RF Localization Multi-Resolution Antenna Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
RF source localization systems face challenges in achieving high resolution and unambiguity due to cost and complexity constraints, limiting their ability to precisely track RF sources, especially in applications requiring detailed trajectory information.
Innovation Solution
A multi-resolution positioning technique that employs a combination of high-resolution and low-resolution antenna pairs to determine precise RF source locations and trajectories, using voting algorithms to resolve ambiguities and improve tracking accuracy without increasing the number of antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of antennas is increased to improve location resolution, then measurement precision is improved, but device complexity and system cost increase
Solution Approach 1:
The patent divides the antenna array into multiple sub-arrays, where each sub-array independently forms direction finding lobes. This segmentation allows the system to achieve high-resolution location measurement without requiring a single large, complex antenna array, thereby reducing overall system complexity while maintaining measurement precision.
Solution Approach 2:
The patent transitions from determining only the direction of arrival to simultaneously determining both direction and distance by measuring signal strength in addition to phase differences. This dimensional expansion in the measurement space enables improved location resolution without proportionally increasing the number of antennas required.
2Measurement precision
If antenna spacing is increased to improve trajectory tracking detail, then measurement precision is improved, but ambiguity in location determination increases
Solution Approach 1:
The patent introduces signal strength measurement as an intermediary parameter that helps disambiguate location determination. While phase differences provide directional information with potential ambiguities when antenna spacing is large, the additional signal strength measurement acts as a mediator to resolve which of the multiple possible locations is the actual source position, thereby maintaining trajectory tracking precision without losing location unambiguity.
3Loss of information
If antenna spacing is constrained to less than or equal to λ/2 to ensure single lobe formation, then location unambiguity is improved, but measurement precision deteriorates
Solution Approach 1:
The patent combines multiple measurement techniques - phase difference measurement for directional information and signal strength measurement for distance and disambiguation. By merging these complementary measurement approaches, the system can use larger antenna spacings to achieve better angular resolution while using signal strength to resolve the ambiguities that arise, thereby overcoming the limitation of small antenna spacing constraints.
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
Enables accurate localization and trajectory tracking of RF sources with sub-centimeter precision, enhancing applications such as gesture-based interfaces and virtual touchscreens, while being robust to noise and not requiring line of sight.
Implementation Method 1
determining a plurality of spatially separated candidate locations in the region for the radio frequency source; determining a sub-region of the region, the sub-region including the radio frequency source
Data Source
AI summary
A system for localization of a radio frequency source in a region includes a first plurality of antennas disposed about the region, a second plurality of antennas disposed about the region, a first radio frequency positioning module in communication with the first plurality of antennas and configured to determine a plurality of spatially separated candidate locations in the region for the radio frequency source, a second radio frequency positioning module in communication with the second plurality of antennas and configured to determine a sub-region of the region, the sub-region including the radio frequency source, and a resolution module for identifying a subset of the candidate locations in the sub-region of the region.