Radar Signal Analysis Using Multiple Beam Formations
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Solution Overview
Problem
Radar systems using Uniform Linear Arrays (ULA) experience varying gain over the angular range of the positioning field, resulting in significant dips that affect the accuracy of angular resolution and sensitivity, particularly in automotive and automated driving applications.
Innovation Solution
The use of multiple antenna arrays with different beam formations applied to each radar signal, where one beam formation's maxima compensate for the other's minima, achieving a more homogeneous gain profile across the angular range by shifting and superimposing beam formations using complex window functions and Fast Fourier Transforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single beam formation is applied to radar signals from a Uniform Linear Array, then computational outlay is reduced and processing is simplified, but significant dips in gain occur over the angular range of the positioning field
Solution Approach 1:
The invention divides the single beam formation into multiple beam formations (first beam formation and second beam formation), each processing signals from the same antenna array but with different beamforming weights. This segmentation allows the system to address gain dips by combining multiple beam formations, thereby improving gain uniformity while keeping individual processing tasks manageable
Solution Approach 2:
The invention merges the results of multiple beam formations (first beam formation and second beam formation) through signal combining. By superimposing the beamformed signals with complementary gain characteristics, the system achieves a more homogeneous overall gain profile across the angular range, compensating for the dips that would occur with a single beam formation
2Reliability
If multiple beam formations are applied to radar signals, then gain uniformity over the angular range is improved, but computational outlay increases
Solution Approach 1:
The invention applies different beamforming characteristics locally to different signal components. The first beam formation is optimized for certain angular ranges while the second beam formation compensates for specific dip regions. This local optimization approach allows targeted improvement of gain uniformity without requiring complete reprocessing of all signals with equally complex algorithms
Solution Approach 2:
Rather than applying a single overly complex beam formation algorithm that would guarantee perfect gain uniformity, the invention uses multiple simpler beam formations that collectively achieve the desired result. Each beam formation performs a partial function, and their combination provides the complete solution, thereby reducing individual computational burdens while maintaining overall performance
Data Source
AI summary
An analysis of radar signals, in particular of radar signals, which are received by a plurality of ULA antennas. By applying different beam formations to the radar signals of the individual ULA antennas, beamforming is used to compensate for dips in the gain.