Multi-Frequency Angle Measurement for Wide-Range Antenna Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing DOA estimation methods for large-diameter antenna arrays face a trade-off between angle measurement range and resolution, where increasing the diameter for a larger range reduces resolution, and vice versa, necessitating a solution that can expand the measurement range while maintaining resolution.
Innovation Solution
A method involving selecting N target frequencies from a candidate set, ensuring the least common multiple of their angle measurement ranges exceeds a preset threshold, allowing for expanded range without requiring smaller antenna spacings, thus reducing mutual coupling and conserving frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the antenna array diameter is increased to expand the angle measurement range, then the angle measurement range is improved, but the angle measurement resolution deteriorates
Solution Approach 1:
The patent segments the wideband signal into multiple narrowband sub-signals through frequency domain division. Each sub-signal operates at a different frequency, allowing the system to process multiple frequency components separately and fuse their results, thereby achieving both large measurement range and high resolution without requiring a physically large antenna array
Solution Approach 2:
The patent transitions from a single-dimensional spatial measurement approach to a multi-dimensional approach by incorporating frequency dimension. By utilizing multiple frequencies (N target frequencies from M candidate frequencies), the system creates a frequency-spaced array effect that expands the effective aperture without increasing physical antenna spacing, thus resolving the contradiction between range and resolution
2Measurement precision
If the antenna element spacing is reduced to improve angle measurement resolution, then the angle measurement resolution is improved, but the angle measurement range is reduced
Solution Approach 1:
The patent changes the frequency parameter of the operating signal from a single frequency to multiple target frequencies. By selecting N frequencies from M candidate frequencies according to specific criteria (where the least common multiple of their angle measurement ranges exceeds a preset threshold), the system achieves enhanced resolution without reducing antenna spacing, thereby maintaining a large angle measurement range
3Measurement precision
If frequency resources are increased to improve angle measurement performance, then the angle measurement range and resolution are improved, but the frequency resource consumption increases
Solution Approach 1:
The patent applies partial action by selecting only N target frequencies from the available M candidate frequencies, rather than utilizing all candidate frequencies. This selective approach achieves the required angle measurement performance (with the least common multiple of angle measurement ranges exceeding the preset threshold) while consuming fewer frequency resources, thus optimizing the trade-off between performance and resource usage
Data Source
AI summary
An example method includes: A first communication apparatus and a second communication apparatus determine N target frequencies. The first communication apparatus sends a sensing signal to the second communication apparatus on the N target frequencies. The second communication apparatus performs angle measurement based on the sensing signal. The N target frequencies belong to a candidate frequency set that includes M candidate frequencies, 1<N<M, and a least common multiple of processed angle measurement ranges corresponding to the N target frequencies is greater than a preset angle measurement range, or the least common multiple of the processed angle measurement ranges corresponding to the N target frequencies is greater than or equal to a least common multiple of processed angle measurement ranges corresponding to any N candidate frequencies in the candidate frequency set.