Radar I/Q Signal Processing for Pause-Free Noise Suppression
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Solution Overview
Problem
Conventional radar devices require a radar signal pause period to suppress electromagnetic noise interference, which disrupts continuous operation.
Innovation Solution
A radar device employing an FMCW or fast chirp system with a signal processor that generates complex digital data using I-axis and Q-axis local oscillator signals, performs FFT, and calculates cancellation constants to suppress electromagnetic noise without a radar radiation pause period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a radar signal pause period is provided to suppress electromagnetic noise interference, then noise suppression is improved, but continuous operation is disrupted and productivity decreases
Solution Approach 1:
The patent segments the radar signal processing into multiple parallel paths: a main path for target detection and a separate path for noise observation. The noise observation path uses a dedicated antenna element and signal processing chain that operates independently, allowing noise suppression without interrupting the main radar transmission. This segmentation enables simultaneous noise suppression and continuous operation.
Solution Approach 2:
The patent introduces an intermediary noise observation channel that acts as a mediator between the radar system and electromagnetic noise. This channel includes a dedicated antenna element and signal processing path that captures noise characteristics without interfering with the main radar signal transmission. The intermediary path allows the system to observe and suppress noise while maintaining continuous radar operation.
2Measurement precision
If a radar signal pause period is provided to observe electromagnetic noise, then noise observation accuracy is improved, but measurement time increases
Solution Approach 1:
The patent performs preliminary noise observation during the radar transmission period rather than after. The noise observation channel continuously captures noise characteristics in parallel with the radar signal transmission, eliminating the need for post-transmission pause periods. This preliminary action allows noise data to be collected during useful transmission time, avoiding time loss.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining parallel noise observation during the entire radar transmission period. The noise observation channel operates continuously alongside the radar signal transmission, capturing noise data without requiring interruptions or pause periods. This continuous observation maximizes the utilization of transmission time for both target detection and noise characterization.
3Object-affected harmful factors
If conventional noise suppression methods are used, then noise reduction is achieved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies local quality by dedicating specific antenna elements and signal processing resources solely to noise observation. Rather than treating all signal paths uniformly, the system identifies and isolates the noise observation function in specific locations (dedicated antenna elements and processing chains). This localized approach simplifies the overall architecture by assigning specific functions to specific components, reducing the complexity burden on the main radar processing system.
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 device effectively suppresses electromagnetic noise interference without requiring a radar signal pause, ensuring continuous operation and accurate target detection.
Implementation Method 1
mix the I-axis local oscillator signal and a received signal to generate an I-axis beat signal, and mix the Q-axis local oscillator signal and the received signal to generate a Q-axis beat signal
Implementation Method 2
performs FFT on the complex digital data, and measures a range and a Doppler velocity of an observation target
Implementation Method 3
a transmission antenna that transmits a radar signal, and a reception antenna that receives a reflected wave of the radar signal
Implementation Method 4
calculate a cancellation constant for canceling a component caused by electromagnetic noise per range bin
Data Source
AI summary
A radar device includes: a beat signal generation unit to generate an I-axis local oscillator signal and a Q-axis local oscillator signal from a local oscillator signal that is a real signal, mix the I-axis local oscillator signal and a received signal to generate an I-axis beat signal, and mix the Q-axis local oscillator signal and the received signal to generate a Q-axis beat signal; and a signal processing unit to perform signal processing on I-axis digital data and Q-axis digital data obtained by sampling the I-axis beat signal and the Q-axis beat signal, and the signal processing unit generates complex digital data from the I-axis digital data and the Q-axis digital data, performs two-dimensional FFT on the complex digital data, and measures a range and a Doppler velocity of an observation target on the basis of a property that an analytic signal does not have a negative frequency component.