Grid of Linear Antennas for RF Emitter Geolocation
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Solution Overview
Problem
Traditional geolocation techniques for radio frequency (RF) signals within structures or areas face challenges due to signal blocking, attenuation, and reflection by materials, making it difficult to determine the position of an unauthorized and uncooperative RF emitter.
Innovation Solution
A system using a grid or series connected linear antennas, such as leaky signal cables, strategically positioned in an x, y axis or binary pattern, detects the power level of RF signals to locate the emitter by identifying the intersection with the greatest power level, allowing for passive monitoring of sensitive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional geolocation techniques are used to detect RF signals within structures, then the system can identify emitter positions in open areas, but the signals are blocked, attenuated, or reflected by structural materials making detection unreliable
Solution Approach 1:
The system divides the detection task into multiple segments by deploying numerous linear antennas in a grid pattern throughout the structure. Each antenna independently monitors its local zone, and the system processes measurements from all segments to collectively locate emitters, overcoming the limitation of single-point detection being blocked by structures.
Solution Approach 2:
The linear antennas serve as intermediaries that passively receive and transmit RF signal information between the hidden emitter and the detection system. By distributing many such intermediaries throughout the space, the system ensures that at least some intermediaries can detect signals without being blocked by structural materials.
2Ease of operation
If hand-held RF detectors are used to zero-in on RF signals, then the detector can locate emitters in line-of-sight conditions, but the process requires active searching and emitters may cease operation when detected
Solution Approach 1:
The grid of linear antennas performs self-service by continuously and passively monitoring all areas simultaneously without requiring human operation. The system automatically detects, processes, and locates emitters, eliminating the need for manual searching and ensuring continuous monitoring even when emitters attempt to evade detection.
Solution Approach 2:
The system performs preliminary detection actions by having the antenna grid continuously scan and monitor all areas before any emitter can cease operation. This ongoing preliminary surveillance ensures that emitters are detected and located before they can stop transmitting or move to hidden positions.
3Reliability
If a grid of linear antennas is deployed to continuously monitor areas, then passive detection of emitters is achieved, but the system complexity and number of components increase
Solution Approach 1:
Each linear antenna in the grid is a universal component that performs multiple functions: it acts as both a receiver for detecting RF signals and a spatial reference point for localization. This multi-functionality reduces the need for separate specialized components, thereby managing system complexity while maintaining comprehensive monitoring capability.
Solution Approach 2:
The system merges the detection and localization functions into a unified process. By combining measurements from multiple linear antennas and processing them collectively, the system achieves both continuous monitoring and precise emitter location without requiring separate complex subsystems for each function.
4Measurement precision
If multiple linear antennas measure RF power levels to locate emitters, then accurate positioning is achieved, but the measurement precision requirements increase due to signal variability
Solution Approach 1:
The system uses feedback by continuously comparing power level measurements from all linear antennas and using this information to refine emitter location estimates. The processor analyzes the pattern of power levels across the antenna array and adjusts localization calculations based on the relative signal strengths, compensating for signal variability and improving measurement precision.
Solution Approach 2:
The system transitions from single-point measurement to multi-dimensional measurement by utilizing the spatial arrangement of multiple linear antennas in a grid. By measuring power levels across multiple dimensions (different locations and orientations), the system can triangulate emitter positions more accurately and compensate for signal variability through spatial diversity.
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 uncooperative RF emitters within structures, providing effective detection even under hostile conditions, with the ability to detect multiple emitters and operate independently of frequency, offering improved accuracy and reliability.
Implementation Method 1
A system is provided that detects the location of an uncooperative emitter by measuring the power level in an RF signal using a grid or a plurality of strings of series connected linear antennas
Data Source
AI summary
A system detects the location of an uncooperative emitter by measuring the power level in an RF signal using a grid of linear antennas. The linear antennas are arranged in an x,y axis with intersections strategically placed in areas of interest. A detector detects the power level in each of the leaky signal cables. A processor in communication with the detector identifies the cable intersection having the greatest power level and associates that intersection as the location of the uncooperative emitter.