Rogue Transmitter Localization via Propagation Loss Matrix
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining the location of wireless transmitters, especially rogue transmitters, in communication networks face challenges in accurately identifying and isolating unauthorized signals due to limited knowledge of transmitter power and signal characteristics, leading to inefficiencies in managing wireless interference.
Innovation Solution
A transmitter enforcement system utilizing a network of receivers with steerable antennas and RFICs, coupled with a remote data processing system, builds a propagation loss matrix to estimate transmitter locations by analyzing signal strength and power loss across the observation area, allowing for precise identification and potential interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal strength measurement at access points is used to determine transmitter location, then location determination is achieved, but measurement precision deteriorates due to limited knowledge of transmitter power and signal characteristics
Solution Approach 1:
The system performs preliminary actions by having access points continuously monitor and measure signal strength from all transmitters before location determination is needed. These preliminary measurements are stored and used to build propagation loss models in advance, so when a rogue transmitter needs to be located, the system already has pre-collected data to work with, improving accuracy without requiring additional real-time measurements
Solution Approach 2:
The system implements feedback by using measured signal strength data to continuously refine propagation loss models and transmitter location estimates. The location determination system compares expected signal strengths based on known transmitter powers with actual measurements, uses the differences to update propagation models, and iteratively improves location accuracy through this closed-loop feedback process
2Measurement precision
If a network of receivers with steerable antennas is deployed to improve location accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The access points in the system are designed to perform multiple functions: they serve as both communication access points for legitimate users and as monitoring receivers for detecting and locating rogue transmitters. By making the access points multi-functional, the system avoids deploying separate dedicated receiver infrastructure, thereby reducing overall device complexity while maintaining location determination capabilities
Solution Approach 2:
The system merges the communication function and the monitoring/detection function into a single integrated access point structure. The same antennas and RF infrastructure used for providing wireless access to users are also used for measuring signal strength from potential rogue transmitters, eliminating the need for separate receiver networks and reducing system complexity
3Measurement precision
If propagation loss matrix analysis is performed to accurately identify transmitter locations, then location determination accuracy improves, but loss of time increases due to extensive data processing
Solution Approach 1:
The system performs preliminary actions by pre-calculating and storing propagation loss values for all possible transmitter-receiver pairs in a propagation loss matrix before actual location determination is needed. This pre-computation includes accounting for environmental factors and path characteristics in advance, so when a rogue transmitter needs to be located, the system only needs to compare pre-existing matrix data with current measurements, dramatically reducing processing time
Solution Approach 2:
The system segments the large-scale propagation loss analysis into smaller, manageable components by creating a structured matrix that divides the observation area into discrete regions and calculates propagation characteristics for each segment independently. This segmentation allows the processing to be distributed and parallelized, reducing overall computation time while maintaining comprehensive coverage of the monitoring area
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 approach enables accurate localization of transmitters, reducing wireless interference and facilitating compliance with regulatory standards by effectively distinguishing between authorized and unauthorized signals within the communication network.
Implementation Method 1
Each receiver includes an antenna configured to receive signals from transmitters
Implementation Method 2
The repeaters are usually used to counteract the attenuation (e.g., power loss) that the signal experiences as it is being transmitted
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A method (500) for determining a location of a wireless transmitter (102, 102a-102b) includes: receiving, at data processing hardware (122), receiver signals (104) from corresponding receivers (110, 110a-110n) located within an observation area (106); estimating, by the data processing hardware, the location of the rogue transmitter; and reporting the estimated location of the rogue transmitter to a remote system (120) in communication with the data processing hardware. Estimating the location of a rogue transmitter includes, for each receiver, determining a transmitter location contour (600, 600a, 600b) about the receiver based on the corresponding at least one receiver signal and one or more propagation path loss functions and identifying an intersection of the transmitter location contours of the receivers as the estimated location of the rogue transmitter. Each propagation path loss function is based on terrain information corresponding to the observation area.