Parallel CFAR Subdetectors for Radar Target Detection
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Solution Overview
Problem
Existing radar systems face suboptimal detection performance due to the use of single-point cell Constant False Alarm Rate (CFAR) detectors, which result in either low detection rates with high false alarms or high detection rates with missed targets, as they struggle to differentiate between various types of radar targets such as vehicles, pedestrians, and stationary objects.
Innovation Solution
The implementation of a radar circuit with multiple parallel Constant False Alarm Rate (CFAR) subdetectors, each optimized for specific target types, using different cell arrays under test, and an electronic control unit (ECU) to merge detection events and execute control actions, enhancing detection accuracy by employing target-specific detection parameters and object-level processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-point cell CFAR detector is used, then the device complexity is reduced, but the detection precision and reliability deteriorate due to inability to differentiate between various target types
Solution Approach 1:
The patent divides the detection function into multiple parallel CFAR subdetectors, each specialized for specific target types (e.g., vehicle detector, pedestrian detector, stationary object detector). This segmentation allows each subdetector to optimize its parameters for its target type, improving overall detection precision while maintaining manageable complexity through modular architecture
Solution Approach 2:
Each CFAR subdetector is configured with local quality optimizations tailored to specific target types, including different numbers of cells under test, different reference cell configurations, and different threshold settings. This allows each detector to have the optimal detection characteristics for its intended target type rather than using a uniform approach
2Productivity
If a single-point cell CFAR detector with high detection threshold is used, then the detection rate of targets is improved, but the false alarm rate increases
Solution Approach 1:
By segmenting the detection function into multiple specialized subdetectors, each can operate at optimal thresholds for its target type without generating excessive false alarms from unrelated targets. For example, the vehicle detector can use higher thresholds appropriate for vehicle-sized targets without triggering false alarms from smaller objects like pedestrians or stationary objects
Solution Approach 2:
The patent changes detection parameters (number of cells under test, reference cell counts, threshold levels) for each CFAR subdetector based on the specific characteristics of the target type it detects. This parameter optimization allows each subdetector to achieve high detection rates while maintaining appropriate false alarm rates for its specific target class
Data Source
AI summary
A radar circuit for use with a host system such as a vehicle includes a radio frequency (RF) signal generator configured to generate a predetermined RF waveform, an RF antenna connected to the RF signal generator, and an ECU which executes a method. As part of such a method, a signal generator transmits the RF waveform toward different radar target types, and receives return signatures reflected therefrom. The ECU receives the return signatures from the antenna, processes the return signatures via parallel constant false-alarm rate (CFAR) subdetectors each with defined cells under test to detect the target types as a set of detection events, merges the detection events into a merged set, and executes a control action aboard the host system responsive to the merged set. Each subdetector detects a corresponding one or more of the radar target types via corresponding detection parameters.