Radar Echo Segmentation for Ghost Peak Resolution in V2X Sensing
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Solution Overview
Problem
Modern mmWave vehicular radars face challenges in extending the maximum detectable range and velocity due to the use of communication signals with short-duration pulses, leading to ghost peaks and ambiguity in radar sensing, which are not adequately addressed by existing methods.
Innovation Solution
A dual-segmentation method combined with the Chinese Remainder Theorem (CRT) is employed to process communication echoes, using different segment lengths for the received and clean transmit signals to detect and resolve ghost peaks, reducing complexity to O((N log KN)²P₀) while increasing the maximum detectable range and velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If short-duration communication pulses are used for radar sensing, then the data rate is improved, but the maximum detectable range and velocity are reduced due to range folding and ghost peaks
Solution Approach 1:
The patent divides the received communication signal and reference signal into multiple segments with different segment lengths. By processing these segmented signals through ambiguity function evaluation, the system resolves ghost peaks and extends the maximum detectable range and velocity while maintaining the use of short-duration communication pulses for high data rate transmission.
2Length of stationary object
If the transmit pulse duration is increased to extend maximum detectable range, then the maximum detectable velocity decreases due to the inverse relationship between range and velocity detection
Solution Approach 1:
The patent segments the transmit pulse into multiple portions with different segment lengths. This segmentation allows the system to simultaneously achieve extended maximum detectable range through longer effective segment processing while maintaining high maximum detectable velocity through shorter segment processing, resolving the inverse relationship constraint.
Solution Approach 2:
The patent introduces an additional processing dimension by evaluating ambiguity functions with multiple different segment lengths. This multi-dimensional approach allows the system to independently optimize for both range and velocity detection capabilities without being constrained by the traditional inverse relationship.
3Measurement precision
If dual-segmentation with different segment lengths is employed to resolve ghost peaks, then the maximum detectable range and velocity are extended, but the processing complexity increases
Solution Approach 1:
The patent divides the signal processing into multiple segments with different lengths, where each segment is processed independently through ambiguity function evaluation. This segmentation approach manages computational complexity by breaking down the overall processing task into smaller, more manageable sub-tasks that can be executed efficiently.
Solution Approach 2:
The patent processes only the necessary portions of the signal with different segment lengths rather than processing the entire signal uniformly. This partial action approach reduces overall processing complexity while still achieving the goal of resolving ghost peaks and extending detection capabilities.
Data Source
AI summary
A method of processing communication signals for use in radar sensing includes segmenting copies of a reference signal and a received echo thereof into first- and second-length segments, respectively. The first- and second-length segments are arranged in respective first and second reference and echo matrices. First and second segmented ambiguity functions based on the first and second matrix pairs are evaluated. For obtaining first and second range estimates and first and second velocity estimates for one or more targets. Any ghost signal detected is resolved, or an ambiguity order is assigned thereto if resolving is not possible. The obtained or resolved range and velocity estimates, or the estimates and the assigned ambiguity order is output, and the evaluation process is iteratively repeated until a termination criterion is met. In the second and each further iteration a respective remaining right-most non-zero columns of the echo matrices are replaced with zero-columns.