Vehicle Radar Antenna Layout for Unambiguous Angle Measurement
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Solution Overview
Problem
Conventional radar systems for vehicles face challenges in accurately measuring target angles, particularly in far-field applications, due to ambiguity issues and high complexity, which affects unambiguous track assignment and object differentiation at long ranges, and requires improved azimuthal and elevation measurement capabilities.
Innovation Solution
A radar system with a unique antenna arrangement featuring multiple transmission and reception antennas, where all reception antennas are spaced at different distances to minimize ambiguous range, allowing for improved viewing angle determination through phase information analysis and beamforming techniques, and adaptable configurations for both far and near-field applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional antenna arrangements are used, then the device complexity is reduced, but the measurement precision of target angles deteriorates due to ambiguity issues
Solution Approach 1:
The patent applies asymmetry by arranging reception antennas at non-uniform, different distances from one another in the first direction, rather than using conventional uniform spacing. This asymmetric configuration ensures that each antenna pair has a unique distance combination, eliminating ambiguous angle assignments while maintaining manageable system complexity
Solution Approach 2:
The patent introduces a second direction (elevation direction) in addition to the first direction (azimuth direction), creating a two-dimensional antenna arrangement. This dimensional expansion allows the system to resolve ambiguities in both azimuth and elevation angles simultaneously, improving three-dimensional target localization precision
2Measurement precision
If reception antennas are arranged at different distances, then the measurement precision of viewing angles is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific distance relationships to specific antenna pairs based on their functional requirements. Each reception antenna is positioned at a carefully selected distance from others to optimize the phase difference characteristics for unambiguous angle determination in specific directional ranges
Solution Approach 2:
The patent implements dynamic adaptability by configuring the antenna distances to handle different operational scenarios (near-field vs. far-field applications). The system can dynamically select which antennas to use based on the detected range, optimizing performance for each scenario without requiring physical reconfiguration
3Measurement precision
If all reception antennas are used for far-field detection, then the measurement precision is improved, but the device complexity increases for near-field applications
Solution Approach 1:
The patent applies segmentation by dividing the reception antennas into different groups that can be selectively activated. For far-field detection, all reception antennas are utilized to maximize aperture and angle precision. For near-field detection, only a subset of antennas is activated, simplifying the processing load while maintaining sufficient measurement precision for the closer range
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 configuration enhances the measurement capability by distributing ambiguities over more viewing angles, providing robust and unambiguous angle estimates, and increasing the aperture, resulting in better angle determination and reduced noise interference, while maintaining cost-effectiveness.
Implementation Method 1
at least one or at least or exactly four reception antennas (30), each for acquiring a detection signal (101) for detecting targets (5) in the surroundings of a vehicle, in particular on the basis of the reflected transmission signal (reflections) at these targets
Implementation Method 2
for determining the viewing angle, preferably in order to assign phase information in the (acquired) detection signals to at least one viewing angle for respective detected targets
Data Source
AI summary
A radar system for a vehicle, having at least two transmission antennas, each for emitting a transmission signal into the surroundings of the vehicle, at least four reception antennas, each for acquiring a detection signal for detecting targets in the surrounding of the vehicle, and a processing device for determining the viewing angle, in order to assign phase information in the detection signals to at least one viewing angle for respective detected targets, such that a minimum ambiguous range of the reception antennas in a first direction is specific for the assignment to be ambiguous to more than one viewing angle, wherein all of the reception antennas are spaced apart from each other in the first direction by different distances such that only one of the distances corresponds to the minimum ambiguous range.