RF Direction Finding via Geographic Channel Power Measurements
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Solution Overview
Problem
Existing techniques for locating sources of interference in telecommunication networks are inefficient due to the large size and limited frequency range of direction finding antennas, making it difficult to quickly identify and mitigate external interference sources, especially when they emit from great distances.
Innovation Solution
A system combining an omnidirectional antenna with a GPS antenna and a spectrum analyzer, connected to a computing device running software that uses channel power measurements and algorithms like 'min hold' and 'max hold' to narrow down the geographic location of interference sources, allowing for quicker identification and mitigation of interference without the need for directional antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If directional antennas are used for locating interference sources, then measurement precision is improved, but device complexity and time consumption increase
Solution Approach 1:
The patent replaces the mechanical directional antenna system with a software-based solution. Instead of using complex physical directional antennas to determine signal direction, the system uses an omnidirectional antenna combined with software algorithms (min hold and max hold) that process power measurements taken at different locations to calculate the interference source location mathematically, thereby substituting a mechanical system with a software-based one
Solution Approach 2:
The patent creates a virtual model of the interference source location by taking multiple power measurements at different geographic positions and using algorithms to compute the most likely source location. This virtual modeling approach replaces the need for complex physical directional antenna systems while achieving similar location accuracy
2Measurement precision
If directional antennas are used for interference location, then location accuracy is improved, but productivity decreases
Solution Approach 1:
The patent performs preliminary actions by taking multiple power measurements at different locations and storing them for later processing. The system prepares the data set in advance using the min hold and max hold algorithms, so that when interference needs to be located, the computation is already based on pre-collected data, speeding up the overall process
Solution Approach 2:
By replacing the mechanical directional antenna system with a software-based calculation approach using omnidirectional antenna measurements, the system eliminates the time-consuming process of physically rotating and positioning directional antennas, thereby increasing productivity while maintaining location accuracy
3Device complexity
If omnidirectional antenna with software algorithms is used, then device complexity is reduced, but measurement precision may worsen
Solution Approach 1:
The patent transitions from a one-dimensional directional measurement approach (using directional antennas that measure signal strength in specific directions) to a two-dimensional spatial mapping approach (using an omnidirectional antenna to take measurements at multiple geographic locations and map power levels across a spatial domain), thereby compensating for the simpler antenna design with a more comprehensive measurement strategy
Solution Approach 2:
The system uses feedback from multiple power measurements taken at different locations to iteratively refine the estimated interference source location. The min hold and max hold algorithms process this feedback data to calculate the most probable source position, ensuring high location accuracy despite using a simpler omnidirectional antenna
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 system enables faster and more efficient location of interference sources across a wide frequency range, reducing the time required to eliminate interference and improving network performance by using a single omnidirectional antenna and advanced software algorithms to track and pinpoint signal sources.
Implementation Method 1
A system combining an omnidirectional antenna with a GPS antenna and a spectrum analyzer
Implementation Method 2
uses channel power measurements and algorithms like 'min hold' and 'max hold' to narrow down the geographic location of interference sources
Implementation Method 3
A system combining an omnidirectional antenna with a GPS antenna and a spectrum analyzer
Data Source
AI summary
A method of estimating a location of an interference signal source includes using a first antenna configured to receive a signal from the interference signal source and using a second antenna arranged proximate to the first antenna and configured to receive global positioning system (GPS) signals. An initial trend in variation in power of a received signal from the interference signal source is determined relative to a position of the second antenna, wherein upon determining the initial trend, the initial trend is a current trend. In an iterative manner, the second antenna is directed to be repositioned. A secondary area associated with a lack of power measurement outside of an area traveled is identified and a further repositioning of the second antenna is determined to reduce the secondary area. An estimate of the location of the interference signal source is then determined.