Phased Array AoA Measurement Using Dual-Angle Power Sampling
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Solution Overview
Problem
In modern telecommunication systems with high-frequency carriers, the challenge of accurately measuring the angle of arrival (AoA) is exacerbated by increased path loss and narrow beam widths, leading to potential missed connections due to beam misalignment, especially in moving devices, despite existing algorithms like the extended Kalman filter not fully addressing precision issues.
Innovation Solution
A method for measuring AoA using a steerable phased array that involves receiving signals at two different steering angles, obtaining power-related information at each angle, and calculating AoA based on these measurements, with the angle difference being less than the half-power beam width, employing parabolic approximation to simplify calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the directivity of the antenna is increased to compensate for path loss, then the signal reception quality is improved, but the beam width decreases making it easier to miss the receiver when in motion
Solution Approach 1:
The patent implements dynamic beam tracking by continuously measuring the angle of arrival (AoA) of the signal and adjusting the beam direction in real-time. The system uses a steerable phased array that can dynamically change its beam steering angle to follow the moving receiver, transforming the static high-directivity beam into a dynamic tracking system that maintains alignment despite motion.
Solution Approach 2:
The patent employs feedback through AoA measurement and beam tracking algorithms that use the measured angle information to adjust the beam direction. The system continuously measures the AoA using the steerable phased array and feeds this information back to update the beam steering, creating a closed-loop control system that maintains optimal signal reception.
2Ease of operation
If conventional beam tracking algorithms like extended Kalman filter are used, then some tracking capability is achieved, but the accuracy and precision of AoA measurements are insufficient
Solution Approach 1:
The patent replaces conventional algorithm-based tracking (extended Kalman filter) with a physics-based geometric approach using parabolic approximation. Instead of relying on iterative numerical optimization, the system uses the geometric relationship between the steerable array, the measured power at different steering angles, and the parabolic shape of the beam pattern to directly calculate AoA, providing higher precision and faster convergence.
Solution Approach 2:
The patent changes the measurement parameters by using power-related information (PRI) at two different steering angles within a specific angular range (less than FNBW/2). By carefully selecting the steering angles and using the ratio of power measurements, the system transforms the AoA measurement problem into a solvable geometric calculation based on parabolic approximation, improving both accuracy and computational efficiency.
3Speed
If the frequency of the carrier is increased to allow broader signal bandwidth, then the signal bandwidth is improved, but the wavelength decreases causing worse attenuation and path loss
Solution Approach 1:
The patent uses dynamic beam steering and tracking to compensate for the increased path loss at higher frequencies. By continuously adjusting the beam direction to maintain optimal alignment with the receiver, the system maximizes the received signal strength despite the higher attenuation, enabling effective communication over broader bandwidths at high frequencies.
Data Source
AI summary
The disclosure is directed to a method for measuring an angle of arrival (AoA), with a steerable phased array. The method would include but not limited to: receiving a signal by the steerable phased array with a first steering angle and with a second steering angle; obtaining a first power-related information (PRI1) of the signal corresponding to the first steering angle; obtaining a second power-related information (PRI2) of the signal corresponding to the second steering angle; and calculating an AoA of the signal based on the first power-related information and the second power-related information, wherein the first steering angle is different from the second steering angle, and an absolute difference between the first steering angle and the second steering angle is less than FNBW/2.