Doppler Signal Processing for Interference Suppression
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Solution Overview
Problem
Radar devices face significant challenges in accurately detecting objects due to high background interference, which current signal energy threshold and frequency energy detection methods fail to adequately address, resulting in incorrect detection results.
Innovation Solution
A Doppler signal processing device comprising a frequency analyzer, interference suppressor, and synthesizer that generates a frequency domain signal, suppresses interference energy, and produces an interference-suppressed digital signal by estimating and updating the frequency domain interference signal based on energy distribution, effectively reducing background interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal energy threshold device or frequency energy detection method is used to reduce background interference impact, then detection reliability is improved, but measurement precision deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into multiple frequency bins and processes each bin independently through spectral subtraction. By dividing the frequency domain signal into discrete bins and applying interference suppression to each bin separately, the system achieves both reliable interference reduction and maintains precision in detecting actual targets within specific frequency ranges.
Solution Approach 2:
The patent changes the parameter of interference estimation by using adaptive spectral subtraction with adjustable subtraction factors. The system dynamically adjusts the spectral subtraction parameter based on estimated interference levels, allowing it to reliably suppress interference while preserving target signals and maintaining detection precision through optimized parameter selection.
2Device complexity
If conventional frequency energy detection method is used, then device complexity is reduced, but detection precision deteriorates due to incorrect detection results
Solution Approach 1:
The patent performs preliminary interference estimation and spectral subtraction in the frequency domain before final target detection. By pre-processing the signal to estimate and remove interference components before making detection decisions, the system achieves high detection precision without requiring overly complex hardware, as the interference suppression is performed through efficient frequency domain operations.
Solution Approach 2:
The patent introduces an intermediary frequency domain representation as a mediator between the raw time domain signal and the final detection result. By transforming the signal to the frequency domain, applying spectral subtraction as an intermediary processing step, and then transforming back, the system achieves precise detection with manageable complexity through the mediating frequency domain representation.
Data Source
AI summary
The Doppler signal processing device includes a frequency analyzer, an interference suppressor, an interference baseline estimator and a synthesizer. The frequency analyzer can generate a frequency domain signal according to a digital signal. The interference suppressor can perform a suppression operation to generate an interference suppressed frequency domain signal. The interference baseline estimator can generate or update the frequency domain interference estimation signal according to the frequency domain signal. The synthesizer can generate an interference suppressed digital signal according to the interference suppressed frequency domain signal, where the interference suppressed digital signal is related to the digital signal with the interference energy suppressed.