FMCW Radar Waveform Selection for Multi-Radar Coexistence
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Solution Overview
Problem
Radar systems in vehicles experience significant interference from nearby transmissions, degrading target detection performance due to indistinguishable multiple radar sources, particularly in automotive radar systems used for advanced driver assistance systems (ADAS) and automated driving.
Innovation Solution
Each radar system selects waveform parameters, such as chirp slopes and frequency offsets, to reduce interference by varying these parameters for transmitted signals, improving multi-radar coexistence and enhancing target detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple radar systems transmit using standard waveforms, then radar detection coverage is maintained, but interference between radars degrades target detection performance
Solution Approach 1:
The patent applies parameter changes by varying waveform characteristics (frequency offsets, chirp slopes, phase codes) across different radar transmitters. Each radar system modifies its transmission parameters dynamically or semi-statically to create distinguishable waveforms, thereby reducing mutual interference while maintaining detection reliability. This is implemented through coordinated parameter selection among co-channel radars.
2Object-affected harmful factors
If radar waveform parameters are varied to reduce interference, then multi-radar coexistence improves, but waveform parameter selection complexity increases
Solution Approach 1:
The patent implements dynamics by enabling radar systems to adaptively adjust waveform parameters based on the operational environment and detected interference conditions. Rather than using fixed parameters, the system dynamically selects and varies parameters such as frequency offsets and phase codes to optimize coexistence performance while managing complexity through structured adaptation rules.
3Device complexity
If standard FMCW waveforms are used for simplicity, then device complexity is reduced, but ability to distinguish multiple radar sources is lost
Solution Approach 1:
The patent applies segmentation by dividing the waveform parameter space into distinct, identifiable segments. Each radar system is assigned or selects a unique combination of parameters (frequency offset, chirp slope, phase code) that segments the overall signal environment into distinguishable components. This allows receivers to identify and separate signals from different radar sources while maintaining relatively simple waveform structures.
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 method improves radar coexistence by reducing interference, allowing for more accurate target detection and reliable operation of automotive radar systems in the presence of multiple radar sources.
Implementation Method 1
Radar systems are used for target detection by transmitting radio frequency waveforms and observing the reflected received waveform from the target to estimate the properties of the target such as distance, speed, and angular location of the target.
Data Source
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AI summary
A method and apparatus for selecting frequency modulated continuous wave waveform parameters for multiple radar coexistence by a user equipment is described. The user equipment may transmit a radar waveform consisting of a number of chirps, with each chirp having a same duration. The user equipment may vary waveform parameters of the radar waveform for at least a subset of the number of chirps, where the waveform parameters may be chosen from a codebook comprising at least one codeword of parameters. Reflected radar waveforms are received and processed where the processing includes applying a fast time discrete Fourier transform to reflected radar waveforms to produce a one dimension peak in a time delay dimension for each reflected waveform; and applying a slow time discrete Fourier transform to the reflected radar waveforms, where peaks for the reflected waveforms are added.