Antenna Array Geolocation Using Inter-Element Phase Differences
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Solution Overview
Problem
Current geolocation methods for signal sources require multiple signal observations and complex computations, especially when antenna elements are spaced farther apart than half a wavelength, leading to physical constraints and inefficiencies in platforms like aircraft.
Innovation Solution
A geolocation system and method that utilize inter-element phase difference measurements between antenna elements spaced greater than half a wavelength, allowing for simultaneous signal acquisition and geolocation by measuring phase changes over time, enabling accurate direction finding and line of bearing determination without the need for close element spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antenna elements are spaced farther apart than half a wavelength, then physical constraints are overcome and flexibility in placement is improved, but measurement precision and geolocation accuracy deteriorate
Solution Approach 1:
The patent employs dynamic measurement of phase differences over time rather than static single-point measurements. By continuously monitoring phase changes as the platform moves, the system can resolve ambiguities that arise from large element spacing, maintaining geolocation accuracy while allowing flexible antenna placement.
Solution Approach 2:
The system performs preliminary measurements of phase differences at multiple time points before final geolocation calculation. This preliminary data collection enables the system to resolve ambiguities and establish accurate direction-of-arrival information even when antenna elements are spaced farther apart than traditional half-wavelength constraints.
2Measurement precision
If multiple signal observations are required for geolocation, then measurement precision is improved, but loss of time and computational complexity increase
Solution Approach 1:
The patent implements continuous monitoring of phase differences as the platform moves, rather than discrete separate observations. This continuous action allows the system to extract multiple measurement cycles from a single ongoing signal acquisition process, reducing total time while maintaining the precision benefits of multiple measurements.
Solution Approach 2:
The system performs preliminary phase difference measurements continuously during signal acquisition, preparing multiple measurement cycles in advance. This preliminary action enables the geolocation calculation to be performed more efficiently without requiring separate dedicated observation periods, thereby reducing overall time loss.
3Ease of manufacture
If antenna elements are spaced farther apart, then ease of manufacture and platform design are improved, but device complexity in signal processing increases
Solution Approach 1:
The patent replaces complex mechanical positioning systems with electronic phase difference measurement. Instead of mechanically constraining antenna elements to precise half-wavelength spacing, the system uses electronic detection of phase changes over time to achieve the same geolocation accuracy, thereby simplifying manufacturing and installation while managing processing complexity through algorithmic approaches.
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 geolocation of signal sources with greater flexibility in antenna element placement, overcoming physical constraints and reducing computational complexity, allowing for efficient signal source localization even at greater distances between elements.
Implementation Method 1
measuring inter-element phase differences in the signal at a first time; measuring inter-element phase differences in the signal at subsequent times
Implementation Method 2
geolocating the signal source based on phase interferometry
Data Source
AI summary
An antenna receiver has antenna elements that are arranged in an array and spaced apart from each other at a distance greater than one-half wavelength of the highest operating frequency of a signal that is to be detected by the antenna receiver. The antenna receiver has geolocation logic that uses the inter-element phase difference measurements to obtain a location of the signal source. The change in the inter-element phase differences enables the elements to be spaced apart at great distances, which is beneficial for the physical construction of the platform, as the elements may be easily placed at convenient locations for conformal aerodynamic properties.