Phase Event Detection for Direction of Arrival Estimation
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Solution Overview
Problem
Existing systems face limitations in providing flexible, low-cost, and lightweight directional reception of low-frequency, long-wavelength signals due to the size constraints of transducers, which are inherently limited by the wavelength of the waves they receive, leading to poor directionality and high bandwidth requirements.
Innovation Solution
A system comprising at least two detector devices that independently detect phase events of composite traveling wave signals, using a processor to estimate the direction of arrival based on phase event information, and employing a transducer with a bandpass filter and phase event detector to filter and process the signals, allowing for directional reception without the need for wide bandwidth transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of the antenna structure is increased to achieve better directionality for low-frequency signals, then the directionality improves, but the system becomes more complex and heavier
Solution Approach 1:
The system divides the directionality function across multiple distributed sensors instead of requiring a single large antenna structure. Each sensor detects local phase events, and the array of sensors collectively provides directional information through spatial analysis of phase differences.
Solution Approach 2:
The patent replaces the mechanical approach of using large physical antenna structures with a computational approach. Instead of relying on the physical size of the antenna to achieve directionality, the system uses signal processing algorithms that analyze phase event information to determine direction of arrival.
2Measurement precision
If the bandwidth is increased to transmit directional information accurately, then the information quality improves, but the transmission requirements become more demanding
Solution Approach 1:
The system extracts only the essential phase event information from the full wave signal rather than transmitting the complete wave. By detecting and transmitting only the phase event timestamps and positions, the system reduces the data requirements while maintaining the information needed for accurate directionality estimation.
Solution Approach 2:
The sensors perform preliminary processing by detecting and filtering phase events locally before transmission. This preliminary action of identifying and isolating phase event information reduces the bandwidth requirements for subsequent transmission to the central processing site.
3Measurement precision
If multiple sensors are deployed to improve directionality, then the measurement capability improves, but the system complexity and deployment cost increase
Solution Approach 1:
Each sensor in the array performs multiple functions: it detects phase events, determines local position, and contributes to directional analysis. The sensors are designed to be identical and interchangeable, with each unit performing the same detection function that can be applied across the entire array to achieve directionality through collective operation.
Data Source
AI summary
In one embodiment, a system includes at least two detector devices, each detector device for independently detecting a phase event of a composite signal comprising one or more traveling wave signals to provide phase event information. The system further includes a processor configured to receive the phase event information from each detector device and to estimate a direction of arrival of at least one of the traveling wave signals based on the phase event information.