Automotive Radar Multi-Target Discrimination via Dual Detection
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Solution Overview
Problem
Automotive radar systems face challenges in discriminating between multiple targets with similar position and Doppler shift reflection characteristics, particularly due to antenna size and technology constraints, leading to difficulties in detecting nearby objects such as pedestrians or motorcycles amidst larger targets like trucks or trailers.
Innovation Solution
A radar system utilizing a plurality of antennas and a controller that determines reflected signal profiles, combines them into a composite data set, and applies a dual detection strategy involving non-coherent integration (NCI) and single receive channel analysis to enhance range, Doppler, and angle resolution, allowing for improved discrimination of nearby targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single composite detection strategy using non-coherent integration (NCI) is used, then detection sensitivity is improved, but the ability to discriminate multiple targets with similar characteristics deteriorates
Solution Approach 1:
The patent segments the detection process into two independent strategies: (1) a composite detection strategy using non-coherent integration (NCI) across multiple receive channels to improve detection sensitivity, and (2) individual receive channel analysis to preserve target discrimination capability. By dividing the detection function into these separate segments operating in parallel, the system achieves both improved sensitivity and maintained discrimination without requiring larger antennas or more complex hardware.
2Measurement precision
If antenna size is increased to improve target discrimination, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical approach of increasing antenna size with a signal processing approach. Instead of physically larger antennas to achieve better target discrimination, the system uses a dual detection strategy that processes signals from existing antennas through two parallel pathways: composite NCI detection and individual channel analysis. This substitution of mechanical enlargement with computational processing maintains discrimination capability while avoiding increased device complexity and cost.
3Measurement precision
If more receive channels are added to improve target discrimination, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent merges the advantages of both composite detection and individual channel detection into a unified dual-strategy system. The composite NCI detection pathway combines signals from multiple receive channels to improve sensitivity, while the individual channel analysis pathway maintains discrimination capability. By merging these two detection approaches and using them in parallel with an 'or logic' comparison, the system achieves improved target discrimination without requiring additional receive channels or increased 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 dual detection approach significantly enhances the radar system's ability to accurately detect and discriminate multiple targets, improving active safety features like near-target discrimination and cross-traffic detection without requiring changes to the radar system design, thereby improving lateral rate estimation and target imaging.
Implementation Method 1
Each antenna is configured to detect a reflected radar signal reflected by an object
Implementation Method 2
two targets that have similar position and Doppler shift reflection characteristics
Data Source
Figure 1
Figure 2
Figure 3
AI summary
ABSTRACT OF THE DISCLOSURE A includes a plurality of antennas (16) and a controller (26). Each antenna is configured to detect a reflected radar signal (20) reflected by an object in a field-of-view (22) of the system (10). The controller (26) is configured to receive an antenna signal from each antenna corresponding to the reflected radar signal (20) detected by the antenna. The controller (26) is also configured to determine a reflected signal profile (32) of each antenna signal. The controller (26) is also configured to determine a composite data set (34) based on a combination of the reflected signal profiles (32). The controller (26) is also configured to determine if the composite data set (34) includes a composite data point characterized as greater than a composite threshold (36). The controller (26) is also configured to determine if any of the reflected signal profiles (32) indicate that the radar signal (18) is reflected by more than one object.