Antenna Device Azimuth Detection Grating Ghost Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing azimuth detecting devices face challenges in maintaining angle performance while preventing erroneous target detection due to grating ghosts, especially when trying to detect targets in a wider angular range at short distances or at longer distances with increased antenna intervals.
Innovation Solution
The antenna device is configured with multiple antenna groups, each comprising unit antennas arranged at two or more different intervals, allowing for effective detection of target azimuths over a wider angle range while reducing erroneous detections caused by grating ghosts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the arrangement intervals between receiving antennas are narrowed to detect targets in a wider angular range at short distances, then the angular detection range is improved, but the angle performance (accuracy and resolution) deteriorates
Solution Approach 1:
The receiving antenna array is segmented into multiple sub-arrays (first sub-array and second sub-array) with different interval characteristics. The signal processing unit processes signals from each sub-array separately and combines the results, allowing the system to achieve both wide angular coverage and high angle precision simultaneously by leveraging the complementary strengths of each sub-array configuration.
Solution Approach 2:
Different regions of the antenna array are assigned different interval characteristics - the first sub-array uses narrower intervals optimized for wide-angle detection, while the second sub-array uses wider intervals optimized for precise angle measurement. This local differentiation allows each region to perform its specialized function while contributing to the overall system performance.
2Measurement precision
If the arrangement intervals between receiving antennas are widened to improve angle performance, then the angle performance is improved, but grating ghosts increase causing erroneous target detection
Solution Approach 1:
The signal processing unit acts as an intermediary that processes signals from antennas with wide intervals. By applying specific signal processing techniques to the received signals before combining them with signals from the narrow-interval sub-array, the system suppresses grating ghost artifacts while preserving the high angle precision benefits of the wide-interval configuration.
Solution Approach 2:
The system merges the output signals from the first sub-array (narrow intervals) and second sub-array (wide intervals) through coherent signal processing. This combination allows the wide-interval sub-array to provide high angle precision while the narrow-interval sub-array suppresses grating ghosts, achieving both goals simultaneously in the final detection result.
3Measurement precision
If the number of channels in the azimuth detecting device is increased to maintain angle performance with narrowed antenna intervals, then the angle performance is maintained, but the device complexity increases
Solution Approach 1:
The antenna array is segmented into multiple sub-arrays that can be processed independently. By dividing the total number of antennas into smaller groups with different interval characteristics, the system maintains angle performance through the wide-interval sub-array while the narrow-interval sub-array provides wide coverage, avoiding the need to increase the total channel count.
Solution Approach 2:
Each sub-array serves multiple functions: the first sub-array provides wide angular coverage and suppresses grating ghosts, while the second sub-array provides high angle precision. The signal processing unit processes both sub-arrays using similar techniques, making the system multi-functional without requiring proportionally more channels.
Data Source
AI summary
An antenna device for receiving radio wave signals includes antenna groups. Each of the antenna groups includes unit antennas arranged in a predetermined direction. The antenna groups are arranged in the predetermined direction at equal intervals. The unit antennas in each of the antenna groups are arranged at two or more different intervals in the predetermined direction in the antenna device.