Radar Reception Antenna Azimuth Aliasing
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Solution Overview
Problem
Conventional radar devices face erroneous detection due to azimuth aliasing, which requires arranging multiple reception antennas at unequal intervals, increasing the overall area occupied by the antennas.
Innovation Solution
A radar device with a reception antenna configuration that includes multiple first reception antenna elements along a direction and a second reception antenna element disposed at an angle from at least two of the first elements, with varying distances between centers, allowing the control unit to calculate object angles using signals from these elements, thereby minimizing the area occupied while preventing azimuth aliasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three or more reception antennas are arranged at unequal intervals in a straight line to eliminate ghost information caused by azimuth aliasing, then measurement precision is improved, but area of stationary object increases
Solution Approach 1:
The invention transitions from a one-dimensional straight line arrangement of antennas to a two-dimensional planar configuration. By arranging antennas in a triangle pattern with specific interval relationships rather than in a straight line, the system eliminates azimuth aliasing while occupying less overall area. The triangular geometry provides the necessary spatial diversity for accurate azimuth detection without requiring the extended linear arrangement that would consume more space.
2Reliability
If multiple reception antennas are arranged at unequal intervals to prevent erroneous detection, then reliability is improved, but device complexity increases
Solution Approach 1:
The invention employs asymmetric interval relationships between antennas in a triangular arrangement. Specifically, the intervals between adjacent antennas are designed with specific ratios (e.g., one interval being approximately twice another) rather than using symmetric or equally spaced arrangements. This asymmetric configuration effectively prevents azimuth aliasing and erroneous detection while maintaining a relatively simple three-antenna structure, thus improving reliability without excessively increasing device complexity.
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
The solution effectively prevents erroneous detections from azimuth aliasing while reducing the overall area required for the reception antennas, enhancing the radar device's performance and efficiency.
Implementation Method 1
a reception antenna (102) that receives reflected waves from an object reflecting the electromagnetic waves
Data Source
AI summary
The present invention minimizes the overall area occupied by a reception antenna while preventing erroneous detections resulting from azimuth aliasing. A reception antenna includes antenna elements that are disposed along the horizontal direction, antenna elements that are disposed along the vertical direction, and an antenna element that is disposed at an angle from the antenna elements with respect to the horizontal direction and is disposed at an angle from the antenna elements with respect to the vertical direction. The distance between the centers of the antenna elements in the horizontal direction differs from the distances between the center of the antenna element and the respective centers of the antenna elements in the horizontal direction. The distance between the centers of the antenna elements in the vertical direction differs from the distances between the center of the antenna element and the respective centers of the antenna elements in the vertical direction.