Direction Finding Using Networked Antenna Array
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Solution Overview
Problem
Current direction finding methods are limited by their inability to accurately utilize both phase and amplitude difference data, leading to reduced accuracy and reliability, especially in unclean environments, and often require multiple scans to cover wide directional sectors, which slows the process.
Innovation Solution
A method and system using a phased antenna array network that collects and processes both phase and amplitude difference data through signal combining components, applying correlative interferometry to determine the direction of origin, and calibrates for multiple polarizations to account for environmental interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If current direction finding methods detect and measure only phase or only amplitude of a signal, then the system complexity is reduced, but the accuracy and reliability of the results deteriorate due to signal polarization corruption
Solution Approach 1:
The patent combines both phase difference data and amplitude difference data from multiple antennas into a unified direction finding process. The signal combining components merge the complex voltage signals from each antenna, allowing simultaneous utilization of both phase and amplitude information to determine signal direction, thereby improving accuracy and reliability without excessive complexity increase
Solution Approach 2:
The patent changes the measurement parameters by simultaneously measuring both phase and amplitude of the received signals, rather than selecting only one parameter. This dual-parameter approach provides redundant information that compensates for polarization effects and environmental corruptions, improving measurement precision
2Adaptability or versatility
If beam forming is used to scan a wide range of directions, then the directional coverage is improved, but the time required to complete the scanning process increases due to multiple sequential scans
Solution Approach 1:
The patent performs preliminary calibration by storing complex voltage signal data from all antenna combinations in a database before actual direction finding operations. This pre-computed database of signal characteristics allows the system to quickly determine signal direction through correlation without requiring time-consuming sequential beam forming scans, thus reducing scanning time while maintaining wide directional coverage
Solution Approach 2:
The patent implements a dynamic correlation process that can instantly analyze signals from any direction by comparing real-time antenna signals against the pre-stored database. This dynamic approach eliminates the need for sequential mechanical or electronic beam steering, enabling instantaneous 360-degree scanning capability
3Device complexity
If amplitude data is compared to pre-established charts for direction finding, then the processing complexity is reduced, but the accuracy deteriorates due to environmental corruption and intentional interference
Solution Approach 1:
The patent creates a composite data structure that combines complex voltage signals from multiple antenna pairs, incorporating both amplitude and phase information. This composite signal representation is more resistant to environmental corruption and intentional interference compared to simple amplitude data, as the combined information provides multiple independent measurements that can identify and reject corrupted data
Solution Approach 2:
The patent implements a correlation-based feedback mechanism where the received signal data is continuously compared against a pre-stored database of known signal patterns. This feedback process iteratively refines the direction estimation by identifying the best match between observed and expected signals, thereby improving accuracy in corrupted environments
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 provides highly accurate direction finding capabilities in corrupted environments, enabling instantaneous 360-degree scanning and improving the accuracy and speed of direction determination.
Implementation Method 1
collecting phase difference data from the detected signal
Implementation Method 2
collecting amplitude difference data from the detected signal
Implementation Method 3
a phased antenna array network that collects and processes both phase and amplitude difference data
Implementation Method 4
applying a correlative interferometry direction finding process to the processed data
Data Source
AI summary
A system and method that can determine the direction of origin within 360 degrees around an antenna array for an emitted signal with a high degree of accuracy, even when the array is installed in a corrupted or “unclean” environment. Further, the provided system and method can provide a more accurate indication of direction despite polarization of the detected signal. Finally, the provided system and method can provide accurate results from phase measurements, amplitude measurements, or both phase and amplitude measurements, from an emitted signal where a phase network can be used to tailor the amplitude and phase variations versus spatial angle to best match the receiver measurement accuracies.