signals from different angular perspectives and polarization states, improving reliability in urban canyons where satellite visibility is limited and multipath interference is prevalent
Solution Approach 2:
The patent designs the antenna system to perform multiple functions simultaneously: receiving satellite signals with different polarizations, discriminating between direct and reflected signals, and maintaining reception reliability across varying environmental conditions. This multi-functionality is achieved through the geometric arrangement and interconnection of multiple antenna elements
3Object-affected harmful factors
If multipath signal attenuation is attempted using traditional methods, then some noise reduction may occur, but the timing error and measurement precision worsen due to incomplete discrimination between direct and reflected signals
Solution Approach 1:
The patent implements signal processing methods that analyze the characteristics of received signals (phase, amplitude, polarization) and use this information to identify and separate multipath components from direct signals. The system processes signals from multiple antennas with different polarizations, compares their characteristics, and uses this feedback to discriminate timing and origin of each signal path, thereby reducing timing errors while attenuating multipath interference
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 solution effectively reduces multipath-induced errors, improves signal discrimination, and enhances the accuracy of positional data by correlating direct and reflected signals, providing reliable satellite signal reception even in challenging environments like urban canyons.
Implementation Method 1
an antenna system for receiving transmitted signals
Implementation Method 2
GPS signals, for example, are circularly polarized in a right-hand path (Right Hand Circularly Polarized RHCP)
Implementation Method 3
the angle and method of connection of the two antenna elements enables the antenna to reliably discriminate between left-hand and right-hand polarized circular signals
Implementation Method 4
If the signal path to the antenna includes reflection, such as from the side of a building, for example, this polarization may be inverted to left-hand polarization (Left Hand Circularly Polarized or LHCP) in the reflected portion of the signal
Data Source
AI summary
Antenna systems for receiving transmitted signals comprising at least a first tuned antenna disposed in a known relationship spatially with a second antenna, with the first tuned antenna electrically connected to the second antenna, are disclosed. The antenna system may be configured to allow the antennas to reliably discriminate between left-hand and right-hand circular signals.