Doppler Radar Interference Suppression Using Reference and Main Signals
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Solution Overview
Problem
Doppler radar detection technology is hindered by external interference such as co-channel interference, aliased adjacent-channel interference, and baseband/IF-band interference, particularly from objects emitting signals similar to Doppler signals, which complicates motion detection.
Innovation Solution
A radar detector system that includes a radar transmitting device, a radar receiving device, an analog-to-digital converter, and a digital processing unit, which detects interference components by transmitting and receiving radar wave signals differently to generate reference and main signals, allowing for the deduction of interference parameters to suppress interference in the received signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Doppler radar detection is performed in environments with external interference sources, then motion detection capability is maintained, but detection accuracy deteriorates due to co-channel interference, aliased adjacent-channel interference, and baseband/IF-band interference from objects emitting similar signals
Solution Approach 1:
The patent segments the received signal into multiple frequency components through FFT processing, allowing separate identification and suppression of interference signals at specific frequency bins while preserving the Doppler signal components. This frequency-domain segmentation enables selective interference removal without affecting overall motion detection capability.
Solution Approach 2:
The patent extracts interference components from the received signal by identifying characteristic frequency patterns and spectral features that distinguish interference from legitimate Doppler signals. Once extracted, these interference components are removed through spectral subtraction or filtering operations, thereby improving detection accuracy while maintaining reliability.
2Measurement precision
If traditional interference filtering methods are applied to remove interference components, then detection accuracy improves, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent replaces complex hardware-based interference cancellation systems with software-based digital signal processing algorithms. By using FFT-based frequency domain analysis and digital filtering, the system achieves effective interference suppression without requiring additional physical components or complex hardware architectures, thereby improving accuracy while controlling complexity.
3Reliability
If continuous radar wave transmission is maintained for accurate motion detection, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic radar wave transmission with alternating active and idle periods. During active periods, radar waves are transmitted for motion detection; during idle periods, transmission is suspended to reduce power consumption. The system uses the received signals during active periods to identify and suppress interference, maintaining detection reliability while reducing average power consumption through this periodic operation mode.
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
Effectively reduces or eliminates interference in Doppler radar motion detection, enhancing the accuracy of motion detection while minimizing power consumption and increasing antenna gain.
Implementation Method 1
Doppler radar detection technology is widely applied in motion detection for vehicle proximity detection
Data Source
AI summary
A radar detector including a radar transmitting device, a radar receiving device, an analog-to-digital converter (ADC), and a digital processing unit, and an interference suppression method using the radar detector are provided. The radar transmitting device transmits a first wireless signal. The radar receiving device receives a second wireless signal to generate an analog reference signal in response to the first wireless signal is subdued from being transmitted, and receives a third wireless signal to generate an analog main signal in response to the first wireless signal is not subdued from being transmitted. The ADC generates a digital reference signal according to the analog reference signal, and generates a digital main signal according to the analog main signal. The digital processing unit adjusts the digital or analog main signal according to the digital reference signal to correspondingly suppress interference components in the digital main signal or in the analog main signal.