FMCW Radar Leakage Signal Mitigation via Phase Noise Concentration
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Solution Overview
Problem
FMCW radar systems face a significant challenge with leakage signals that increase the noise floor across the frequency domain, degrading the signal-to-noise ratio (SNR) due to phase noise, and existing methods require additional components or strategic frequency planning.
Innovation Solution
The method involves generating in-phase and quadrature signals, creating a complex signal, concentrating phase noise on a stationary point using the SPC technique, and mitigating it through digital signal processing, including DC removal, FFT, and down-conversion, without the need for oversampling or strategic frequency planning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large closed loop with splitting coupler and synthesizing coupler is configured to compensate leakage signal, then the leakage signal is mitigated, but the device complexity and additional costs increase
Solution Approach 1:
The patent extracts and processes the leakage signal separately through digital signal processing. The leakage signal is identified in the frequency domain and its phase noise is concentrated on stationary points, then mitigated through digital compensation without requiring physical isolation components in the RF path.
Solution Approach 2:
The patent replaces the mechanical/analog approach (physical closed loop with couplers) with a digital signal processing approach. Instead of using hardware components to compensate leakage, the system uses digital algorithms to identify, analyze, and mitigate leakage signals in the processed domain.
2Measurement precision
If stationary point concentration technique is applied to concentrate phase noise on stationary point, then the noise floor is reduced and SNR is improved, but strategic frequency planning and oversampling are required
Solution Approach 1:
The patent changes the processing approach by working in the frequency domain and identifying stationary points where phase noise concentrates. By analyzing the spectral characteristics and locating these stationary points, the system can针对性地 mitigate phase noise without requiring oversampling or complex frequency planning, as the concentration effect occurs naturally in the spectral domain.
3Measurement precision
If traditional SPC technique is used with oversampling, then phase noise is concentrated on stationary point, but the maximum unambiguous range is limited
Solution Approach 1:
The patent applies partial processing by focusing only on the stationary points where phase noise concentrates, rather than processing the entire frequency spectrum uniformly. This selective approach to mitigating phase noise at specific stationary points allows for extended unambiguous range while maintaining the benefits of phase noise concentration, as it doesn't require the excessive sampling rates needed for traditional SPC.
Data Source
AI summary
A method for mitigating a leakage signal in an FMCW radar and a radar system thereof are disclosed. The method for mitigating the leakage signal in the radar system includes generating an in-phase signal and a quadrature signal for a beat signal, generating a complex signal using the in-phase signal and the quadrature signal, concentrating a phase noise of the leakage signal included in the complex signal on a stationary point, and mitigating the phase noise based on stationary point concentration (SPC) of the phase noise.