Guard Band Antenna for Beam-Steering Radar Angle Refinement
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Solution Overview
Problem
Existing radar systems face limitations in angular resolution due to beam width, making it difficult to distinguish multiple objects at the same range and velocity, which is critical for autonomous driving applications.
Innovation Solution
Implementing a guard band antenna with a beam steering radar system that generates narrow, directed beams and uses advanced signal processing and machine learning to enhance angular resolution by employing guard band antennas to resolve multiple objects within a main beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a beam steering radar system uses a standard beam width for object detection, then the detection coverage is sufficient, but the angular resolution is limited making it difficult to distinguish multiple objects at the same range and velocity
Solution Approach 1:
The patent divides the detection task into two stages: first using a main beam antenna for general object detection, then using a guard band antenna with narrower beam width to resolve multiple objects within the main beam. This segmentation allows the system to maintain broad coverage while achieving high angular resolution when needed, without requiring the main beam to be continuously narrow.
Solution Approach 2:
The guard band antenna acts as an intermediary component that mediates between the main beam antenna and the signal processing system. It provides additional angular resolution information for objects detected in the main beam, enabling the system to distinguish multiple targets without fundamentally changing the main beam configuration.
2Measurement precision
If the beam width is narrowed to improve angular resolution, then multiple objects can be distinguished better, but the detection time increases and productivity decreases
Solution Approach 1:
The detection process is segmented into a fast initial scan using the main beam antenna, followed by selective refinement using the guard band antenna only for regions where multiple objects are suspected. This avoids the need to continuously use the narrower beam, maintaining high detection speed while achieving high resolution when necessary.
Solution Approach 2:
The system applies the narrower guard band beam only partially - specifically to angular regions where object separation is needed - rather than using it for all detections. This partial application of the high-resolution beam maintains overall detection productivity while achieving the necessary angular resolution for ambiguous cases.
3Measurement precision
If a guard band antenna is added to the radar system, then angular resolution is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The guard band antenna serves as a specialized intermediary component that can be integrated into the existing radar system architecture. By positioning it adjacent to the main beam antenna and using it only for angular resolution refinement, the system achieves improved measurement precision without requiring a complete redesign of the manufacturing process.
Solution Approach 2:
The guard band antenna is designed to work in conjunction with the existing main beam antenna and signal processing system, serving multiple functions: it provides angular resolution refinement, maintains compatibility with existing hardware, and can be integrated into the current beam steering mechanism without requiring entirely new manufacturing processes.
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 system effectively improves the radar's ability to distinguish and accurately identify multiple objects, providing enhanced object detection capabilities in various weather conditions and environments, supporting autonomous driving functions.
Implementation Method 1
Frequency Modulation Continuous Waveform (FMCW) techniques to capture range and velocity directly from the received signals
Implementation Method 2
The beams are generated and steered in the analog domain
Data Source
AI summary
Examples disclosed herein relate to a beam steering vehicle radar for object identification. The beam steering vehicle radar includes a beam steering receive antenna having a plurality of antenna elements to generate a radiation beam comprising a main lobe and a plurality of side lobes, at least one guard band antenna to generate a guard band radiation beam, and a perception module coupled to the beam steering receive antenna to detect and identify a first object reflection in the radiation beam. The perception module has a monopulse module to determine a range and angle of arrival for the first object reflection and detect multiple objects upon determining an absence of a second object reflection in the guard band radiation beam.