Radar Interference Wave Suppression via Frequency Modulation Analysis
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Solution Overview
Problem
Radar apparatuses installed in vehicles face challenges in accurately detecting targets due to interference waves from other vehicles, which degrade the Signal to Noise Ratio (SNR) of reception beat signals and deteriorate detection performance.
Innovation Solution
A radar apparatus equipped with a transceiver that outputs frequency-modulated transmission waves and an interference wave suppression device, capable of separating and suppressing noise signals from interference waves received along with reflected waves, using a Micro Control Unit (MCU) with specific signal processing components like quadrature MIXers and a DC component suppressor to isolate and remove the interference wave signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radar apparatus receives both reflected waves and interference waves, then the reception signal contains both useful and harmful components, but the Signal to Noise Ratio (SNR) of the reception beat signal deteriorates due to the superimposition of noise signals from interference waves
Solution Approach 1:
The interference wave suppression device extracts and removes the interference wave component from the reception signal. By identifying the interference wave as a distinct signal component with different frequency modulation characteristics, the device separates and eliminates this harmful element, leaving only the useful reflected wave signal for target detection.
Solution Approach 2:
The device converts the harmful interference wave into a beneficial suppression signal. By analyzing the frequency modulation characteristics of the interference wave and generating a corresponding suppression signal, the system transforms the harmful interference into a controlled process that eliminates the interference while preserving the useful signal.
2Productivity
If signal processing is performed with noise signals superimposed on reception beat signals, then the radar can operate continuously, but the detection accuracy deteriorates due to reduced SNR
Solution Approach 1:
The interference wave suppression device operates with feedback from the reception signal to continuously identify and suppress interference waves. By monitoring the frequency modulation characteristics and adjusting the suppression signal accordingly, the system maintains continuous operation while dynamically improving detection accuracy through real-time interference removal.
3Device complexity
If the radar apparatus uses frequency-modulated transmission waves, then the circuit configuration remains simple and signal processing is easy, but the radar cannot distinguish between reflected waves and interference waves with the same frequency modulation mode
Solution Approach 1:
The device applies local quality analysis by examining the frequency modulation characteristics at different time intervals. By comparing the instantaneous frequency and its rate of change within specific time windows, the system identifies local differences between reflected waves and interference waves, enabling differentiation without complex circuitry.
Solution Approach 2:
The interference wave suppression device dynamically adjusts the frequency modulation analysis based on real-time signal characteristics. By continuously monitoring and adapting to changing frequency patterns, the system can distinguish between reflected waves and interference waves even when they share similar overall modulation modes, maintaining simple hardware while achieving sophisticated signal differentiation.
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 radar apparatus effectively suppresses interference waves, improving the SNR of reception beat signals and enabling stable and accurate target detection.
Implementation Method 1
a transceiver to output a transmission wave that is frequency-modulated, and to receive a reflected wave propagated by reflection of the transmission wave from a target
Implementation Method 2
the interference wave being a radio wave other than the reflected wave and being frequency-modulated in a mode different from a mode of the transmission wave
Data Source
AI summary
A radar apparatus includes a transceiver and an interference wave suppression device. The transceiver outputs a transmission wave that is frequency-modulated. The transceiver receives a reflected wave propagated by reflection of the transmission wave from a target, and outputs a reception signal. The interference wave suppression device separates, when an interference wave is received together with the reflected wave, a noise signal derived from the interference wave from the reception signal and suppresses the noise signal, the interference wave being a radio wave other than the reflected wave and being frequency-modulated in a mode different from a mode of the transmission wave.