Binary AoA Array Coding for Low-Complexity Angle Detection
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Solution Overview
Problem
Existing antenna arrays for signal detection and angle of arrival estimation are complex, costly, and require high precision calibration, making them unsuitable for applications needing lower complexity and lower Cost, Size, Weight, and Power (C-SWAP) requirements.
Innovation Solution
The use of binary phase detecting element pairs in an array antenna system, where each pair consists of two receive elements with a phase difference that depends on the angle of arrival, generating a unique digital code word for signal detection and error correction, allowing for simpler operation and lower C-SWAP implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional antenna arrays are used for signal detection and angle of arrival estimation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional analog phase detection and signal combining mechanisms with a digital binary encoding system. Each sensor element pair uses a binary phase detector that outputs discrete 0 or 1 values based on phase differences, substituting continuous analog processing with digital binary representation. This fundamentally changes the system from mechanical/analog signal processing to digital binary code processing, reducing hardware complexity while maintaining angle of arrival estimation capability
Solution Approach 2:
The patent changes the output parameter of each sensor element from continuous phase values to discrete binary values (0 or 1). By introducing binary phase detectors that convert continuous phase differences into binary code bits, the system transforms the parameter space from continuous to discrete domains. This parameter change enables error correction coding and simplifies the decoding process, resolving the contradiction between precision and complexity
2Measurement precision
If traditional antenna arrays are used for signal detection and angle of arrival estimation, then measurement precision is improved, but cost, size, weight, and power requirements increase
Solution Approach 1:
The patent replaces power-intensive analog signal processing chains with low-power digital binary processing. Each sensor element uses a binary phase detector instead of full analog phase measurement circuits, significantly reducing the power required per sensor element. The digital binary output eliminates the need for complex analog-to-digital conversion and signal combining hardware, further reducing overall power consumption while maintaining measurement precision
Solution Approach 2:
The patent employs simple binary phase detectors at each sensor element that can be implemented with minimal hardware, effectively treating each detection element as a low-cost, low-power unit. The binary output requirement allows for simplified circuit design that consumes minimal power, making the system scalable without proportionally increasing power requirements
3Reliability
If traditional antenna arrays are used for signal detection and angle of arrival estimation, then reliability is improved, but ease of manufacture decreases
Solution Approach 1:
The patent replaces precision-critical analog hardware assemblies with digital binary processing elements that are easier to manufacture. Binary phase detectors can be implemented with simpler circuits than traditional analog phase measurement systems, and the digital binary output format simplifies subsequent processing and error correction. This substitution makes the array elements more standardized and easier to manufacture with consistent performance
Solution Approach 2:
The patent incorporates error correction coding in the binary code word structure, providing beforehand protection against detection errors. By designing the binary encoding scheme with inherent error correction capability, the system anticipates and compensates for potential manufacturing variations and environmental interference, ensuring reliable operation even with simpler manufacturing processes
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 efficient detection of signal presence and determination of angle of arrival with error correction capabilities, even in noisy conditions, and allows for flexible array configurations, reducing complexity and resource requirements.
Implementation Method 1
a plurality of wave sensors for transducing the incident waves into an electrical signal
Implementation Method 2
each phase detector coupled to two such electrical terminals for digitally outputting either a one or a zero according to a relative phase of electrical signals present at the two terminals
Data Source
AI summary
A system and method for detecting an angle of arrival (AoA) of incident waves are disclosed. An array of wave sensors each transduce incident waves into an electrical signal, which is then provided an additional phase shift that varies between sensors. Electrical signals from adjacent wave sensors, having different phase shifts, are coupled via a phase detector to classify the incident waves into “zero” and “one” AoA regions for that sensor pair. The outputs from many such phase detectors are combined to divide the space facing the array into many subregions, each subregion being associated with a unique codeword. Incident waves cause detection of codewords, that are decoded according to error detection and correction techniques, such as selecting, from a list, the codeword having a minimum Hamming distance to a received codeword. The decoder then outputs data indicating an AoA subregion associated with the decoded codeword.