Radar Sensor Blockage Detection Through Azimuth Energy Comparison
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Solution Overview
Problem
Existing radar systems struggle to reliably distinguish between radar blockage due to obstructing objects and environments with few reflecting objects, leading to inaccurate detection of sensor blockage.
Innovation Solution
A method involving range-Doppler representation processing of radar signals to determine azimuth angles and calculate relative velocities, followed by comparing energy distributions to detect blockage using similarity measures such as Mahalanobis vector distance, ensuring reliable discrimination between blocked and unblocked sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar signal processing is enhanced to improve blockage detection accuracy, then detection reliability is improved, but processing complexity and computational requirements increase
Solution Approach 1:
The patent segments the energy distribution analysis into multiple azimuth angles, comparing energy distributions across different angular sectors. This segmentation allows the system to detect blockages by identifying abnormal energy patterns in specific directions without requiring complex full-field analysis, thus improving reliability while controlling processing complexity
Solution Approach 2:
The patent replaces complex mechanical or hardware-based blockage detection mechanisms with signal processing and mathematical analysis of radar energy distributions. By using computational methods to analyze energy patterns across different azimuth angles and compare them to reference distributions, the system achieves reliable detection through software-based solutions rather than complex hardware modifications
2Measurement precision
If the radar system processes more data to distinguish blocked from unblocked states, then detection accuracy is improved, but processing time increases
Solution Approach 1:
The patent extracts and compares specific features from the radar signal data - namely the energy distribution patterns at different azimuth angles. By focusing on these extracted features rather than processing the entire raw signal dataset, the system achieves high detection accuracy while minimizing processing time. The method extracts only the necessary energy distribution information needed for blockage detection
Solution Approach 2:
The patent applies partial action by comparing energy distributions at selected azimuth angles rather than analyzing all possible angular positions. This selective approach provides sufficient information to distinguish blocked from unblocked states without the computational overhead of exhaustive analysis, achieving good detection accuracy with reduced processing time
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
Enables fast, efficient, and reliable detection of radar blockage, even in low Doppler resolution scenarios, avoiding unnecessary blockage determinations and improving sensor reliability.
Implementation Method 1
radar transceivers that are arranged for generating radar signals that are transmitted, reflected and received
Implementation Method 2
determining a range-Doppler representation of the radar signal by processing the obtained radar signal such that received radar signal energy is represented as a function of distance and relative velocity
Data Source
AI summary
A method for detecting blockage of a radar sensor (105) by processing a radar signal (115, 116, 117) received by the radar sensor (105). The method includes obtaining (S1) the radar signal (115, 116, 117), determining (S2) a range-Doppler representation (300) of the radar signal such that received radar signal energy (311) is represented as a function of distance (d0-d13) and relative velocity (v0-v7), determining (S4) predetermined azimuth angles (θ1, θ2, θ3) for the radar sensor (105) and calculating (S31) a relative velocity (v0, v3, v5) for each predetermined azimuth angle (θ1, θ2, θ3). The method further includes obtaining (S5) a first distribution (301) and at least one other distribution (302, 303) of received energy (311) over distance in the range-Doppler representation (300) for a first azimuth angle (θ1) and at least one other azimuth angle (θ2, θ3), generating (S7) a measure of similarity for the distributions, and detecting (S8) blockage of the radar sensor (105) if the measure of similarity satisfies a similarity criterion.